View Turbo 350 (TH350) transmission cooler line diagrams and cooler flow path that route to the radiator and to an external transmission cooler. Powerglide - Dedenbear. Included are details of the desirable factory part. #7. Our Price: $83. A hydraulic pump is capable of making tremendous amounts of oil pressure. . 95. Material: Stainless Steel. Also fits Transmissions w/ 1/4 in. All you have to do is crack open a line and crank over the engine. I have seen it numerous times both on the track and the street. Gravity will return ATF to bottom port of Rad. This 4l60e transmission cooler lines diagram provides an easy to follow example of how your 4l60e’s cooling path works. Accessories and Parts. Get the Best Performance with JEGS Transmission Oil Cooler Lines for 1967-1970 Chevy C10/C20, GMC C1500/C2500 w/Turbo-Hydramatic 350/400 Trans. Based around the 4L80E (and fitting wherever a 4L80E will fit), the 6X is a true six-speed transmission that TCI rates at 850-plus horsepower. 10 Diagram Th350 Cooler Lines In And Out Luceeinayat Chevy 350 with a th350 transmission. Transmission Cooler Line Frame Bracket $10. Place the hose in the GE-47716-2 Graduated2766 posts · Joined 2014. Oil Industry Process Flow. Lower ¼" Pipe Cooler feed/out. TH350 Pressure and Return Lines? Hey all - OK - I'm being kinda lazy on this one. Apparently the line with adapters and hose clamp bolt heads were beating against the radiator, eventually wearing a hole in it. * Means extra charge will be $20. Hayden's Transaver coolers are designed for the Transmission Repair Specialist but can be installed. 0. For those of you who have swapped a 2004r in your 1969, did you "tweak" T350 lines, make your own, use BTO Lines Made E-Z, or braided. Automatic Transmission Cooler Lines, 7 Ft. Whether you replace the torque converter or not, excessive wear, scoring, or other damage. ($30) Ebay: B&M Super Cooler tranny cooler ($40) Total parts cost= Approx. if your trans has the fac. Born 283 / PG / A51. No "H"es, no valves, just route it your way down south and my way up north and all is good. PART NUMBER: TRA-42. Web Lower line out of TH350 to the lower radiator trans cooler fitting. I have done this very swap on my 69 camaro. Item #: OCL006. Rear ¼" Pipe Return/in. INSTALLATION INSTRUCTIONS TRANSMISSION COOLER PART 13101. Material: Steel. $135. Ecsb 4wd. This item 6AN 70" Transmission Fluid Oil Cooler Hose Line kit for GM Chevy Transmission 4L80E TH350 TH400 4L60E 700R4 200-4R TR6060 Ford AOD 4R100 4R70W and C5 Stainless Steel Braided PTFE Hose Sineside AN6 Flexible Transmission Cooler Lines and Fittings, 2Pcs 7FT PTFE Lined Braided Stainless Steel and Nylon Hose, Replace 700R4/4L60 /TH350. Estimated Ship Date: Nov 27, 2023 if ordered today. These pressure readings provide a valuable source of information when. Here's the list of GM transmissions and their in/out line sizes and flow direction. By 201fireman January 27 2018 in Drivetrain Tech. This pertains to a powerglide, but I assume it would be the same for a th-350. Dorman Automatic Transmission Cooler Lines 624-051. MoparPartsGiant. Make sure you verify your transmissio… $56. #4 · Mar 16, 2008. 8 out of 5 stars 10 Diagram Th350 Cooler Lines In And Out Luceeinayat. This is because the transmission lengths are the same and the positioning of the cross member can be easily modified, you only need to change the transmission mount, add transmission cooler lines, and update the shift indicator to a Turbo 350 pattern to complete the. Small Block V8 and Long Fuel Pump Only. 427sleeper and Pops @ Tri-5. JEGS 113601K Part Number: 555-113601K. This TH350 is in need of a MAJOR REBUILD! Also a lesson on transmission additive and what it does. [Stainless Steel] Part Number: 555-13221. Th350 Valve Body Diagram - Wiring Diagram. Web Diagram Th350 Cooler Lines In And Out Thread. TH-350C Bands. Thanks for the replies, but my question was more about which way the factory cooling lines get installed in the car. Designfilters - cooler 0904-000 filter: oil sportpac (2 required) 0905-000 filter: oil enpac 0440-001 cooler: engine oil 5 x 1-1/4” 0440-549g3 cooler: dual engine/gear 0520-000 kit: oil bypass (includes bypass, o-ring, & fittings) 0520-001 bypass: oil sb 0520-002 o-ring: bypass cover 0000-871 fitting: oil bypass (2) 0901-350 bracket: dual oil sb. 1980 - 1981 Firebird and Trans Am TH-350 Transmission Modulator Vacuum Line for Pontiac 301 NON-Turbo Engine, Original Steel. 1. STEP 2 After placing the transmission in your work area, remove the torque converter unit. org on 2022-01-08 by guest builder and technical writer David Vizard turns his attention to extracting serious horsepower from small-block Chevy engines while doing it on a budget. In order to remove any debris left in the system from the previous transmission, B&M recommends that you a) hot flush and flow check. Hello all. Replacement Cooper Washers - AF59-3750. An Eckler's PDF that shows a TH350 installation has poor quality images but it looks like the transmission lines go through or behind the motor mounts. the dipstick is made from two different. TH350 Turbo 350 Same also holds true with the oil pump. You will need to determine which line is the return for the transmission. Wiring Diagrams. i dont believe in cross threading stuff, but some people do, save enough to replace the cracked trans case. Outer line furthest from converter: Web find fluid cooler lines th350 transmission model and get free shipping on orders over $109 at summit racing! 1970 315hp/410ftlb buick 350 code sp stock w/ 800cfm qjet and crower level 3 cam (rip) and th350 #2 (rip). GM Transmission Cooler Fittings. Order Chevrolet Impala Auto Trans Oil Cooler Line Fitting online today. $24. If you had it reversed, the pump would be. Basically bottom to bottom and top to top in theory. Port Spacing [Stainless Steel] (0) $49. Are your transmission cooler lines leaking? This video is here to help you perform a quick, easy, and dirty repair to STOP them from leaking. 454, TH400, NP205, 6" Susp Lift,. tor and shifter cable. 95 $ 69. Web automatic transmission cooler lines, 7 foot length, flexible, braided stainless steel, ptfe, 4l60, 700r4, th350, th400, pair. The reason Ford has it entering the top of the radiator mounted cooler is because it will help the coolant flow through the system. Ad But Did You Check eBay. What you need to know about GM Chevy transmission cooler line removal. Accessories and Parts. Transmission Vacuum Line, Steel, Pontiac, TH400, Each. 4) Red Eagle Frictions. A worn or seal and lead to. Engine: 6 Cyl 5. Brand. Usually I will only cut one side of the tubing and then I only have one side to flare. Sheet Metal. Part Number: SUM-230321 4. T 350 cooler lines Hot Rod Forum Hotrodders. The TH400 is an aluminum cased three speed automatic transmission that was produced by GM. I removed & eliminated the hard lines (they broke), instead of putting new hard lines back (PTA) 😂. Sold as a 2 piece set, both are 5/16" in diameter. Cooling lines on turbo which is oil out, thus the fluid goes thru the trans cooler first then the aux cooler last. Polished. Online I found this routin diagram, a more simple application. 07. It’s a very tough unit. Brand New. 2 Line set with 1/2" fitting at radiator. Have someone watch it. Kind of confused on cooler line routing. The top line is return/in, it doesn't have suction so. TH350 straight fitting (NPS) to trans case is 25 ft/lb, tapered (NPT) is 15 ft/lb. Fits ST300, TH350 & TH400. Turbo 350 transmission cooler line diagram. If you get a 3/4" thick unit it will not interfere with an open hood in the front. These have a straight thread and seal on the gasket. In this video we'll be installing a new Trick Flow aluminum deep transmission pan on my turbo 350 transmission along with a Lubelocker pan gasket, filter, an. 1964-1977 Chevy El Camino Transmission Cooler Hose Kit. A worn or seal and lead to. The TH350 takes about 4 quarts in the pan, and then requires additional based on the torque converter being used. I really need to monitor trans oil temperature in some races and i would like to fit a sensor (the best would be 1/8 NPT thread) somewhere into the transmission or at the beginning of the oil line to the cooler. tor and shifter cable. The Same Top To Top, Bottom. $37. 160032A 2008 F-150, Mark LT 4X2 4. Part Number: SUM-230321 4. 38+ diagram th350 cooler lines in and out Sabtu, 18 Februari 2023 Edit. TH350 cooler flow; Welcome to Club Hot Rod! The premier site for everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more. Bottom. DesignPhase 2: Removing Old Lines *NOTE* Make notice of the cooler lines' proper fittings on the transmission as well as the way they are routed. 1 - 2 of 2 Posts. The aux cooler should be mounted in such a fashion as to not trap air. • transmission cooler lines • gear selector linkage • throttle (or kickdown) wiring, cables or linkage • speedometer cableBut to use an aluminum line that is designed as a carburated application fuel line for trans cooler line is asking for trouble. which causes all the fuild to drain out it i,f it sits for very long. The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain: Trans Cooler Lines TH350Find 1970 CHEVROLET CHEVELLE Fluid Cooler Lines and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase. The TH350 Cooling Line Diagram is a visual representation of the cooling system in the TH350 automatic transmission. Some fluid will still be trapped under the valve body, under the accumulators, and in the case oil passages. If you remove a line from the radiator and fluid can be pumped into a bucket from the line, that is the inlet line to the radiator (the hot trans fluid). Vehicle Type. Save Share. Material: Steel. The Turbo 700R4 transmission has taken the conversion world by storm and is a good option for the same reasons as the TH350, with advantages in having both a lower first gear and a . 71 1/2 & 3/4 Ton truck 4 wheel drive transmission cooler lines for TH350 or TH400 manufactured in stainless steel. tranny cooler lines backwards The 1967 - 1972 Chevrolet & GMC Pickups Message Board. There are only a few lines that you need to worry about. The 200-4R is a 4-speed automatic overdrive transmission by GM, capable of fitting into most Chevy’s from the 80s and before, built similarly to the TH200 and TH350, as well as the 2-speed Powerglide. Drain transmission fluid from pan, and. My trans book says the th350 upper fitting is the return line. Top. Replacement Oil Cooler Lines on Amazon - 39660 1/2" x 3/8" Transmission Oil Cooler Line Scissor on Amazon - GM Customer Satisfaction Program number: N212326940. seeing the corrolation of my personal S15 with 350 and 700R4 your outlet temps are comparable to mine. Get the vehicle up in the air with the use of either a jack and jack stands or ramps. The transmission cooling line system is vital to any automatic transmission. Oversize $9. 0. It circulates the hot fluid away to the radiator via cooler lines and returns the cooled fluid back to the transmission. , it is very important to determine the send line and which line is the return line on a 4l60e transmission (inlet and outlet). The 4L80E transmission is the advanced progeny of the legendary TurboHydramatic TH400 automatic transmission, and is based heavily on the 400 in both parts and strength, yet featuring an added overdrive gear, a lock-up torque converter and advanced electronic controls. The TH350 has been around since the early '60s. Clean the tube and make sure it isn't cracked at the indent (common). All lines are formed utilizing the correct automotive grade, OE or stainless steel tubing and includes the correct style flares, fittings and protective wrap, installed on the linline to the transmission case. 1962-1979 Chevy Nova Transmission Cooler Hose Kit. 4L80E (1991-1996) Fitting Location Thread Size Flow Direction. Top. is there any definate answer, if is is the upper or lower is the return line, it is critical for me to now, because i need to put a one-way valve in the return line,since the check-valve in the pump quit working . A loss of fluid leading to an overheated transmission can be devastating as the system loses its ability to cool. When combined with a 9. From the upper rad cooler fitting run a line to the aux cooler. com. I believe this helps to force any trapped air out of the trans cooling system. It is a 355 with around 400hp and a. Or email us using our CONTACT link above. Buy 1968-1982 Corvette Transmission Cooler & Lines online at Zip. If you “hit the bull’s eye” and the problem is eliminated, track down your restriction. th350 cooler line pressure the cooler line pressure on a th350 transmission is typically set between 40 and 50 psi. This diagram should get you through it. Derale. Lockup converter torque wiring diagram computer 700r4 lock without gm transmission switch r4 chevy valve turbo body engine rod th350Diagram transmission cooler th350 ford cooling schematic wiring 700r4 derale installation aluminum duty lock chart e4od coated pan powder finish. (245 reviews) Code: D13035. Transmission bottom to radiator top. 4sp w/GV, AC,PS,3. Register or Log In To remove these advertisements. Automatic Transmission Cooler Lines, 7 Foot Length, Flexible, Braided Stainless Steel, PTFE, 4L60, 700R4, TH350, TH400, Pair. Suits GM TH350 & TH400 gearboxes, easily plumb your Transmission Cooler with AN lines and fittings. Flatdog, Mar 19, 2006. TH-350C Case. NPT Threads on Case; Includes: Black Fittings; Stainless Steel Braided Hose; View Details. Bottom port on the trans is the pressure side. The vacuum line diagram for the turbo 350 transmission is pretty simple. 70 (1) Ships Today Lowest Price Guarantee. The turbo350 uses two brass fittings for the steel cooler lines to screw into. nvaccess. 10 Diagram Th350 Cooler Lines In And Out Luceeinayat There are pre bent transmission cooling lines made, but since this is't a factory car you're dealing with, some modification would most likely be required (shortening lengthening); it would depend on how your radiator is mounted compared to a stock one (forward backward). #5 · sep 27, 2012. Lower ⅛" Pipe Cooler feed/out. Fitting Location Thread Size Flow Direction. 167. Fitting Location Thread Size Flow Direction. The way @baldilocks explains it the cooling goes: Hot oil from the transmission to the passenger side bottom radiator. Th350 Transmission Valve Body Diagram. Diagram Turbo 350' 'This is an old draft of some TH400 oil pump technical May. #2 · Sep 27, 2012. These exact reproductions come in pairs. Estimated delivery Nov. Adapter into the upper transmission oil cooler line port of the transmission oil cooler. The two brass fittings will have a NTP thread size. An extra trans cooler. We use ni copp for the lines. Recently Viewed. I noticed that after a little over a gallon I got air bubbles. Thats how I remember the Turbo 350 Trans lines. Add To Cart. i tried a new rubber o ring still leaks. Add To Cart. Enjoy!silicone s. Verify the ends thread into your cooler. 2. 70 more than 10 available lowest price guarantee automatic transmission cooler line kit gm th350 th400 700r4 also fits transmissions w 1 4 in. now 427. Technical routing lines from TH350 to radiator. net. Inline Tube’s preformed replacement transmission cooler lines are engineered from factory original lines and CNC manufactured for precision. Transmission Oil Coolers. I forgot how the lines went. Process flow diagram Typical oil refinery Crude oil. I am in the middle of a thrash to get my car running before the end of July and man, the nice stainless hard lines I bought for a 350 look like. [DIAGRAM] Chevy Turbo 350 Transmission Diagram FULL Version HD Quality from eteachingplus. 5/16 lines, you can also use flare to AN. TH350 rebuild tech Crankshaft Coalition Wiki. Page 2 of 2 < Prev 1 2. The Bottom line is the Feed/Out which has pressure. Once the trans is in place and the driveshaft is installed, there are still a few details to overcome. I plan to go with hard lines and wondering the best routing configuration to keep it looking clean. Allowing for easy identification of any potential. (top or bottom on tranny) Ag. Th350 Cooler Lines Diagram 3 3 marked↵ a milestone in automotive history. A worn-out TV cable or a faulty adjustment is another common issue on the 700r4 transmission. Clean out pan. This reduces the heat being introduced to the radiator, which is usually. Transmission Oil Cooler Lines for 1970-1972 Chevrolet Nova w/TH350/400 Trans. Jun 5, 2023 - Explore Alessandra asil's board "TH350 Transmission" on Pinterest. Does anyone have pictures of their trans cooler lines from a TH350 or TH400My Nova is a 1970. o The upper transmission coolant line on the TH-350C transmission is the return side (cooled fluid returning from the radiator). installed new 1406/2101. TH 350 cooler line oil flow Hot Rod Forum Hotrodders. 8) Removed center seal from direct clutch hub. 1-813-628-0092. By using an electric gauge with a switch and three senders I can monitor feed out to the cooler, cooler return, and sump as I choose to. 4 Wheel Drive 8 Cylinder 67-72: 1: $79. 8 Hrs. 5/16 lines, you can also use flare to AN fittings into the brass adapters (usually. The Moroso line that you recommend is stricly a low PSI high volume seamless line (minimum line pressure of a t-350 is 55 psi). 1. SELECT STORE. - 8 in. 4 Wheel Drive 8 Cylinder 67-72. Th350 Transmission Parts Diagram. Then the bottom line goes back to the transmission with the cooler fluid. About valve body th350 diagram. More than 10 available. 2. Whether you replace the torque converter or not, excessive wear, scoring, or other damage. Fits 1968 – 1971 Buick A Body w/TH400. #2 · Oct 3, 2006. . Oldsmobile. Acemechanic. Web modern cars have a one way valve in the cooler lines. . 3. All TH350 builds now have a $450 core charge due to core shortages. My tranny cooler hook up with picsLoad wiring: 2002 chevy trailblazer transmission cooler lines diagram Trailblazer coolant chevrolet 2002 engine hose diagram recovery radiator rsvr coolChevrolet s10 transmission cooler lines. Without the vacuum line attached it will always shift like it is running at wot, even. Disclaimer: Under no circumstances will proclaimliberty2000 be responsible or liable in. The fittings for the trans cooler lines are in the same location on all three of these automatics, so the plumbing won't need to be modified. 375 posts · Joined 2006. TH350 Pressure and Return Lines? Hey all - OK - I'm being kinda lazy on this one. 70 Gs. It was introduced for the 1965 model year and made its debut in Cadillacs, and is respected for its durability and adaptability. (OS1) $53. Part Number: RSD-CTC6703. Fitting Location - Flow Direction. My sump temps when the output monitor is showing 220 is 170. All Dash; Top of Dash Panels; Windshield Repair Panels; View All; Doors. T 350 cooler lines Hot Rod Forum Hotrodders. Register or Log In To remove these advertisements. Everything is the same. JASPER also offers a full line of transfer cases for both 4 wheel drive and all wheel drive applications. Th350 lock up wiring diagram. Worth repeating: Modulator O-ring. Into the bottom of the transmission cooler. COOLER RETURN LINE CHART. expert reply by: Jameson C. Stage 1 TH350 – 500+ HP/TQ. 25 th350 valve body diagramTh350 vacuum line. What. Related Items. 0122, 7am-10pm, everyday. blogspot. Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20. Malibu w/TH350 Trans. Web th350 transmission parts,th350 transmission rebuild kits,sonnax transmission parts. 31 Posi,ft disc,11" r drum. The lower line from the TH350, 400, or powerglide tranny is out. Opens in a new window or tab. Automatic Transmission Cooler Lines, Steel, Chevy, TH350, Pair. The TH350-C was the lockup torque converter version introduced in. lbs. If you're running an external cooler: tranny bottom to radiator top, radiator bottom to cooler top, cooler bottom to tranny top. Easy to use parts catalog. 7) Switched forward and direct piston release springs. Honda 2, 3 & 4 Speed . 1. As already mentioned, the flow direction of the transmission cooler is such that the top hose attachment is the hotline, and the bottom one is the cold line. The first line goes from the vacuum port on the transmission to the vacuum modulator. Weve got a great one right here that will help you get the job done quickly and. TH350 Cooler Lines The 1967 - 1972 Chevrolet & GMC Pickups Message Board. Providing a REBUILDABLE core will be a credit toward your build price. Does Consistent 10. Part Number: CST-CTT1003-OE. Discussion in 'Traditional Hot Rods' started by TBonez, Mar 20, 2017. When installing rubber cooler lines to metal lines always put a small flair at the end of the metal line. This enables the fluid to rise and push the air out of the rad cooler. The vacuum modulator, together with the governor, controls the shift points on the TH350 transmission. Description: Turbo 350 or 400 small block with radiator mounted in front of core support. (national pipe thread size. Now with TH350 #3 with TransGo 350-1-2 Shift Kit, 2500 stall Hughes Converter, GN 8. comSurface Studio vs iMac – Which Should You Pick? 5 Ways to Connect Wireless Headphones to TV. Part Number: RSD-FTV7801. 2 Wheel Drive 8 Cylinder 67-72: 1: $64. STEP 10: Install drive shaft (and torque arm if used). The below transmission cooler installation diagram shows the transmission fluid flow direction and how the fluid will be routed through a new external cooler. Designdoes anyone have pics or can explain the routing of the trans lines to the cooler. Turbo 350 Transmission Cooler Line Diagram. The 350th has the same routing as a 700R4. Web Summit Racing Flexible Automatic Transmission Cooler Lines SUM-230322-B. which one is the sender, and which is the return?This kit uses Fragola Made in the USA lines and fittings! Included in the kit are: (2) Transmission Oil Port Fittings w/ #6 AN male ends. It has a distinctive oil pan that is chamfered at the passenger side, rear corner. Need to replace all my Transmission lines because the previous owner cut them and replaced with basic tubing. Drain the fluid and pull the pan. Add to Cart. you can call ATI and get the proper fittings, 1/4-20 STRAIGHT to #6 or #8 AN. Because the transmission lengths are the same and the positioning of the crossmember can be easily modified, you need only change the transmission mount, add transmission cooler lines and change the shift indicator bezel to a TH350 shift pattern to complete the exchange. Easy way to find out is use a compressed air line on them both and see if one way flows and the other doesn't. in this thread in this sub-forum in the entire site. It is best to use a metal line for all but the connections at the modulator valve and if necessary at the intake manifold. 78 Malibu Classic factory 4 speed. TH180 . See full list on transmissioncar. A loss of fluid leading to an overheated transmission can be devastating as the system loses its ability to cool. PART NUMBER: TRA-2195. Here are the steps you need to take to change the transmission cooler lines on your Chevrolet Trailblazer : 1. Once all of the fasteners are installed, tighten the crossmember bolts first, and then tighten the bolts to the transmission rear. Surface Studio vs iMac – Which Should You Pick? 5 Ways to Connect Wireless Headphones to TV. Web if youre working on your chevy and need a transmission cooler lines diagram youre in luck. 1964-1983 El Camino Transmission Lines Parts. this pressure helps to keep the fluid temperature steady and also prevents damage to the internal components of the transmission due to extreme wear or heat. Optimal transmission temp is about. NPT Threads on Case. 2 3/4" hole. Car Problems & Safety. Fragola. I recommend using a high-capacity pan and a transmission cooler for performance-built transmissions. 700-R4 (4L60)/ 4L60E. The cooler core will flow in either direction, there is no specified inlet or outlet port. Hi got a few wires comming from the thm350c tranny in my chevy need to know how to wire this up to a switch. Joined: Oct 1, 2015 Posts: 7,590. 3's steel lines. When I installed the lines, I put the top cooling line from the. Part Number: SSH-OCL206S. Transmission Cooler Lines-Stainless Steel-2 Piece "A". The T-350 cooler line pressure runs 20 - 60 psi on a stock configured T-350. Remove the old lines and replace them with new ones. DesignTransmission Cooler Hose Lines Fittings Stainless Steel Braided Hose Fit for Chevy for Ford GM GMC Buick Cadillac Cars Replace 700R4 TH350 TH400 NP-700RTL 52 Length Fitment: For Chevy, for Ford, for GM & GMC, for Buick, and for Cadillac cars Package Included: 4 x AN-6 flared to 1/4" NPT billet adaptors, fits most 700R4, TH350,. 700r4 Cooling Lines Trans Cooler Team Chevelle View turbo 350 (th350) transmission cooler line diagrams and cooler flow path that route to the radiator and to an external transmission cooler. Cooper washers included. Make sure you verify your transmissio… $95. Stainless Braided Transmission Cooler Hose Line Kit Turbo 350 400 4L60E 700R4. 7K views 2 years ago Replacing the kinked and leaking steel transmission cooler lines with NiCopp lines. Worn-out TV cable/adjustment. burnout, Hayden Transaver Coolers are an integral part of extending the life of your transmission. 99 $37. Warning: Always use two wrenches when tightening the In-line Thermostat Fitting to the oil cooler; failure to use a back up wrench could cause damage to the cooler core. 99. It circulates the hot fluid away to the radiator via cooler lines and returns the cooled fluid back to the transmission. (top or bottom on tranny) Ag. Lower ¼ Pipe Cooler feedout. th350 cooler line pressure the cooler line pressure on a th350 transmission is typically set between 40 and 50 psi. This is an old draft of some TH400 oil pump technical. o The upper transmission coolant line on the TH-350C transmission is the return side (cooled fluid returning from the radiator). We have a great online selection at the lowest prices with Fast & Free shipping on many items!.