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Thread: Transmission line pressure
07-15-2010, 10:17 PM #1
Transmission line pressure
Does anyone know how much pressure is built up in the supply and return lines for a TH700r4? I may need to re-route a transmission cooler and need to know what kind of hose to get; really don't want to bend tubing. Will a rubber wire braided line work?
1989 R1500 Silverado Suburban
5.7L, TBI w/ Dual remote oil filters,
16" 2010 CFM E-fan, K&N filter
TH700R w/ Aluminum pan, remote trans fluid filter and aux trans fluid cooler
Air shocks rear,
7x16 dual axle cargo trailer; 10K Reese HD trunnion bar WDS, dual friction sway dampeners
Cuz....I like to move it, move it....
07-19-2010, 09:43 PM #2
11/32 transmission line from your local auto parts store. The most a street 700 will see is about 120#.1999 Chevy Silverado XC/SB Z71 - Comp Thumpr, Yellow LS6 Springs, 04 injectors, TR Pushrods, P&P Heads,Flexalite Fans, !Cats, !EGR, HPTuners, Thorleys, Dynomax Catback, Airaid, TCI 3000, Transgo w/ Vette Servo n Pinless Pistons, Tru-Cool, Helo 18x9 w/ 285/65/18 Nitto, Stainless Brake Lines, Hydroboost, Hawk pads, Ford Keys, exterior and interior mods, big stereo, less than 12,500 original miles.
2005 4wd Colorado (work truck)
07-20-2010, 06:16 PM #3
Thanks, jlwz71, & tbplus10
I just ran across this information on this sitewhile trying to google an answer: http://www.hotrodders.com/
Transmission fluid cooler lines: On the 700R4 the bottom fitting on the right side of the transmission is the "out" line to the cooler and the top fitting is for the return line from the cooler. These fittings are 1/4-inch pipe thread, and CAN include an adapter from the factory for threaded steel lines in an SAE size.
The transmission fluid pressure readings should be in the ranges of the following numbers (psi):
Last edited by BluBurb89; 07-20-2010 at 06:19 PM.
07-20-2010, 09:50 PM #4
If you have shift pressures that high (max) better wear a neck brace. That will bark the tires in second on that burb.
07-22-2010, 09:53 AM #5
Wasn't planning to race just doing some cross country towing; I'll leave the "neck brace" driving to more capable hands. As I indicated, I ran across the info on a racer site. I wanted to know what the tranny is and should be doing regarding heat and pressure. Planning to put in a B&M Transpak and was looking for all the info I could get before doing the work. I'd rather build in some safety knowing the operating ranges, than be stuck somewhere because I missed something. I expect to see pressures in the middle; nothing too harsh but not a lot of slippage. Not really into roadside repairs; if I can avoid it initially.
Thanks for the input.
07-24-2010, 10:24 PM #6
07-26-2010, 12:56 PM #7
All information and tips are appreciated; I hope you didn't think that I was getting "stiff necked" with you. I know little about transmissions and appreciated what you said about the hard shift, as I may have made a mistake in selecting the correct upgrade kit had your comment not been available to me.
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