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Old 12-26-2009, 10:32 PM   #1 (permalink)
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Pressure in TH400 Oil cooler Line

Like the title says, if I install a pressure gage in the oil cooler line, what should I see for a good pressure in a GM Turbo Hydro 400 transmission??









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Old 12-26-2009, 10:42 PM   #2 (permalink)
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Quote:
Originally Posted by Blown7 View Post
Like the title says, if I install a pressure gage in the oil cooler line, what should I see for a good pressure in a GM Turbo Hydro 400 transmission??

When? Idling, in gear? in park?? here's the factory spec:

neutral, brakes applied, 1k rpm: 55-70 psi
D, idle (idle "set to spec"): 60-85
D, brakes applied, 1k rpm: 60-90
Intermediate or lo, brakes
applied, engine at 1k rpm: 135-160
R, brakes applied, 1k rpm: 95-150
D, brakes applied, 1k rpm,
downshift switch activated: 90-110


this is for the oil pressure gauge mounted on the test port on the driver's side of the case. Hope it helps. *shrug*
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Old 12-26-2009, 11:31 PM   #3 (permalink)
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when I was deciding on what size lines to run to my cooler I was looking for the GPM. never did find the data I was looking for an went with a -8 line since the largest fitting with out a step is a 1/4 NTP to -8
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Old 12-26-2009, 11:36 PM   #4 (permalink)
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OOPS

I was thinking "what are good line pressures", not what kind of pressure you actually asked about. Sorry... I'll go get the bleach.
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Old 12-27-2009, 10:21 AM   #5 (permalink)
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Th-400's have a small flaw they build pressure when cold mainly due to the size of the cooler line and the fact they do not have a cooler by-pass like the th-350 built in to the pump , so warming them up is criticle other wise they build pressure and force the converter into the back of the crank and eat the bottom end of the motor . Like Camo said a 8 is a good size . And look for possibly a Wagoneer fitting there huge compared to the stock gm version- Jess
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Old 12-27-2009, 11:21 AM   #6 (permalink)
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I dont think that you'll see much Cooler line pressure over 10 Psi, and more like 5 psi when warm. Cooler line pressure is NOT the same as Line (regulated pump) pressure.

Kiwi
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Old 12-27-2009, 12:29 PM   #7 (permalink)
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http://www.jakesperformance.com/TH400_Rebuild_Tech.html If you have any other ques. I would ask this guy. Very helpfull.
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Old 12-28-2009, 08:58 AM   #8 (permalink)
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Quote:
Originally Posted by tacoma73 View Post
When? Idling, in gear? in park?? here's the factory spec:

neutral, brakes applied, 1k rpm: 55-70 psi
D, idle (idle "set to spec"): 60-85
D, brakes applied, 1k rpm: 60-90
Intermediate or lo, brakes
applied, engine at 1k rpm: 135-160
R, brakes applied, 1k rpm: 95-150
D, brakes applied, 1k rpm,
downshift switch activated: 90-110


this is for the oil pressure gauge mounted on the test port on the driver's side of the case. Hope it helps. *shrug*
Yea the manual has that info also but Thanks!

Quote:
Originally Posted by camo View Post
when I was deciding on what size lines to run to my cooler I was looking for the GPM. never did find the data I was looking for an went with a -8 line since the largest fitting with out a step is a 1/4 NTP to -8
I used -6 braided lines to the cooler

Quote:
Originally Posted by tacoma73 View Post
OOPS

I was thinking "what are good line pressures", not what kind of pressure you actually asked about. Sorry... I'll go get the bleach.
No need.

Quote:
Originally Posted by Kiwipushrod View Post
I dont think that you'll see much Cooler line pressure over 10 Psi, and more like 5 psi when warm. Cooler line pressure is NOT the same as Line (regulated pump) pressure.

Kiwi
Now thats interesting as I see about 15-20 cold and then it drops to about 5 PSI warm.

Thats why I asked

Thanks ALL
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Last edited by Blown7; 12-28-2009 at 08:58 AM.
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