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-   -   How much pressure in auto tranny cooler lines? (http://www.moparchat.com/forums/showthread.php?t=84680)

riquiscott 07-22-2004 11:34 PM

How much pressure in auto tranny cooler lines?
 
I have an aluminum radiator and a Tremec five-speed that I'm going to be putting into my Charger to replace the stock radiator and 727 tranny that's in there now. I'll probably be doing the radiator swap a few weeks before the tranny swap, and the new aluminum radiator doesn't have a transmission cooler built into it. Can I simply take the cooler inlet and outlet lines from the tranny and connect them together with a piece of rubber hose? This won't be a long-term solution - just a few weeks and a few dozen miles so that I can continue to drive the car until I do the transmission swap.

Thanks,
Scott Gardner

64dartwagon 07-22-2004 11:42 PM

yes you can run a hose between the cooler lines, just use a piece of high pressure line. They carry trans cooler line at most auto parts places. Just don't run the car for a long period of time without a cooler under a heavy load or the trans won't survive very long and we wouldn't wanna ruin a good trans i hope.

MoparMarcIdaho 07-23-2004 12:21 AM

no problem
 
Ive done it before,but you could get fancy and cut out a piece of A/C condenser and put that in there.Be sure to flange the ends so the hose wont blow off,or at least double clamp it.;)

skankweirdall 07-23-2004 02:41 AM

You could do this so you can move the car around, or you can run a quarter mile pass without a cooler but I don't think I'd want to do much else without the cooler. I certainly wouldn't drive the car around on the street without it.

madmax4073 07-23-2004 06:36 PM

You can get a long piece of hose or use steel fuel line and run it across the rad or some place where it will get airflow for a temporary make shift cooler. Not as good as a real cooler, but better than nothing.

pishta 07-24-2004 12:58 AM

30 PSI is the max that hose will ever see. Remove the inspection plate to get some air flow to the converter for some cooling. Demo Derby guys run their hoses coiled through an ice chest, but they do alot of other crazy stuff too.

hotrod7043 07-24-2004 09:22 AM

JUST GO BUY A COOLER ITS EASIER. 30 PSI MAX WRONG!!!!! THOSE LINES SEE 90 TO120 PSI PISHTA A T/F NEVER MOVE WITH 30 PSI WHY YA THINK THEY CALL IT "LINE PRESSURE"?

pishta 07-24-2004 01:48 PM

Hotrod, they call it line pressure because that is the working pressure, anywhere from 55 to 260 PSI to the clutches and servos. That is off the pump. The Torque converter control valve never lets more than 75 PSI to the convertor,and 30 to the cooler lines. Take a look at this diagram, the orange and white stripe is 5-30 PSI. This is pre-modified OEM pressure. Cooler is lower left on diagram
http://home.comcast.net/~pishta68/PDRM0026.JPG

hotrod7043 07-24-2004 04:27 PM

IS THAT WHY THE CHECK LINE PREESURE WITH A GAUGE AND THE DO IT THE COOLER LINES THIS IS A GOOD THING , IF IREMEMBER RT THATS WHAT CACY SERVICE BULLETIN SAID BUT IWIIL CALL THE 2 727 GURUS ROD HARPER IN AT R&D CHASIS AND HAROLD AT DYNAMIC CAUSE HE HAS A TRANSMISSION DYNO THAT THE CHECK EVERYTHING ON AND WE WILL GET THE CORRECT ANSWER AND PISTA WATCH THAT 91 FREEWAY.

pishta 07-24-2004 04:48 PM

Ok. I stay away from the 91 unless I need to go to the 909. They check various line pressures from the 4 test points on the case (Governor, rear servo apply, line and front servo release), none of which are the lubrication pressure port. . Let us know what you find out.
Oh yeah, turn those caps off, it looks as if you are yelling at us...

hotrod7043 07-24-2004 05:01 PM

wiil do phista i worked rt there on orangethorpe in 84.

ehostler 07-24-2004 09:34 PM

If it were 120 PSI, I'm sure that my bandage fix (on my '68 Charger) never would have held. The tranny line had been rubbing against the back of the block (probably from day 1). Eventually, it wore through and pissed the tranny fluid out, all over the interstate. Shelled the tranny.

I had the tranny rebuilt. While that was being done, I searched to try and find where the tranny fluid came out. I couldn't find it. I put in the rebuilt tranny filled it up with fluid and found the leak as soon as I started the engine. I ended up cutting the line and then runn a piece of fuel line on it with a pair of hose clamps. It never once leaked. Had the cooler line pressure been at 120 PSI, there is no way that this bandage would have held.

skankweirdall 07-24-2004 11:07 PM

Cooler and lube pressure are about the same at 5-30 psi. The fluid goes from the converter to the cooler to the output shaft support.


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