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  #1  
Old 07-22-2004, 11:34 PM
riquiscott riquiscott is offline
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Default 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.

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Scott Gardner
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  #2  
Old 07-22-2004, 11:42 PM
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64dartwagon 64dartwagon is offline
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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.
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Old 07-23-2004, 12:21 AM
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MoparMarcIdaho MoparMarcIdaho is offline
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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.
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Old 07-23-2004, 02:41 AM
skankweirdall skankweirdall is offline
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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.
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  #5  
Old 07-23-2004, 06:36 PM
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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.
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Old 07-24-2004, 12:58 AM
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pishta pishta is offline
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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.
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Old 07-24-2004, 09:22 AM
hotrod7043 hotrod7043 is offline
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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"?

Last edited by hotrod7043 : 07-24-2004 at 09:29 AM.
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  #8  
Old 07-24-2004, 01:48 PM
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pishta pishta is offline
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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
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Last edited by pishta : 07-24-2004 at 01:50 PM.
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Old 07-24-2004, 04:27 PM
hotrod7043 hotrod7043 is offline
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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.

Last edited by hotrod7043 : 07-24-2004 at 04:28 PM.
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Old 07-24-2004, 04:48 PM
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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...
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Old 07-24-2004, 05:01 PM
hotrod7043 hotrod7043 is offline
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wiil do phista i worked rt there on orangethorpe in 84.
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  #12  
Old 07-24-2004, 09:34 PM
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ehostler ehostler is offline
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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.
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