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Re: OT Truck transmission cooler
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Posted by Jon H on October 25, 2004 at 09:52:10 from (69.26.17.196):
In Reply to: Re: OT Truck transmission cooler posted by Allan in NE on October 25, 2004 at 08:07:15:
No problem Allen,I agree to disagree. This is the real world my auto transmissions live in as I see it. By the way,I also live in ND. I want that aux cooler before the radiator so the hot trans fluid does not add to the cooling system load in hot summer weather,in fact if the aux cooler is good enough to cool the fluid to say 100 degrees,it may actually help cool the coolant and engine as it reheats the cool fluid.
In winter where the aux cooler may get the trans fluid very cool,I want the stock cooler in the radiator there to reheat the fluid hot enough(atleast 150-170) to keep the condensation moisture cooked out of it plus getting the fluid thin enough so the transmission pressure regulator can control it and not run excessive pressure in the transmission. You rebuilt transmissions so you saw how many THM 350 cases were broken because the reverse clutch engaged with several times normal fluid pressure and broke out the reverse clutch snap ring groove. Usually at startup when the fluid was very cold and thick as mud.
As to hooking up a cooler with hoses,it is not a problem if done correctly. Many Ford and Chrysler products have the stock cooler connected with hoses and have no problems. I suspect that 99% of the hose blow off problems are because the installer of an aux cooler cut the original steel trans cooler line and tried to clamp a hose on a smooth line with no barbs or swedged bump in the line to retain it.
You must also remember that most newer auto trans with a lockup converter generate almost no heat when the converter is locked,much like a manual trans. In a cold climate like ND these lockup transmissions need the radiator oil cooler to heat the fluid hot enough to heep it thin and free of condensation moisture. My 92 chev with 4L80E transmission has an oil temp guage which never reads more than 150-170 degrees while cruising with the converter locked. I suspect that the only reason the fluid stays at what I consider a minimum safe temp is because of the fluid being reheated by the 180-190 degree coolant. Remember that an oil cooler is never 100% efficient and will have a 20=30 degree difference between the fluid temps unless the fluid is passing through it very slowly.JMHO Jon H(:-)
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