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Re: OT Truck transmission cooler
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Posted by Allan in NE on October 25, 2004 at 07:41:58 from (148.78.243.24):
In Reply to: OT Truck transmission cooler posted by Jack B. Nimble on October 25, 2004 at 06:52:36:
Hi Jack, Same old problem: Tranny heat. :>) Yes Sir, to my mind there is only ONE axillary transmission cooler for your truck and that is the one from GM. If you have one of those "hayden" or other after market types sold by the auto market parts stores, in my view, you are flushing your money down the toilet; they just don�t have the cooling capacity even though they are physically bigger. Just my view. :>) The "absolutely essential" external cooler (for towing) should be inserted AFTER the radiator and just before the transmission�s "in" port. The way those things work is that they take the transmission's lube oil and cool it, then return that lube oil to the reservoir. The only enemy an automatic transmission has is heat; and at 305 degrees, the adhesive holding the clutch material to the plates starts to melt and lets the friction material go. So, I try not to run a tranny much over 270 degrees to be on the safe side. A transmission temperature gauge is a good idea if you tow a lot. The reason your friend says that they do not work in the cold wintertime is not because they do not heat up; they will, that tranny always runs at better than 200 degrees. Just running down to the post office is going to heat up that tranny. Rather, it is because when first started in the wintertime, that cold oil is thick. If the cooler is not plumbed into the system right, the pressure will blow the hoses off even though that lube pressure is only 7 lbs; it is unforgiving; it has to go somewhere. Always use steel line on a transmission cooler connection and never, ever use rubber hoses and clamps.....they don't work in cold climates and will result in a failure. Hope this helps you a little, Allan
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