UR opinion, extra transmission cooler..
I pulled the grill on my (5.3 Liter, 4L60e transmission) Suburban to install an oil cooler and there's a factory oil cooler mounted behind the grill already. I traced the line from the return side of...
Forum Discussion
Terryallan wrote:
Nope you don't need it. And to be honest. You want the transmission running at temp. Too cool can be a problem. could keep the trany from changing gears correctly. They change differently before they warm up, at least mine does. Won't go into OD before it warms up.
ScottG wrote:
I would not add it unless you know for a fact it's getting too hot. You can over cool the fluid.
If it won't go into OD until it warms, then something aint workin right. I've never owned a vehicle that acted that way. Of the 3 major brands, I've owned compact, half ton and heavy duty trucks from 1987 to 2017 year models that never did this (except I've never owned a S-10).
I see that the "don't run your transmission too cold" theory has once again shown up. A while back on this forum, an actual transmission engineer totally dispelled this myth with proof from case studies. Also, FWIW, this topic is never discussed on the Ford or Ram forums I read. I've never seen this anywhere except on the RV forum.
I would replace the factory cooler with a high quality aftermarket unit if you're seeing concerning temps or if you intend on going more heavy-duty with your towing characteristics. Most of the OEM coolers placed on half-ton trucks/SUV's aren't very capable. But as others have said, if you're getting normal temps I wouldn't touch it.
