Transmission Cooler with Fan Recommendation for a 1997 GMC RV with a 4L80E Transmission

Question:

what would be the best cooler/fan combo for me to use on my RV.The engine keeps temps in line usually, but on long steep 6-8 mile long grades the tranny heat goes up to redline almost always. I am even considering putting in 2 more in series with the OEM cooler. Would probably place the 2 new ones under the frame near tranny since there is so little room in the front of this frontend diesel. Since the tranny lines are only 5/16 is it even possible to use step down adapters to get to this coolers line size? Would this difference alter the fluid pressure dangerously? thanks,

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Expert Reply:

I would go with the Derale Hyper-Cool Remote Transmission Cooler Kit w/ Fan # D13960 since this one comes with all of the installation hardware and lines unlike the # D13870 that you referenced.

The cooler on this setup is a stacked plate design which is the most efficient style on the market and the fan will flow 500 cfm of air through the cooler to keep the temperatures down.

If your transmission temp gauge is maxing out then I would strongly urge you to install this product so that you aren't replacing your transmission anytime soon.

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Jameson C

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