Join Date: Jul 2006
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I haven't done any trailering yet, that's to come Labor Day weekend when I make a trip to the ranch.
Without a trailer, before any coolers, a run to the ranch in Texas heat (378 miles I-10) normal transmission temps were around 200*~210*. This was just with a good load (of feed corn) in the truck of about 2500lbs. Engine coolant temps would stay normal according to the OEM gauge at 210*. But when I opened the hood, it was really hot under there when I got to Uvalde.
Last weekend, after both coolers were installed, Texas heat at 94*, a 60 mile drive @ 65~70 mph, transmission temp did not rise above 162*, engine coolant temp gauge was actually moving a little from about 180* to maybe 190~195*, best I could tell. I actually pulled over under the Trinity River bridge and locked up the brakes, raised engine rpm's to 1500, and let the trans and engine heat up. It didn't take long (5 min maybe) for trans temp to come up to 205* or so, and the engine quickly came up to over 210*, maybe to 220*. I got back up on the highway to 65 mph. After about 15 miles, trans temp was back down to 162* and engine coolant temp was back down to maybe 185* to 195*, best I could tell from the OEM gauge.
I feel confident that even with a trailer, I will see similar results. I've done this kind of thing before with my 1991 GMC with a 7.4L. I had just been looking for a good setup to fit my '05 without doing a bunch of fitups myself.
So far, I'm a happy camper.
Previously Owned - 2002 GMC 2500HD D/A, Long Bed, CC, 4x4
2005 GMC 2500HD D/A, Long Bed, CC, 4x4, Mike L '06 Trans Cooler, TD-EOC
1991 GMC 2500HD 7.4L, 4L80E Trans, Long Bed, Ext. Cab, 4x4
Honda Gold Wing - 1984 Aspencade - Original Owner