Tranny temps: how hot is too hot?
I recently got a 5th wheel camper that I will be towing with my 2011 Silverado 1500 LTZ. It has the HD trailering and HD cooling packages (RPO codes K5L and Z82). What would you consider to be high tr...
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I'd personally shut down at 230* (stop at a pullout, idle truck to circulate fluid and help cool transmission).
I hit 223 the other weekend while pulling in 95-105 ambient. All was well climbing the grade until we caught a motorhome, then a dump truck with a pup, and I was screwed. I was in 1st gear fluid coupling only, not going fast enough to get a decent amount of air across the coolers. We got stopped at some construction for a few minutes so I kicked on the high idle at 1500rpm to spin the fan faster and draw more air across the cooler, helped it cool down about 10*. Once we topped out and got going fast enough to lock the torque convertor again (above 25mph) the trans cooled right off to just under 200.
I was pulling only ~6500lbs. I pretty much had worst case scenario.
I hit 223 the other weekend while pulling in 95-105 ambient. All was well climbing the grade until we caught a motorhome, then a dump truck with a pup, and I was screwed. I was in 1st gear fluid coupling only, not going fast enough to get a decent amount of air across the coolers. We got stopped at some construction for a few minutes so I kicked on the high idle at 1500rpm to spin the fan faster and draw more air across the cooler, helped it cool down about 10*. Once we topped out and got going fast enough to lock the torque convertor again (above 25mph) the trans cooled right off to just under 200.
I was pulling only ~6500lbs. I pretty much had worst case scenario.
