Per my experience above, I wouldn't worry about an occasional 210F at all on Dex 6, especially if it's really hot out, and / or you're towing.įinally. The old adage was "under 200F, or you shorten the life". But regular Dexron VI is supposed to be fully synthetic as well (they just don't list it as such). Granted, I had a 'full synthetic' Dex-specific fluid (Valvoline). If you look at a temp gauge from a HD pickup, the 'overheat' marks don't start until after 250F. I have admittedly retired it from tow duty, now that I have the Sierra HD.Īs far as 'max temp' on Dex 6 - I've seen it listed (in more than one place) at 275F. Truck was shifting between 2nd-3rd gear up the mountain (no tow mode in the Envoy, so I keep it in '3' when towing), so the truck was being stressed, no doubt.Ī year later, the fluid still looks / smells new, and I have no issues with the trans (it was rebuilt about a year before I took that trip). I had 4500lb on the bumper, 6800ft, in 95F temps last year with the Envoy (in Montana), with a Derale 10K stacked plate - and the highest it got was mid-230s. maybe get something a little larger, but you can still run it in bypass. put in a 10K BTU unit, and you'll run 160-180 all day long (180 when it gets about +95F out) Can't remember from when I did the filter and fluid change, how much dripped out when the lines were disconnected, so I'll have to make sure I have some extra fluid on hand just in case. One time I remember it getting up past 210, which I'm sure is still acceptable, but it's considerably higher than what I'm used to seeing, so that made me nervous.Īnyone know of any cons to this idea, that I'm missing? The return line is already connected to the aux cooler, so moving the other hose to the feed line wouldn't be too hard. On the rare occasions I do longer trips out of town, I'll see the tranny temp climb after being on the highway for a couple of hours, then hit heavy traffic with a lot of idling, so not much air flow. The transmission temp tends to read 20-30 degrees below the coolant temp. So I don't think I'm gonna see the scenarios where the tranny fluid needs to get warmed up by the engine coolant.įor the most part, my drives aren't very long (distance, or time wise) usually under an hour. The few times we get near the freezing mark, is overnight during our short 'winters', and the truck is garage parked. Since I'm in FL, we rarely see super cold temps. As I wait on a new radiator to arrive, the thought of bypassing the OEM tranny cooler, and running the aux cooler with built in thermal bypass by itself, crossed my mind.
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