2012, 6.0, 6 speed, transmission with dash temperature reading. What is an "acceptable" (or, not acceptable, a.k.a. bad) temperature reading? I'm use to my D/A allison readings which will probably run lower than the chevy 6 speed. I tow a heavy TT (11,500 lbs). What readings do you get on summerdays while towing?
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My 12' Chevy DRW (Allison trans) towing 18k has reached 173 (per the "data center"). It gets to that temp after towing for 2-3 hrs and i hit traffic. On the flats or hills it usually runs arounds 150-160.
When I had my 08 I never saw the gauge go above 200 while towing my 11,000 pound TT.
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Old transmissions 210* newer 2002 and up you can run 250* all day without issue. The new synthetics are good to well over that, I talked with our engineer that told me you can run well over 300* without any issue.
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Just make a 2200 mile run to FL in a 2012 Tahoe GM 6 speed with the M option.
Not towing I never did see it over 173F but that was from hard take off's up a grad. Monteagle made it go from 140F to 150 both going up and coming down. I used M4 coming down to not get much over 55 MPH. Air temp was in the 50's.
Noticed the Tow/Haul feature locked out OD #2 but I could not tell it increased transmission line pressure like on the 2002 4L80 transmission. I liked the 2012 GM six speed. The M option permits most of the "planned" braking to be done with only the engine. It "seemed to" increase the engine RPM's before the shift down so they were in sync before the manual down shift would occur.
From what I can read temps under 300F mainly cut the life of the ATF which then can cut the life of the transmission if not changed when needed.
I've reached 228 towing 7,500 lbs fifth wheel up a forest service road. Was a little worried at first but like others have said fluids now can take more heat today. I think short times under 250 should be ok.
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