My 2015 Sierra trans fluid is burnt looking. 121,000 miles on trans. 75,000 on fluid. Tech said pan was pretty clean for how dark the fluid is. Changed filter and refilled w new fluid. It did shift a little better after.
Questions are: what caused the burnt fluid and what problems should I be looking for? Should I dona flush to replace all of the fluid or do 2 more pan drains?
Trans temp never gets over 200 and I very rarely pull more than my lawn mower on a random utility trailer. It’s mostly highway runs but it does idle a lot.
Looking for ideas.
Posts: 384 | Location: Parked... | Registered: May 27, 2007
Converter and pump is about to poop the bed. The converter design frankly sucks and should be a billet. Also, modifications need to be made to the pump to help with the converter issue. Once this is done, they last a long time.
Posts: 681 | Location: Evansville, IN | Registered: February 24, 2010
I don't know anything about the 6L80E, is it supposed to be an improved version of the 4L80E? (Or just 2 more gear ratios, but possibly at the expense of durability)? My old 2002 HD2500 had the 4L80E, and it was bullet proof, hauling a lot, over plenty of mountains, etc. No issues in 285K miles. Curious if anyone has the eight-speed 8L90 trans in their 2015 or newer truck, and if it was a costly option, or not a lot of additional money. And would like to hear how those with the 6 and 8 speed trannies like the performance, especially with regard to towing.
Dan "Jim" Moore Much too young to feel this damn old!!