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6l80 6th gear trouble on highway

6l80 6th gear trouble on highway

Postby Silvermado [OP] » May 03 2021, 5:29am

I’m sorry if this is a stupid question,I think it’s gearing but I’m over thinking it, but I have 34 inch tires with 3.42 gears, and going about 75-85 mph, my truck will downshift to 5th going up just a slight hill and then when on level road it won’t shift back up till I go into manual and up shift it, is this a problem or just a sign I need to regear
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Re: 6l80 6th gear trouble on highway

Postby Bradley21sanders » May 03 2021, 1:45pm

I was running 33s and 3.42s and mine would do that if I was pulling a load but I don't remember it doing it without a trailer.

I then went to 4.11s and now have 4.56s and a different carrier as well. both of these lower gears helped tremendously pulling the trailers, now I do not have gear hunting on the highway around 70mph pulling a trailer.
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Re: 6l80 6th gear trouble on highway

Postby judsonlimited » May 03 2021, 3:03pm

Thats probably your sign to regear
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Re: 6l80 6th gear trouble on highway

Postby GBSierraSLE » May 03 2021, 4:04pm

Did you tune your truck for the taller tires? It throws things off if you don't.
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Re: 6l80 6th gear trouble on highway

Postby Silvermado [OP] » May 03 2021, 5:55pm

I did not retune I always thought that was just for the speedo
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Re: 6l80 6th gear trouble on highway

Postby GBSierraSLE » May 03 2021, 6:24pm

The vehicle speed sensors feed the ECM and collaborate with the TCM, etc. If the ECM is reading a given speed but the TPS, and other factors, don't match-up with it, the ECM and TCM will try to compensate.
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