I have a K3500 7.4L and the other day it started to not shift out of 2nd and then 1st. The speedometer started going 'wack'. So I'm hoping it's something easy like the speed sensors. I will just order both. I'm assuming it's a 4L80-E. I haven't looked yet.
transmission not up shifting
- Thread starter Sunbelt56
- Start date
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