Just checked for codes and it’s throwing code 68 which from what I’m seeing could be anything from input/output shaft speed sensors to needing a transmission revuild
Welp I just got it to the correct level and no difference. Still fine when cold then starts slipping once I drive around for about 3-5 minutes. All other gears are fine and it’s effecting reverse now.
Also the truck currently doesn’t have boost because of a bad leak on the crossover pipe to the turbo so that may have something to do with it I believe
I just replaced my flex plate and starter on my 6.5 detroit with a 4l80e. It was running and driving great until 3 days ago when I was going up a pretty steep hill and then it leveled out and wouldn’t shift out of 1st gear. I pulled over and put the truck in park and shut it off then turned it...