Rebuilt 4L65E: Now shifts hard from 2nd to 3rd

[Mudsport96]

The builder still has the paperwork so I can't give you a definite answer. I'd think it did have any updates done to deal with known issues since it went in for a complete rebuild and be beefed for added HP.

I would double check that the tuner didnt up the line pressure to help avoid clutch slippage with the new engine.

 

[Rocket Man]

Like this? Lol

Yep, here’s mine.

 

[m1949]

Yep, here’s mine. View attachment 374567

Oh wow!

 

[Mudsport96]

Oh wow!

Yeah, drawbacks of the short 4x4/AWD output shaft. Being shorter than a 2wd shaft it has less forgiveness with harsh shifts and tends to break at or near the planetary set. So depending on hiw hard yours is shifting i wouod take it easy till someone can look at the tune for above half throttle shifts if that is where they are harsh.
I did that in a 2 door 4300 vortec blazer. But shift points were set on kill as it was mud raced and bogged... along with being my daily driver.