Rev limiter
I know 5 speed are known for bending push rods but mines an automatic. Ive had the transmissions line pressure tuned with hp tuners and the shift points have been moved up a little but nothing extreme. I have never messed with the rev limiter.
Manual transmissions bend pushrods because people shift 1-2-1 missing 3rd mechanically forcing the RPM's too high.
On your HP tuners; it's possible that when you raised the shift points, you put them too close to the rev limiter.
Dragkid was right as well....
https://ls1tech.com/forums/automatic-transmission/1002170-transmission-acting-strange.html





