Ok, heres my issue. Something in my tranny is wrong. Under full throttle when I'm shifting fast to 3rd instead it will go back into 1st. When I am going from 3rd to 4th, it will slam me into 2nd. This results in my RPM slamming to redline and my rear locking up and making a loud thump noise until I throw the clutch back in and let the car chill. Are my syncros crapped up? Bent shift forks?. What is going on here? Also, with that loud thump after it hits the wrong gear did it screw anything in the rear up? The gears(4.10s) didn't seem whiny or anything and it is a 12 bolt rear so am I good? Thanks guys.

 

should post in the drivetrain section!!