#2849, "RE: Twitching gears at 5.000 rpm only" In response to In response to 3
If your friend is a mechanic he should know where to look.
Im not gunna explain where the torque converter is or what it does in great detail but here goes :
(TC)
There you go. The TC is in between the engine and transmission. You can't see it without taking off maybe an acces plate or taking the engine and transmission and seperating them.
SEARCH for the way to do the torque converter lock up mod.