Hi guys.

I am working with a 1995 Impala SS with a built trans and motor.

The issue I am having is that when ever I command a shift over 5800 it will make a crazy noise i cant describe and wont shift. (Its not the rev limiter)

I can command WOT shifts below that and the trans shifts quick and hard.
The motor can also free rev beyond 6500 cleanly with out any noises.

Have any of you had issues like this?