I have a 1995 trans am with a 4l60e. It is doing something very odd that I need advice on. When I am driving the car and it starts to go into OD the car shakes and feels like I hit a rough patch on the road. It only does this when driving with restraint. When I get on it or go into OD when the rpm's are a little higher there is no signs of the shaking or rough feeling. Any of ideas?

 

are you sure its not the converter locking?

 

Might be what they call convertor sudder from worn valve bores in the valve body.

 

I guess it could be the converter locking. Its just not done this before, Is this a big problem?

 

You might try raising the lockup point what type converter is it ?

 

Its an Edge Racing 3300 stall.