Why des my transmission shake when shifting gears

At high rpm like 4000 5000 or 6000 it shakes and shutters.....I know I shouldn't be that high all the Time but I just got a used tranny and as testing it

Auto or stick ?

Auto

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My guess is improper fluid. If you use the wrong stuff, it can do this. Also if it isn't filled properly and low on fluid.

did you get under it and look at the transmission mounts? mount bracket could be loose, or mounts themselves could be totally deteriorated and worn out.

Motor mounts?

The last few days it hasn't shook, but when it's a cold start sometimes it shifts late and rough until the car is warm...?

Could be the suspension. I had the same problem when changing gear and when the traction control kicked in. It turned out to be the passenger (left) side of car, both shockers were burst. New coilovers on the front and shockers on the rear and haven't felt it since.

Keeping in mind it felt nothing like the suspension and I was positive it was the gears.

Originally Posted by Aberdeen-Danny

Could be the suspension. I had the same problem when changing gear and when the traction control kicked in. It turned out to be the passenger (left) side of car, both shockers were burst. New coilovers on the front and shockers on the rear and haven't felt it since.

Keeping in mind it felt nothing like the suspension and I was positive it was the gears.

Shocker ???

I can sense some language barriers on this thing already...

Originally Posted by smolck

My guess is improper fluid. If you use the wrong stuff, it can do this. Also if it isn't filled properly and low on fluid.

kshade40... check and eliminate these first. And move on from there.

Could it be a leak!?!