I installed one in a newly rebuilt trans but the trans would not shift into 4th. The trans builder thaought it was causing the problem and changed it for a Corvette servo and now it works. Has this happened to any one else I'm stumped.

 

billet servo...bad...i think it breaks band anchors or something
corvette servo...good

 

exactly.

 

Billet servos can cause component breakage, but what I don't understand from this story is the actual "corvette servo" is a 2nd gear piston. 4th (or OD) is a different piston. So all I can figure is that something might have been misassembled, and during the corvette servo install, go reassembled correctly.

 

I have ran in to this with the tci servo and what i found was the secound servo wasnt machined properly.

 

seent that also. did a 4l60e in a truck that wouldn't shift into od. found 4th servo was misaligned and going sideways not allowing od. polished on the pin and inside piston and fixed the problem.

 

I have seen a few sets of servos that would not work correctly do to a botched install. Never had a problem with properly installed billets here, not even a band anchor.