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How sure are you about the driveshaft being straight, made of strong enough tube, and the yokes being straight??
Driveshaft vibration is the #1 killer of trans cases in the drag race world.
Shaft needs to be straight withing .020" run-out, and of thick enoughh wall tube to prevent it from bowing under power and rpm. Too thin a wall and it will take on a form that looks like a swinging jump rope and vibrate like crazy, if it doesn't outright wad itself up and exit the vehicle.
Total run-out on the shaft needs to be less than .020". Have you checked the driveshaft run-out, while installed in the car?? This can be very telling.
Is the vibration there in nuetral but engine revved....or is it only in gear while unmder power??
Vibration there at speed but trans in nuetral, car coasting??
Output bushing in trans good and tight, and same for the slip yoke fit into the bushing, no noticable slop?
You didn't recently add a solid transmission mount, did you?? These are also trans case killers.
Driveshaft vibration is the #1 killer of trans cases in the drag race world.
Shaft needs to be straight withing .020" run-out, and of thick enoughh wall tube to prevent it from bowing under power and rpm. Too thin a wall and it will take on a form that looks like a swinging jump rope and vibrate like crazy, if it doesn't outright wad itself up and exit the vehicle.
Total run-out on the shaft needs to be less than .020". Have you checked the driveshaft run-out, while installed in the car?? This can be very telling.
Is the vibration there in nuetral but engine revved....or is it only in gear while unmder power??
Vibration there at speed but trans in nuetral, car coasting??
Output bushing in trans good and tight, and same for the slip yoke fit into the bushing, no noticable slop?
You didn't recently add a solid transmission mount, did you?? These are also trans case killers.
