1966 T5 Vibration Issue

I have been involved in a number of T5 swaps, and in every case, we were able to use the existing driveshaft and slip yoke.

Have you re-checked the driveshaft? The slightest dent or twist will cause problems. New driveshafts can had quite reasonably- Certainly it would cost little more for a new one than to buy and modify a used one.

Good thread!

I've just put a t5 in my drivetrain, but haven't yet driven it really.

you need to eliminate the trans as being the problem.

FYI, it's not the bushing in the tailshaft that would cause a vibration, it's the mainshaft in the trans.

I'm not sure what to tell you shy of pulling the t5 and measuring the mainshaft on bench with a dial indicator. While I've rebuilt 10-15 t5's and haven't come across a bent mainshaft yet, it does happen, and if that's the problem you'll be chasing your tail forever.

If you can get a known good t5, you may want to try that