I had a crack form starting at the bottom corner of the input sleeve notches on my '68 trans. Sent it in and they welded in a new one with a smoother radius at that location.

Great tips on measuring the run-out using the transmission case, but be sure to ensure the case is square to the block/crank flange too. A lot of people overlook this step, but my '70 manual trans car was off enough to use shims to get it squared up.

Shims.JPG

1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)