47rh vibration

I have a simi built 47rh in a 93 with the mighty VE )

I’m getting a vibration in 3rd gear only. Locked or unlocked doesn’t matter it’s RPM related. Starts to vibrate around 1,800 gets progressively worse to 2,400ish and then more or less goes away. It’s not slipping whatsoever, feels like a first order vibration (driveline speed) shakes the whole AZz of the truck.

Bilit input, single disk bilit converter, all the usual VB things and internal transmission upgrades. Line pressure is 150~ at the middle port. New build in a new truck.

I’m all ears.

Check your flex plate

Have you tried changing your fluid and filter?

I'm sure by now you've figured it out and fixed it. What was it?

Drive-shaft carrier-bearing?

Like always my homie swamp donkey nailed it. No noise at all but my plate was cracked nearly half way around. Swapped in a PDD SFI unit and we all good.

You know I'm lookin out for ya brother.