Question about rear seal on the Rb20 Trans

[Kevin.A]

I'm not sure if this is the right area to ask, but when i had my drive shaft made, it didn't 100% go into the back of the trans.
Now my trans is leaking out of the rear seal.

my questions is this:
1) how accurate does the drive shaft have to be to prevent leaking from the seal?
(I'm guessing the front of the drive shaft has to sit against the seal, but I'd like confirmation)
2) What's the best way to measure so i can have the correct drive shaft made?
3) is there a place online that makes driveshafts for the RB tran's?

Thanks
Kevin A

[Carl H]

there should be a little bit of 'free play' in the driveshaft yolk to output shaft fit, dont want it completely against the seal as that will cause binding in the drivetrain.
sounds like you have a bad seal rather than a wrong driveshaft...ka seal works just fine.