Thrust Block with 489 Sure Grip

I think it may depend upon if you use Mopar Performance or older Green Bearing (RP400) versus the newer style MO400.
I believe that the MO 400 uses snap rings which may give enough room so that you do not have to remove the block or button. The Rp400 the bearing was crimped onto the retainer moving the axle inward so the block or button had to be removed. Call Dr Diff he can verify what needs to be done.