Not trying to thread jack but im still getting the pieces together to do this same swap. If anyone can help I would appreciate it ?  Here's my problem.  Way back when I went to duals I was set up with a 21 spline 4.7 in the front and 2.28 in the rear. Didn't know any better at the time  So now I can only find the adaptor plate from the R150 to 21 spline from AA. Should I go ahead with this adaptor and the 21 spline or wait and replace the input gear to 23 and get the adaptor from Marlin.  I am not heavy on the pedal But if I wipe out the gear I will have to replace it with another 21 spline or spend $800.00 ish to go 23. This is my last piece to figure out before I pull the current 22r.  Any advice ?