833 reverse pops out (1st post on board)

The sideplate only has a 1-2 fork and 3-4 fork with a ball and detent mechinism in between the two forks (2 balls, 1 spring). Thats what the 64 Plymouth manual shows and thats all I remember on the sideplate. The reverse fork is located in the trany housing itself below the sideplate and it has a ball and detent mechanism below to the left of the tailhousing with the parts like you described Jim.

I'm assuming that that is the problem then. Is there a way to adjust the tension on the spring by tightening the center threaded bolt or just replace the spring and ball.

As far as this working it is suggested in the Mopar Performance manual and I checked with Passon before ordering the new shift forks for the older side plate. It shifts alot better then the truck style plate and spring setup. Thanks for the help guys.