Here's a trick I did with my 73 Roadrunner 4 speed OD swap, and it worked perfectly. I turned the 5.125 Bearing retainer down to the std. 833 size. A small tack weld at the very bottom of the retainer where the weep hole was exposed fixed that issue, and allen head bolts through the retainer and into the case fixed the other issue. I did have to dress the sides of the bolts to get them to clear the bellhousing, but I could have just as easilly ground the clearance for those into the housing. Doing it this way makes swapping between the transmissions a piece of cake.
