1964 Dart 4 speed with overdrive

AJ/FormS said

My problem was not the first gear, both the 3.09 low from 64/65 and the 3.09 from the overdrive, and the 2.66 from the standard A833 in my stock; are all the same MS gear .
My problem was the huge overdrive gear on the cluster. I would have had to cut my standard 2.66 cast-iron case at least .25 to .38 inch in that area (IIRC), just to get to zero interference. That's a chitload of work, and if I cut thru, ........ so I just put it all back into the aluminum box and got the proper BH. The local JY had a pile of them

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Funny, I've done 4 or 5 so far and not a problem. I also know of someone running an O/D behind a 440 six pack in the original 440 case, just took a little clearancing. I always take a box apart anyway, so replacing a main case for $125 solves a lot of problems and I can just bolt it up to any A Body bellhousing. I don't have to play with clutch linkage and the only thing I have to change is the 3/4 shifter rod and arm. In a /6 there is no advantage to the newer Bellhousing since you are still limited to a 10" clutch.