Re: Rear end with Ultramatic

Posted by Randy Berger On 2008/7/13 23:35:51

I had converted a 1952 250 to standard transmission and it lacked power to go up some Pa. hills without downshifting. I installed a 1953 OD tranny and the 4.1 rearend from the same donor car(Clipper) and it ran much better as I had the best of both worlds. I'm not sure of 55 and earlier but 56 has a tag on one of the rear-end bolts that gives the ring and pinion gear numbers, so you can determine gear ratio easily. Of course if you can see the ring and pinion it is an easy matter to determine the gear ratio.