OK--I gave up after searching for quite some time. The info is probably somewhere on a post, but I could not find. I have a 1949 3/4 GMC truck with a 6.14 rear end and have found a higher gear ratio rear end in a 1970 GMC 3/4 ton with a positrac rear end. Will that differential swap into my 1949? Both back plates are 10 bolt, but the pinion shaft looks smaller on the 1970 model. Not all apart yet, so can not confirm. It would be good to know before I start taking all apart. I have seen posts that Chevy differntials will swap up to 1972, but not sure if all GMC models will work. I do not want to swap the whole axle, just the differential. Sorry about a possible duplicate post, but I would appreciate some advice.
Thanks
