rear swap/ driveshaft question.

So I'm bagging a 91 extended cab for a buddy on Tahoe wheels and we swapped to a 84 rear-end since it's narrower. When I got the rear-end I got the end off the 84 shaft as well but the 84 shaft is alot bigger in diameter than the 91's so I cant just get hte 84 end put in the 91 shaft. First thought was to make a plate with both patterns on it to go between the 91 shaft and the 84 snout, but (Finally, here's the damn question,) does anybody know if I can put the 91's snout on the 84 differential? Anybody done it? They both come off but are the splines the same? Thought I'd ask before I wasted an hour or so pulling them only for it not to work.

I have not done this swap in a long-time but if I remember correctly the older snout is shorter then the newer style so in the end the driveshaft is just short. I believe when I did it that I took the newer driveshaft in and showed them older mount I needed on one end, they ended up using a mount from an older dodge that has exact pattern, but different U-joint to match newer style end. Cost was like $100 to do it.

The Dodge joints are much easier to replace as well, good for bagged rides.

those kind of u joints are called bastard u joints, because they have 2 very different size end caps. i believe spicer will have u part number for wat u need

So your saying Spicer would have a joint that is 91 mazda on one axis and 84 mazda on the other? That would be killer.

yea i do believe so, i looked for the box that i had saved cuz it took me forever to find that u joint. let me chk in a few more places

I checked the spicer site as well as the two ends I have and the 91 shaft has pinned u-joints that spicer says are non-replaceable. I guess unless Eric has good news it's off to the drive shaft shop.

yea bro im still looking and it does say that it can not be changed but it can. dang i really wish i could find that dam box!! if i remember correctly i went to napa and they miced it out for me. sorry bro, but that u joint that they say can not be replaced, it can!!! but i guess all this is useless without sum sort of part num!!! damn it.......

Well i appreciate you looking man. I may try cross referencing it with some other manufacturers and see what I can come up with.