axle input shaft wrong size

[Littlebeeper]

I went to replace my axle shafts (just bought car and both were bad) and when i go to put the new ones on the input chaft to the transmission on both shafts is too small. I went to turn the shaft after i installed it to make sure there was no binding and the thing just spun in the transmission. It jumped the grooves i guess. I went back and removed the shaft and checked the input shaft on the old one and the old one is bigger. I went to 3 parts stores (O'reily, Autozone, CarQuest) and all had a small input shaft. They had no reason or answer as to the difference. Car is a '94 Plymouth Laser Turbo with a '93 build date. their computer showed same part # for '93 or '94. I even went to a junk yard and removed the shafts out of a Galant from the early '90s with 4G63 engine and the shafts on that were the same small size as the ones that the auto parts were trying to sell me. I'm out of ideas. any help or suggestions? I thought all 1g (91-94) were the same shafts? There was one post about this but noone replied to the guy and i have asked him too. I just fininshed reading 5 pages of posts on axles and found no answer. Anyone have ideas? Did the shaft input size increase for '95 and later model years? if so maybe they swapped to newer engine. Any help would be appreciated.
Thanks

 

[Mike1992]

awd and fwd are different thats all i can say

 

[sprint5speed]

Mine were that way also. :thumbdown I had to have the axels custom built with 93 outers and I think the shop said early inners to match the splines.

Charlie

 

[Littlebeeper]

damn, was hoping i wouldn't have to go the custom route. I have to drive to the closest large city to get to an axle shop. The car is a front wheel drive by the way. The old axls seem to be some high performance pieces. They have a thicker shaft to go along with the thicker input shaft. biggest weakness would seem to be the hub side as its the same size as the ones the autoparts store was selling. If i get no further input i'll check to see if they sell the joint kits like back i the day. That'll bee fun huh