Do 4 spds have different half shafts?

I recently took my car into a mechanic because i just put a new transmission in and i was tired of working on it. I took it in for wireing but he noticed while it was on the stand that my halfshaft was sticking out about a quarter inch and wasn't sealed. He told me some of the 4t40's have differen't half shafts and i might have to get one specificly for this 4t40. I think it should fit, but he insists its probably the wrong half shaft. Do 4t40's have differen't half shafts? the driver side fit, but the passanger side didn't fit.

440T4 shafts vary in length from the TH125.Also,440T4s have a different shaft diameter left and right.The seals on the output shafts are different.Go to NAPAONLINE.com and try a number of different year/trans combinations and see what part numbers you come up with.