Z31 driveshaft and other driveline compatability information

I can measure the 30a 2-seat and 71c 2+2 for you at some point....

Good info, thanks.

Axle Stubs and Companion Flanges have always haunted me as I have nevewr had the luxury of changing them on the z31's untill today. I read that the book time for the changing of the bearings was 2.8hrs and Based on everyones responses, complaints, etc..over there at z31.com, I thought I was in for a real PITA.

**With the proper tools, these things pop right apart, "piece-a-cake". (I love how the FSM goes through the complete steps..hahah, yeah, right!)

Here was my method that worked real well:

The biggest thing is popping the companion flange off first in the direction of the differential after impacting the stub axle nut off with a 30mm socket. I used a decent slide hammer to do this then pulled the axle stub out the opposing way with the same type of tool.
It actually only took a couple hours to do, start to finish.
**The inner wheel bearing and grease seal came out and went back in with the same slide hammer method. Quick and Easy.
The next issue is the outer bearing…getting it off the axle stub and then back on.
**This requires a large bearing seperator and a press**

^^Half the battle is having the proper tools and the proper instruction^^
>>>>I hope everyone else has as good of luck doing these as I did

Companion flanges are different between 84-86 and 87-89? Are you talking about 4/87+ (W series) cars? Wow, I was planning on swapping my 84T flanges into my early (non-W) 87 NA for my home-made halfshafts. So according to this, they won't fit? Whats different between them? I have never heard this before…

excellent… so distilled this means
84-86 - rectangular flange
87-89 - square flange
2 seater - 34" length
2+2 - 42" length
71c yolk - 1.38" diameter
30a yolk - 1.655" diameter
90a (t5) yolk - 1.5" diameter

I will add all of this information to the first post. Thanks guys!

Am i reading correctly that 87 halfshafts do not swap into 86na car, even with the proper 87 flanges?

the front end is tranny specific, the rear end is year specific, combine

so to clarify something for myself, if I'm going to swap an 71C into an 88 Turbo auto, I need the differential flange and drive shaft and thats all?

read the chart again.... you may not need the flange

As long as were talking driveline compatibility:

If swapping a BW T5 into your 87-89, or if swapping a 30A into your 84-86, The transmission mount will need to be modified. The holes need to be slotted in the mount and/or the transmission to allow alignment with the tunnels mounting points.

Like Mike said, "as long as were talking driveline compatibility:"

You cannot hybrid z31 half shafts with 90-96 q45 half shafts simply by pulling the two apart and mixing and matching pieces. If you could it would enable you to run the beefier Q45 diff in the z31. But you cant. You also cant just drop in the Q45 diff and half shafts. The shafts are different lengths. It is not impossible but requires fabrication. I am going to see if the carriers will swap over. If they do without a problem, then all that is required is cutting half shafts, shortening, sleeving them and welding them back together.

EDIT:

The carriers do swap over just fine, so like I said all you have to do is shorten the half shafts and splice the z31 and the Q45 half shafts together and weld. Or you can have a custom axle made that allows the Q45 CV on one side and the z31 CV on the other side. Each one of those axles cost's approximately $200 a piece to have made. Yes you need two of them.

Is there a difference between the left and right side axles on an 86na. im trying to buy new axles, autozone sent me one correct one, the other one they sent me was for some type of front wheel drive car. so they say it was boxed wrong and they send me another, which of course is the same wrong one they sent me in the first place. I know there are different part numbers, but maybe ::crosses fingers:: they are the same so i can tell these idiots to just send me another one of the axles i got that was actually right.