I was able to get my custom 1310 rear driveshaft installed today. It works perfectly!!! Installed exactly the same as the factory one, but the flanges on the new shaft were a bit thicker than the ones on the factory shaft. The factory hardware at the axle is M10 with 1.00 pitch threads. At the t-case, its M12 with 1.00 pitch threads. The factory hardware is long enough as long as no washers are used. I used red loctite on all the hardware, so it should stay tight. I tried to find longer replacement hardware, but It is very hard to find M10 and M12 bolts/nuts with 1.00 thread pitch.
The Neapco part numbers for the correct flange adapters are:
N2-83-288-4x at the t-case (ball/socket)
N2-2-799-1 at the diff
The working length of my driveshaft (static drive height) is 45-1/2", and this should be a "close" length for most 4wd 3rd gens with an auto, but I would recommend measuring at 3 and 9 o'clock on the flanges to confirm as different lifts will affect this length.
The driveline shop I used is called Quigley 4x4 (
4x4 Vans : Quigley Motor Company, Inc. > Home). They also build custom shafts like Tom Woods, but they happen to be close to where I live, so I could take my factory shaft to them. Quigley also charges $350 for a custom shaft (and this asumes no flange adapters). The flange adapters added another $115 to the price, so it was $465. I originally had Tom Woods quote me a shaft as well, but without knowing exactly which flange adapters were needed, they could only estimate up to $100 additional on top of the $350. If I have a chance, I'll call TW and have them requote it with the Neapco part numbers listed above.
I hope this helps someone else if the ball/socket fails in their driveshaft!!