[quote author=Warthog link=board=2;threadid=6236;start=msg50125#msg50125 date=1066011817]
Gumbster & Tres
LONGER splined, short side front axle shaft [need this for the locker to engage the axle]
[/quote]
Sorry Joe, your post was almost perfect...

For the FRONT you need the long side axle shaft to have long splines--it's the rear that would need a longer splined short side. This is because when you swing an 80 series REAR diff around to the front of a 40/55/60/whatever the actuator goes from being on the passenger side in the rear, to the drivers side on the front. Thus, the long splines need to be on the long side.
And yes, the long splined axle shafts can be found for a decent price, but it's kinda hard to do. You can find it new from the dealer, but you gotta have an excellent parts guy to do it cause it's not a USA part... (I got mine from C-Dan. 70 series FF long splines short side rear for a FF axle assembly.) I have just found out that the axle shafts from 70 series are exactly the same lengths as 40 series shafts (Thanks Rick D) and some 70 series came with factory cable lockers so the long splined long side for the front is indeed available new form the dealer. But anyways, there are some companies that'll make the shaft for ya too. I believe you are right about CV Unlimited, but I beleive Moser does it and there's a few more I believe but I can't remember them. They came up on Pirate--I'll try to find them later...
Also, TRES, if your trying to swap in just the diff, check
www.car-part.com dude. I got both of mine on there. Ya, one was ~2 hours away so I just drove down and got it, but the other was waaay down in Texas somewheres. They shipped it to me for $25!!!

From Texas to Northern Utah for only $25 for a heavy ass diff like that... Try it out dude. It might not be as much $$ as you expect. Also, most of 'em will work with ya. There was one in Kentucky somewheres when I was trying to find my second one and the dude was super cool about beatin' prices, but he couldn't beat the no shipping I found.
-Ferg-
P.S. Here's a pic of a REAR 80 series locker in the FRONT of my FJ60 axle. Notice the actuator on the drivers side.