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1) the original 99 (and 79-80 900) driveshafts use two dished washers at the outer end to pre-load the circlip that holds them to the outer CV. This is why the whole enchilada has to come off and go into the press to separate the outer CVs. These dished washers were eliminated on the 81- driveshafts, so when you reassemble with the ventilated brake setup, just leave those out.
2) In case you didn't know, the differences between 1981-1987 900
axles without and with ventilated brakes are these:
a) brake rotor (but you knew that...)
b) caliper - though actually, the ONLY part that changes
is the flat plate or "yoke". All the rest is the same.
c) Hub. This is the part that gets secured to the outer CV
splines, and carries the wheel and rotor. You CAN NOT
just slap ventilated calipers and rotors on a non-ventilated
setup.
2a) And the differences between -80 and 81- setups are:
a) steering knuckle - HUGE difference in unsprung weight here
b) hub - rotor mounts where it is supposed to: on the OUTSIDE
of the hub
c) rotor (see above)
d) bespoke knuckles left & right. The earlier ones actually could
go on either side, you just had to swap the tie rod piece
e) CV joint - different design
So, it is easiest to get the whole arrangement from a turbo.
It would also be a good idea to replace the wheel bearings, and at the least, re-grease the outer CVs, if not replace them outright. AND USE NEW NUTS on the hub/outer CV connection.
(Once upon a time, the Sport & Rally catalog carried a ventilated front disc setup that bolted to the 99's original steering knuckles...but I think I'd still prefer the 900 setup for the weight savings.)
Regarding rear axles, there was one functional difference between 99 & 900 rear axles. Sometime in 1981 or later, the rear wheel bearings were changed to be integral with the rear hubs. Not rebuildable. They also beefed up the lower trailing link, but that's likely not needed in most cases.
_______________________________________
Current:
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Past:
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2002 9-5 Arc
1990 900 5-speed
1986 900 turbo Convertible
1991 9000 turbo
1980 99 GLi
1986 900 turbo
1986 900 S
1991 900 turbo
1984 900 turbo
1976 99 GL
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(#1140) 
[Profile/Gallery]
(more from Larry West) on Fri, 18 Oct 2013 06:53:25
, Sat, 19 Oct 2013 06:44:20
, Tue, 15 Oct 2013 17:48:14