Re: Difference between '84 4kq and '85+ 4kq rear axles?

[Martin Pajak <quattro@rogerswave.ca>]

> yes there is a difference....the early units use 10mm triple square bolts, as
> opposed to the later model's 8mm tsb"s therefore the inboard cv joints are
> different...the rear diff seals are different...the later model version being
> much smaller..and a whole lot cheaper{less expensive}...I 'm not sure , but I
> think the
> 84-85 unit is 4.11:1....Maybe someone else can clarify the ratio differences
> of
> these early model Quattros ...so your question of whether or not they can be
> switched
> is probably no

All 4kq's ('84-'87) have the same final drive ratio of 4.11:1.
The difference has to do with the rear diff itself.
The smaller unit ('85.5 - '87) had smaller output flanges and therefore smaller
inner CV's.
Those smaller CV's are the same size as the front ones. Real useful for 5 bolt
conversions : ).
The '84-'85.5 used the same rear shafts and CV's as the Ur-q.
However there was a small change in the outer CV size on some late '87's.
The change had to do with alignment specs.  In order to provide more adjustment
the ball joint carrier got longer slots and the CV got smaller (but not the
splines).

HTH
--
Martin Pajak

http://www.geocities.com/MotorCity/5939

1982 Audi Coupe Turbo (475,000 km)
1982 Audi Coupe Quattro (155,000 km) Coupe with 4kq floor
1983 Audi Ur-quattro (220,000 km)
1986 Audi 4000 S Quattro (360,000 km) with 5 bolt pattern

C.E.O. of examlastminuteallnighterrollthedice inc.