[s-cars] V8 Torsen rear

[Joe Pizzimenti]

Robert Rossato, Mythbuster.

On 2/24/06, Robert Rossato <r0ssat0_987 at att.net> wrote:
>
> Sorry but that's just wrong.  There are two different types of V8 rear
> diffs.  An AFV and AXZ.  Both have a 37:9 (4.11:1) crown and pinion.
> The differences between the two are in the Torsen itself, not the gear
> ratio.  Don't know what the actual difference in the Torsen is, but the
> AFV is the early type used on the '89 & '90 models, with '89 being
> Europe only, and only used on automatic transmissions.  The AXZ was used
> on manuals in all years, in extended wheelbase V8 automatics starting in
> Jan '90, and all automatics after the start of the '91 MY.  The AFV,
> besides the actual stamping, is externally distinguishable from the AXZ
> by the location of the top vent.  On the AFV the vent is at the top
> center of the casting and there is a hole in the casting for it.  On the
> AXZ the vent is moved over to the left flange side of the casting, and
> is naturally a little bit lower down.  Whether the relocation of the
> vent has anything to do with the change in the torsen itself, or is just
> coincident, I don't know.  But they BOTH used the same 4.11 to 1 gear
> ratios.
>
> Any year V8 rear diff will work.
>
> Bob
>
> > -----Original Message-----
> > From: s-car-list-bounces at audifans.com
> > [mailto:s-car-list-bounces at audifans.com] On Behalf Of Dave Forgie
> > Sent: Friday, February 24, 2006 1:48 AM
> > To: s-car-list at audifans.com
> > Subject: [s-cars] V8 Torsen rear
> >
> >
> > Beg to differ, IIRC, there was also a 3.89:1 rear diff for early
> > automatic V8s.  We need 4.11 to 1  Best to confirm the turns it takes
> > either by turning the input shaft and counting the output
> > turns or vice
> > versa.  If it is tad MORE than 4, then you have the right one; under 4
> > its the wrong one.  The consequences of installing a 3.89:1 diff are
> > very very bad.
> >
> > Count once, install once.  Forget to count, install twice.
> >
> > Dave F.
> >
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