Ray, there is a certain amount of slack in the system: 2-U Joints,
Differentia, 2-CV Joints. When the VC engages, all of these connections
suddenly take up the slack. On our Syncros, this can sound like a clang or
single loud clunk. So far, I've assumed that this is normal.

Just what R&R work did you do on your VC? This is more than an idle
curiosity. The VC on out Westfalia is gone completely. I was counting on
Derek Drew and his group purchase arrangement for a new unit. Until that
finalizes, I'd like to try to squeeze some more life from the old unit if I
can.
-Larry
'86 Syncro Double Cab (VC works)
'86 Syncro Westfalia (VC dead)

"Mr. Perry" wrote:

> I just R&R'd my viscous coupling in my 90 syncro.  Sure is great to get
> this working, but... I hear a "clunck" when the mechanism engages (when
> rear wheel slips, or I turn shaply).  Is this typical?  I am wondering
> if this noise is coming from the CV joints.  Thanks in advance.
>
> Please P-mail me at this address.
>
> Ray