Switches on the 84 4k center diff
Mark J. Besso
mbspeed at maxboostracing.com
Sat Jan 17 14:07:00 PST 2009
That looks like the switch that senses when the car is in top gear to
prevent the upshift light from coming on.
On Sat, 17 Jan 2009 14:38:05 -0500
"Bares, Vittorio" <Vittorio.Bares at nuance.com> wrote:
I suspect all the attached pic's will get stripped for the forum list...
However, I removed the two switches and they are identical...they both
have a prong that is spring actuated.
I would tend towards the 5th gear hypothesis...
If you're interested in the pics - send me and email and I'll shoot them
From: Mark J. Besso [mailto:mbspeed at maxboostracing.com]
Sent: Saturday, January 17, 2009 2:16 PM
To: Louis-Alain Richard; Bares, Vittorio; Audifans
Subject: Re: Switches on the 84 4k center diff
IIRC, the UrQ didn't offer the option of locking the center or rear
differentials individually. You pulled one switch and they both locked.
The 4KQ & 5KQ allowed that to be done in two steps. You pulled the switch
half way out to lock the center, and the rest of the way out to lock the
Vittorio is trying to achieve a setup that allows individual locking of
center & rear diffs.
On Sat, 17 Jan 2009 13:12:44 -0500
"Louis-Alain Richard" <larichard at plguide.com> wrote:
I shoulda've know that you are able to distinguish a plug from a
I took a look to the 1983 urQ spare tranny I have here, and there is no
other switch on any part of the body. And there shouldn't be any... so it
probably an aftermarket switch. Do you have access to it ? Maybe this is
temperature switch that someone installed to monitor diff temp ? Or maybe
pickup point for a rally computer ? This would be a nice spot, less
by individual wheel speed.
Do you have a picture ? Maybe we can figure what's behind ?
Yes indeed that is the plug that is used to carry the diff lock cable.
#26 is also identified as the diff lock switch (oriented East to West on
the center diff).
However there is one more switch that is installed in a North to South
orientation - towards the top of the center diff, that is not identified
in any of the 4k - in fact they all look the same from the ETKA point of
The back-up light switch is further forward - just above the cv shaft
Anyone know what this unidentified switch does?
This part, item 25 from page 32-00, is not a switch. It is the attachment
point for the diff lock cable end, a sort of special bolt with a groove
for a circlip. Just zoom on the part, and you'll see.
There are 2 switches on the 84 4k tranny center diff - my ETKA tells me
one is NLA and the other is the diff lock indicator (shown as the upper
Anyone know what the lower switch is?
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