Questions about NP231 vacuum switch

Joe Pete

Questions about NP231 vacuum switch

by Joe Pete » Tue, 02 Sep 2003 04:39:37

I believe the T-case I have in my s-10 is an NP231. Although it's a
'96, it is not electronically shifted. There is a shift-lever on the
floor, that operates a cable running down to the T-case. I have a
question about a strange switch and what appear to be vacuum lines...

There is a small switch that screws into the top of the T-case. It is
roughly the size of a knock sensor, for comparison. At one end of this
switch (the end inside the case), there is a spring-loaded steel ball.
At the other end, there are three vacuum fittings, and vacuum lines
running up to the engine compartment. Does anyone know what the hell
this is, and what it does...


Questions about NP231 vacuum switch

by shiden_ka » Tue, 02 Sep 2003 04:58:24

"Joe Peters"  wrote

When you shift into 4 wheel drive, this switch applies vacuum to
a vacuum actuator sitting under the battery which in turn shifts
the front axle into engagement thru a cable.



Questions about NP231 vacuum switch

by AZGu » Tue, 02 Sep 2003 14:04:42

How hard was it to push the steel ball in to switch the switch??
Sounds like a part I could use for a different purpose if it's not too
hard to push in the ball.