Hey guys the speedo in my 91LX is messed up it just jumps around when the car is moving and doesn't read right ever lol. Question is, is this like a chevy where it would have a VSS on the tailshaft? or is it a different problem?

Thanks

There is a small plastic speedo gear in the tranny that could be worn out
and only catching some of the time or it could be partially unplugged
from the back of the cluster.

I'll check that stuff but even at 5km its jumping bouncing around 220 or wherever it feels like lol I'll check that gear out tonight. Thanks man

Wait and see if Big Nick chimes in he may know off hand.

HAd an Explorer that did that....used to fix it by spraying the speedo cable with silicone lubricant.....although, mine didn't jump around, it just kinda stuck at 80.

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Black 91 Mustang LX Coupe
2.3L Auto

Denonford 8250Ti
Focal Utopia 165W
Kicker SoloBaric 15" (round)
Rockford 301S
Memphis 75X2
JBL CSX200.1

YOu need a new speedometer cable. The lube wears out over time and the cable actually starts burning into the plastic cover from the inside which causes it to bind and release, which makes the speed jump like a mofo. Replace your speedometer cable, its a pretty straightforward job and can be done in an hour or so.
SS

I'll get on that this weekend Thanks!