SIIA Speedo

[rupertmja]

Anyone know why my speedo jumps around all over the place but settles down once I get to 30mph?

[slouzon]

Things to check.

1st...
Speedo drive cable, make sure it is lubed and spins freely and is routed though the chassis so it is not kinked.

2nd...
T-case output shaft nut, under where the rear drive shaft mounts to the T-case output flange in the center of the emergency brake. Make sure this nut is tight.

3rd...
If all the above checks out I would get a good used speedo and try it.


4th...
The speedo drive gear housing which also retains the T-case output bearing preload can be checked and adjusted if needed. Get out the "Green Bible" for this procedure. Unless your T-case is worn out or someone rebuilt it incorrectly this should be OK.
I have heard that some guys will just remove one of the thinner shims that adjust the bearing preload and see how it does. I would be concerned about putting to much preload on the bearings doing this and than needing to rebuild the T-case in short order.

Mine ended up needing a speedo but mine was jumping around from 0 to 70+ no matter what speed I was going.

[michaeltw]

If you do need to send them out, check out http://www.nisonger.com/

They did a great job restoring mine.