My speedo still bounces from 0 to??? 60-70 + mph. Checked the VSS, it's tight. Checked the wiring, no cracked, frayed wiring. Hum....

The other symptom is, the 4x4 light on the dash keeps coming on. I stop, pull the 4wd lever back engaging the trans case, I then push it forward to 2wd, the light goes off, a block or two later.... comes back on again! Then it sometimes goes on and off as drive...... grrrrrr!!!

A fellow member had mentioned that the wiring coming from the VSS splits and goes to the 4wd indicator light. I checked the wiring carefully and it all looks good. Is there anything other than the the square drive shaft in the VSS being worn that would cause the symptoms I am suffering?

thanks

David

 

Are you sure it is not the square drive? It took me several times of welding up the square drive pin and filing it down to get the drive not to slip. It is a tricky sucker

Dean

 

Dave, the drive shaft that goes into the tranny itself is a square, 'bout 1/8" shaft. this can round off and "catch and release" in the gear that turns it. That would be about the only thing I can think of other than an electrical issue.
With what your describing on the 4X indicator, I'd say you have a bad wire/connector somewhere there.

IF it is the drive shaft, you can:
1) pull it, clean it, and CAREFULLY fill it back in with JB Weld and then file it back to size..
2) place a 7/16" washer under the VSS or gear reducer to "lift" the shaft a little so that a square section is now in the drive gear...
3) replace it( $$$)

I would really recheck your electrical tho.. that 4X indicator lamp is a good sign you do have a problem in there.

 

"I would really recheck your electrical tho.. that 4X indicator lamp is a good sign you do have a problem in there"

That's what I am still thinking....electrical, but my neighbor across the street has a 91 w250 and he says that his light stays on all the time and his speedo works fine..hum, maybe his VSS is ok and he has elec probs and I have both issues.... (shrugs shoulders and ---> )

thanks guys

 

has the problem been solved yet? i am having the same problem.

 

I haven't had the time to dig into it, the dang turkey got out and I had to chase it cross two counties so's we'd have dinner tomorrow.....

I'll post what I find as soon as I figure out what the prob is.

 

Dave the final issue with the speedo can be the plastic drive gear that is inside the trans housing. It is about a 2" round plastic gear attached to a hollow shaft that the VSS/Gear Reducer drive slips inside of.
That plastic gear can strip off and start loosing teeth, causing intermittent engagement, resulting in a bouncy speedo or no speedo at all.
I would check everything else first tho, and if you do check the plastic drive gear, count the teeth and keep it for future reference.
These gears can run between $95 and 120 at th dealer....

 

Here's a Canadian selling them off eBay for $24 a pop + S&H:

http://motors.search.ebay.com/_W0QQsassZ69viper