You DO NOT replace the speedometer gear when changing the speedometer. The speedometer gear is only changed when changing the rear end gear ratio or tire size. Put the original gear back in.Well, I just replaced my 85 MPH speedo with a 140 MPH speedo. But now I'm having problems getting it to read right. I changed my original 18 tooth gear set to a 23 tooth gear set and it didn't fix the problem. And when I took the 23 tooth gear out today, the gear teeth had been broken while inside the trany during that short period of time. Has anyone worked on their speedo before and experienced something similar to this and found the fix to the problem? Cause I'm clueless at this point....
You DO NOT replace the speedometer gear when changing the speedometer. The speedometer gear is only changed when changing the rear end gear ratio or tire size. Put the original gear back in.
That shouldn't happen. The 85 mph, 140 mph, and 160 mph speedometers all work on the same standard input -- 1000 rpm/mile. Swapping one speedometer for another is all you have to do.I didn't change the speedo gear right away. I only changed it after I went down the road for a test drive to see how the new speedo worked and it was telling me I was doing 130MPH when I was actually doing about 45 MPH. If it isnt the gear set then what would cause that? The 85 MPH guage worked perfectly before I put in the 140 MPH guage.
Ouch! I hope you didn't pay too much for it.No, it was a used unit. So I guess that unit is broken then. Thanks for the input....
It's possible. The speedometer is a pretty sensitive instrument -- only driven by a small magnetic field and a light spring. Changing the balance of the needle could throw it off quite a bit.The used speedo I got didnt have the little black cap that goes on the needle. When we attempted to use the black cap off of a tachometer that wasnt being used it would read funny because the cap had a little weight in the back of it. Could the speedometer be messed up cause of the little black cap being gone?? If anyone has one laying around, do me a favor and pull off the black cap on the needle and look to see if there is a little chunk of mettle in it, please....
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