Speedometer does not work!
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New User
Joined: May 2003
Posts: 13
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Speedometer does not work!
The speedometer got to be real bumpy before ceasing to function altogether, depriving me of seeing my 1987 F-150, 4.9 liter 6 cyl., go over the 200,000 mile mark. The meter still will work when downshifting and coasting down in gear.
I pulled the cable and it was not broken, leading me to think that it is the doo-dad on the rear of the transmission that needs to be replaced. What is this ring gear thing called, and what is involved in fixing it?
Thanks!!
I pulled the cable and it was not broken, leading me to think that it is the doo-dad on the rear of the transmission that needs to be replaced. What is this ring gear thing called, and what is involved in fixing it?
Thanks!!
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Speedometer does not work!
It's not really a 'ring gear' - that term is used for the large hypoid gear in an axle.
It's just called the speedometer gear; either the drive (on the trans/t-case output shaft) or the driven gear (on the VSS stabbed into the side of the trans/t-case). Pull the small bolt that retains the VSS in the casting and see what the driven gear looks like. If its teeth are worn off, replace it with one the same color (tooth-count). If they're OK, you'll have to pull the output yoke, snap-ring, and drive gear. You might find instruction with diagrams here.
It's just called the speedometer gear; either the drive (on the trans/t-case output shaft) or the driven gear (on the VSS stabbed into the side of the trans/t-case). Pull the small bolt that retains the VSS in the casting and see what the driven gear looks like. If its teeth are worn off, replace it with one the same color (tooth-count). If they're OK, you'll have to pull the output yoke, snap-ring, and drive gear. You might find instruction with diagrams here.
