There are two plastic gears involved,,the drive gear and the driven gear. The driven gear is simple to change, the drive gear is a little more work. My guess is your cable is at fault. If you want to check the condition of the gears you can back up on to a pair of ramps or jack up and secure the rear half of the truck with jack stands. By lifting the rear up instead of the front you won't lose much, if any ATF. Disconnect speedo cable from trans, remove the bolt and the clamp that holds gear housing into trans and gently pull unit out from trans. Make note of the position of gear housing in relation to the clamp for reinstallation. This will get you to the driven speedo gear. The drive gear requires removing the driveshaft, then the tailshaft extension housing from the trans. This will expose the drive gear,,which is removed by releasing a spring clip and sliding the gear off the output shaft.
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1971 C10 swb stepside 350/700R4/3.73posi
Killingworth, Connecticut
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1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03)
1998 S10 short bed
2002 S10 Blazer
1942 Oldsmobile
1958 Massey Harris Pony
1951 Wife
Killingworth, Connecticut
May those who love us, love us, any of those who do not love us, may God turn their hearts.
And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping.
A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.
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