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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Speedometer inoperative

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Old Aug 22, 2015 | 08:30 PM
  #1  
loveless41908's Avatar
loveless41908
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From: Montana
Speedometer inoperative

Verified cable and gauge good.
Plastic gear seems fine.
Any ideas?
 
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Old Aug 22, 2015 | 08:54 PM
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There is a worm gear on the shaft of the transfer case or transmission. It must be missing or something is wrong with it.
 
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Old Aug 29, 2015 | 05:37 PM
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Is your cable one piece or two? If two then definitely check the lower end by the tranny.

Mine broke there (after I removed the plastic gear, I noticed the broken cable) & I think the cruise control module seized on me.

Good luck Bro
 
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Old Aug 30, 2015 | 08:49 AM
  #4  
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TWO different speedometer gears:

Metal or nylon DRIVE gear on the output shaft / Nylon DRIVEN gear on the end of the cable.

Inside the speedometer cable housing is a woven steel core that's supposed to be lubed every so often. When the lube dries out, the core binds up inside the housing, eventually snaps.

Auto parts stores sell a universal woven steel core kit. Cut it to length, coat with a fine film of graphite, install in the housing.
 
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