Speedometer question

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7900_Blazer

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Location
Texas
First Name
Francis
Truck Year
1975
Truck Model
Blazer
Engine Size
350
What would cause the speedometer to only start working at say 30 or so.. and jump around and at 60 mph, it only shows 45 or 50?

Is it most likely:
1. the greased up super dirty speedometer cable
2. something in the transfer case
3. the gauge?

Thoughts?
 

squarelyfe

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Location
NORCAL USA
First Name
Larry
Truck Year
1975
Truck Model
k25
Engine Size
350
Probably a partially worn speedo gear, inside the tail shaft. It's plastic and wears out. Could also be worn at the other gear that enter from the side.
 

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