speedometer adjustment

[Shazam456]

I have a 88 jimmy daily driver with 33" and the speedo is out by about 10mph Is there a kit or gear that can be changed in the tranny for the speedo cable? How do figure out what ratio?

 

[big83chevy4x4]

you need to replace the driven gear in the tcase, there is a little bolt and a retainer near where the speedo cable is hooked to. take that off pull it out and thats the driven gear.

i have had no luck trying to figure what gear is needed except for trail and error, took me 3 tries to get it right, then my cable broke

 

[Shazam456]

Thats a great help. Where would I find the gear? Is it a common part at most AutoPart dealers?

 

[1985_K5_Silverado]

This may or may not help:

http://www.tciauto.com/tech_info/speedo_gears.htm

 

[big83chevy4x4]

you could try a junkyard or a dealer, probably not gonna find it at a parts store.