Speedo gear help
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Posting Guru
Joined: Jun 2004
Posts: 1,092
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From: Casa Grande
Speedo gear help
Hey everyone
Does anyone know of a good calculator or chart to figure out what speedo gear I need?
Mine is showing 75mph while my GPS shows 65
It's a 85 F150 4X2, 4.9L with the 4spOD trans. The tag says axle code 17 with 215/75R tires stock. It now has 3.73, I think may be 3.55, and 31X10.50 tires.
It's not really a big deal but would like to get it corrected.
Thanks
Keith
Does anyone know of a good calculator or chart to figure out what speedo gear I need?
Mine is showing 75mph while my GPS shows 65
It's a 85 F150 4X2, 4.9L with the 4spOD trans. The tag says axle code 17 with 215/75R tires stock. It now has 3.73, I think may be 3.55, and 31X10.50 tires.
It's not really a big deal but would like to get it corrected.
Thanks
Keith
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Joined: Apr 2004
Posts: 34,504
Likes: 2,820
Funny, this sounds familiar:
https://www.ford-trucks.com/forums/1...do-i-need.html
Short version: get a driven gear 1 tooth larger that what you have.
https://www.ford-trucks.com/forums/1...do-i-need.html
Short version: get a driven gear 1 tooth larger that what you have.
