My truck has 245/75/16 tires in place of the stock 235/##/## tires. I have extra wheels and my brother is giving me the 265 firestones of his Z71. My truck has a 21 tooth speedo gear (plum color). The speedo is off 6%. By my calculations, I need both a 19 tooth and 20 tooth speedo gear to cover both tire sizes. Does any one have these part #'s. My dealer seems unwiling to help me find these gears despite the fact that I pulled the gear and drew them a blueprint.

They want to sell me a $50.00 speedo recalibration. The parts guy told me the gear won't change the speedo reading. I know better-garbage in = garbage out. This sure seems like a "make work" situation from the Ford on down thru the dealer.

Thanks

 

what year truck do you have?

 

It is a 97.

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97 XLT S/C Long Bed 2wd, 4.6 Romeo, 4R70W Trans., 3.55 LS, 192,000 miles

 

Bent 6
Your part #'s are:
c8sz 17271 b = 20 tooth orange
c7vy 17271 a = 19 tooth tan

Web address to determine this is http://www.finer.com/Internet/pages/speedo.htm

I might have an extra 20 tooth to get rid of for $5.00
Good Luck
Todd

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1998 F-150 SC Flareside 4.6 Wht/Grey Auto
Additions: Line-X 8-31-99
4.10:1 Pro Auburn, Custom made cold air induction system, Flowmaster exhaust, N2O (when needed)
Epic Lakota Chrome wheels and 285-75-16 Bridgestone Dueler AT (no lift and no rubbing at all) tires.

 

Mine was 20 teeth with a right-hand slant; it was black. Not trying to stir it up, but maybe the table isn't correct?

 

TJohnston,

Those are the right numbers. The gears list for $7.23. Wholesale was $5.42. My favorite parts guy at our local dealer found the gears using my drawing and the Ford speedo gear book even though there is no listing for the 97 and up F-150. I installed the 20 tooth, and now my speedo seems to be dead nuts. Thanks for your reply.

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97 XLT S/C Long Bed 2wd, 4.6 Romeo, 4R70W Trans., 3.55 LS, 192,000 miles