Speedometer drive gear help

[Bootz1385]

I have a 1986 Ford Ranger 2.9l Manual with a 3.73 gear in the rear. I dropped the tire size down to a 195/60r14. The speedo was way off as they had oversized tires on it. The worm gear is yellow and I am guessing it is stock, so 7 teeth. The speedo gear is red, so 21 teeth. From the calculator it looks like I need a 23 tooth as 2 teeth is normally 7 mph. Any one Know where I can get a 23 tooth for the ranger. I saw some on summit but they are for a t5. Thanks in advance.

 

[RonD]

You can get the 23 tooth white color speedo gear but they will wear out within 25k miles because the pitch of the gears can't match the 7 tooth drive gear
That's why there is a common range of only 16 to 21 teeth

Ford Speedo Driven gear would not be transmission specific just the Drive gear would be

Your transmission is a TK5?
You may be able to find a 6 tooth Drive Gear, it was black, better long term solution

 

[Bootz1385]

Thank you Ron D. You helped me through a engine issue last time as well. I have not looked at the trans to really identify it yet, just looked at the speedo gear and worm drive. I will look but am sure it is a tk5. I am going to order the white to get it driving and when I do the clutch will change the worm drive. Thank you again. You guys are more valuable than pro demand lol

 

[19Walt93]

Two teeth isn't 7 mph, it would throw everything off by a percentage. I'd drive between a few mile markers on the highway- or use GPS if you're able- and determine where you are now. Say it reads 55 at 50 mph, it's off 10% and you need a 10% bigger driven gear.

 

[racsan]

I got my speedometer gear assortment off of fleabay, not sure if it would fit yours as I have the M5OD.

 

[RonD]

The Driven gears are just Ford type so transmission model doesn't matter, manual/auto, TK5/M5R1, doesn't matter

The Drive gear on the tail shaft is transmission specific

 

[Bootz1385]

Thanks guys for all the help. I am 15 mph off according to my GPS. Got to make some big changes lol. The Calculators on here should get me the rest of the way. Thank you for all your help.