Ford Motor Sports Speedometer gear recommendations needed

[DocMel]

Im running a new Keisler.  It currently has the orange speedo gear.  Problem is that my Speedometer reads 50 mph when I am actually traveling 62 mph.

Could anyone recommend the teeth/color speedo gear I need to get my actual speed readings closer to being accurate? 

[Chryco Psycho]

your speedo gear has too many teeth & is turning too slow , you want approx 18% less teeth , not sure how many you have now though

[DocMel]

Chryco

I now have 19 gears  (I actually have the pick gear at 19 teeth, not the orange gear)

So I am assuming, if I need 18% lees total teeth, the math basically ends up to 17 teeth? now needed 

[Chryco Psycho]

By my math you need the speedo to turn more than 20% faster so 50 x1.2 is 60 mph so if you reduce the tooth count by 20 % would be 3.8 teeth you want it to turn a bit fasterthen that so I would start with 15 teeth

[DocMel]

Right   Got ya, thanks.  All the websites appear to have the 16 teeth as the smallest available.  I may have to go with a 16 and bear with it

[brads70]

I have a keilsler kit and my speedo is off by about 20 mph too. Could you post a picture of the gear ? Mine was black?

[Travis72]

Use this calculator with your tire size and gear ratio:

http://www.5speedtransmissions.com/calculators.html

Brad, this is what the gear looks like along with some of the various size options:

http://www.ebay.com/itm/5-FORD-SPEEDOMETER-GEAR-MANUAL-TRANSMISSION-/221080239706?pt=Motors_Car_Truck_Parts_Accessories&hash=item337968be5a&vxp=mtr

Travis
72 Cuda

[brads70]

Use this calculator with your tire size and gear ratio:

http://www.5speedtransmissions.com/calculators.html

Brad, this is what the gear looks like along with some of the various size options:

http://www.ebay.com/itm/5-FORD-SPEEDOMETER-GEAR-MANUAL-TRANSMISSION-/221080239706?pt=Motors_Car_Truck_Parts_Accessories&hash=item337968be5a&vxp=mtr

Travis
72 Cuda

Thanks ! That's it!  I think I'll just buy the e-bay gears instead of dealing with Keisler again. 

[DocMel]

Thanks Chryco.  I placed in the 16 tooth, and all is spot on   $8 fix

[Chryco Psycho]

Awesome 

[brads70]

Thanks Chryco.  I placed in the 16 tooth, and all is spot on   $8 fix

   Thanks for posting this other wise I never would have know what the speedo gears were from!

[brads70]

Use this calculator with your tire size and gear ratio:

http://www.5speedtransmissions.com/calculators.html

Brad, this is what the gear looks like along with some of the various size options:

http://www.ebay.com/itm/5-FORD-SPEEDOMETER-GEAR-MANUAL-TRANSMISSION-/221080239706?pt=Motors_Car_Truck_Parts_Accessories&hash=item337968be5a&vxp=mtr

Travis
72 Cuda

Thanks again Travis and DocMel    I bought that kit in the e-bay link , just installed the pink one so I hope it's all good now! Going out to a local cruise night tonight to test it out!

For the record Keisler modifies/welds the tailstock in there auto OD A-41 kit and used Ford manual speedo gears. ( thought I'd mention that if someone down the road is searching the net for info)