Gearing / speedometer question
#1
Gearing / speedometer question
Ok guys,
I have the Ford N Benz on the road and running well.
The Jeep AX-15 came with an electronic speedometer output, and the Ford uses a mechanical speedometer. I talked to a guy at a speedometer shop and he told me I would need a 35 tooth long shaft gear, and the correct holder, based on a 3.47 rear gear ratio, and 215 70R 14 tires which the tire calculator says are 25.85 inches tall.
He wanted about $260 for the gear, holder, and a new cable.
I found the gear and holder on ebay for $24, and got a speedometer cable from the local junkyard for $15.
When my speedometer on the dash says 60, the gps says only 57. When it reads 70, the gps says only 66 mph. So if I am reading 3 mph too fast at 60, do I need a gear with more teeth, or less teeth to correct it? I suppose I could just go with slightly larger tires, but there are still a lot of miles left on these, so that will be a while.
Thanks for your help.
Rick
I have the Ford N Benz on the road and running well.
The Jeep AX-15 came with an electronic speedometer output, and the Ford uses a mechanical speedometer. I talked to a guy at a speedometer shop and he told me I would need a 35 tooth long shaft gear, and the correct holder, based on a 3.47 rear gear ratio, and 215 70R 14 tires which the tire calculator says are 25.85 inches tall.
He wanted about $260 for the gear, holder, and a new cable.
I found the gear and holder on ebay for $24, and got a speedometer cable from the local junkyard for $15.
When my speedometer on the dash says 60, the gps says only 57. When it reads 70, the gps says only 66 mph. So if I am reading 3 mph too fast at 60, do I need a gear with more teeth, or less teeth to correct it? I suppose I could just go with slightly larger tires, but there are still a lot of miles left on these, so that will be a while.
Thanks for your help.
Rick
#4
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