The Ford Barn

j porter · 09-17-2013, 11:43 AM

Recently purchased speedster. Builder said it is 29 frame and 30 drive train. Having question of speedometer drive gear. It has 21 teeth. Is this correct or should I install 18 or 19 gear. I don't know why it has 21 teeth and how it will effect speedometer. help John Porter

Rowdy · 09-17-2013, 11:49 AM

It depends on what gear ratio the rearend has. Maybe with 21 teeth it has 4.11:1 gears. Rod

Tom Wesenberg · 09-17-2013, 12:17 PM

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Yep, what Rowdy and 1930 Coupe said, and if you do have 4.11 ring and pinion, I'll bet you would find the 3.27 gears much nicer to drive, especially with a light speedster.

09-17-2013, 11:43 AM	#1
j porter Junior Member Join Date: Sep 2013 Posts: 14	speedometer drive gear Recently purchased speedster. Builder said it is 29 frame and 30 drive train. Having question of speedometer drive gear. It has 21 teeth. Is this correct or should I install 18 or 19 gear. I don't know why it has 21 teeth and how it will effect speedometer. help John Porter

09-17-2013, 11:49 AM	#2
Rowdy BANNED Join Date: May 2010 Location: Gothenburg Nebraska Just off I-80 Posts: 4,893	Re: speedometer drive gear It depends on what gear ratio the rearend has. Maybe with 21 teeth it has 4.11:1 gears. Rod __________________ Do the RIGHT thing - Support the H.A.M.B. Alliance!!!!

09-17-2013, 12:17 PM	#3
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: speedometer drive gear Sponsored Links (Register now to hide all advertisements) Yep, what Rowdy and 1930 Coupe said, and if you do have 4.11 ring and pinion, I'll bet you would find the 3.27 gears much nicer to drive, especially with a light speedster.