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| | | | Joined: Nov 2005 Posts: 1,048 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 1,048 | Anyone have a good source for speedometer correction adaptor gears?? | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | http://www.speedometershop.com/rep-pag.htmI averaged odometer readings from 10 x 10 miles measured on an interstate at 60 mph. They made an adapter that has worked on both a stock 3-speed and a stock 4-speed - to within 1% accuracy. | | | | | Joined: Dec 2006 Posts: 1,464 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 1,464 | What kind of tranny are you using? How far is it off? Reading fast or slow? Are you sure you need an adapter? I corrected mine (T5) with a simple driven gear swap - just cost a few bucks. I've had good luck with the guys at www.thegearbox.org | | | | | Joined: Nov 2005 Posts: 1,048 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 1,048 | Thanks for the help guys.
I’m running the 41’s stock 4 speed, but have changed the ring and pinion from 4.56 to 3.38 I also have slightly smaller diameter tires. Over all I need to speed the speedometer up by 23%
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
I think that my adjustment was about 18% (3.55 rear conversion and ~31" diameter radial tires).
Finding a correct combination of drive/driven speedometer gears for an original 1941 4-speed transmission seems quite unlikely.
If the company listed by The Green Farmer can provide an adapter, its prices look to be very good (#54RA2 might have correct cable fittings). Give them a call. Ask if they can make an adapter for a specific % correction.
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