10-06-2013, 03:40 PM | #1 |
Member
Join Date: Nov 2010
Location: Denver, NC
Posts: 44
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Speedo gear
I'm running 205/75R15 on my 50 Custom deluxe. What tooth speedo gear do I need to compensate? Thanks!
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10-06-2013, 04:05 PM | #2 |
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Join Date: May 2010
Location: El Cerrito CA
Posts: 338
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Re: Speedo gear
What is your rear end ratio ?
That's a pretty short tire. |
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10-06-2013, 08:14 PM | #3 |
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Join Date: Nov 2010
Location: Denver, NC
Posts: 44
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Re: Speedo gear
41 Picup, Thanks for responding. It's 3 speed w/OD. I believe the rear is a 3.73. The original tires were 600/16.
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10-06-2013, 09:50 PM | #4 |
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Join Date: Nov 2010
Location: NM
Posts: 2,438
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Re: Speedo gear
You may have to change the drive gear on the output shaft to arrive at a correct ratio. How far off is the speedo/odo now? If it's more than a few percent, you may want to correct it with an adapter in the speedometer cable. They are about $70, and install in minutes. http://www.speedometershop.com/ratio.html#ADAPT
PS -- Due to an axle ratio change, my truck is 9.5% off on the odometer. What I didn't realize until recently is that at speeds above 45 mph, my speedometer is off by 20%. So I need both an adapter and a recalibration. Worth spending a little time on the freeways with a stopwatch and pad of paper...
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'52 F-1, EAB flathead |
10-06-2013, 10:38 PM | #5 |
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Join Date: May 2010
Location: Mill Valley,Ca.
Posts: 1,509
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Re: Speedo gear
I recently took some one with a cell phone for a ride, she down loaded an app that gave the speed I was going- and confirmed that my speedo reads a bit fast...
I know the speedo drive gear is 18 tooth, for a 3.54 rear... So, maybe I'll take a while to decide if I want to change anything- fixing the speedo would be the obvious thing... Karl |
10-07-2013, 08:46 AM | #6 |
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Location: Bend, Oregon
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Re: Speedo gear
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10-07-2013, 09:03 AM | #7 |
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Join Date: May 2010
Location: El Cerrito CA
Posts: 338
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Re: Speedo gear
Is your speedo fast or slow?
205/75R15 = 27in diameter verses 600-16 =28.3 diameter |
10-07-2013, 12:08 PM | #8 | |
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Join Date: Dec 2010
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Re: Speedo gear
Quote:
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