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Jan 21st, 2020
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 Re: Speedometer drive gears
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Joined: Apr 2005
Posts: 1,798
Shop Shark
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I have one of the aforementioned speedometer ratio adapters but I have no idea what ratios it changes. It is made by Stewart-Warner with the following numbers: 668F S12 1 2020 X. If anyone knows how to decode these numbers it may be usable to somebody.
I have no use for it so if someone is interested you can PM me.
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
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Re: Speedometer drive gears
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Joined: Dec 2015
Posts: 300
Unconventional Thinker
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Way back when, I swapped in a Dana 60 with 3.54 gears, and the truck came with 4.57 gears. The speedometer read 65 but I was doing at 80. I used the tachometer to know what the speeds were, and created a chart for when I tried a different tire size, so I knew what the new rpms were reading at specific speeds. I also didn't know about speedometer adapters back then, so there is that...lol...
Shane
Shane's Toys...
2007 Forester XT Limited (2nd Owner)
1991 Cherokee Laredo (2nd Owner)
1981 Chevy 3/4 Ton Fleetside 8,600 Camper Special (3rd Owner)
1965 Chevy 3/4 Ton Fleetside (3rd Owner)
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Re: Speedometer drive gears
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Joined: Sep 2011
Posts: 795
Shop Shark
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I have one of the aforementioned speedometer ratio adapters but I have no idea what ratios it changes. It is made by Stewart-Warner with the following numbers: 668F S12 1 2020 X. If anyone knows how to decode these numbers it may be usable to somebody.
I have no use for it so if someone is interested you can PM me.
Fred Look for a decimal point. Have 2 in front of me, .7333 (1 : 0.733) & 1.2020 (1 :1.20). I've us a GPS speedo app on my phone. Drive 50 mph by digital speedo app, indicated speedometer reading above or below GPS X 2 = % needed read correct.
BC
1960 Chevy C10 driver 235 T5 3.73 dana 44
1949 GMC 250 project in waiting
1960 C60 pasture art
G.M dealer tech since 1980 & counting
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Re: Speedometer drive gears
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Joined: Feb 2016
Posts: 440
Shop Shark
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I can recommend Bobs speedometer shop, I took a speedo and tach from my Vette to him, he fixed me up while I waited.
1957 Chevrolet 5700 LCF 283 SM420 single speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto
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Re: Speedometer drive gears
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Joined: Apr 2005
Posts: 1,798
Shop Shark
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Thanks BC, there is no decimal point but it's old. The 1: 1.20 is logical for the one I have.
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
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