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12-15-2020, 06:18 PM | #1 |
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Join Date: Jul 2008
Location: kennewick, WA
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Speedometer reads WAAAAYYYYY Fast
I put a 700R4 into my 65 c10, I used the speedometer gear calculators found on various websites to determine the drive gear and the driven gear. Installed the gears the calculator said to use and now the speedometer reads about twice what it should.
My question is, do I need the speedometer gear reducer box found on the SM465 or does the automatic trans not use those? Posted via Mobile Device |
12-15-2020, 07:02 PM | #2 |
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Join Date: Jan 2011
Location: Hayes Va
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Re: Speedometer reads WAAAAYYYYY Fast
I just did a 700r4 conversion in a 72. Gray drive gear and blue driven gear. 373 gear and 28" tall tires.
Jimmy
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
12-15-2020, 08:15 PM | #3 |
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12-16-2020, 12:26 AM | #4 |
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Join Date: Mar 2018
Location: Colchester IL
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Re: Speedometer reads WAAAAYYYYY Fast
Mine had electric and converted it to mechanical using one of these. Nothing else needed but don't remember which color gears. 700r4 3:73 and 29" tires.
https://www.classictransmissionsolut...20%7C%20%24118 |
12-19-2020, 04:37 PM | #5 |
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Join Date: Jan 2013
Location: Calgary Alberta
Posts: 1,164
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Re: Speedometer reads WAAAAYYYYY Fast
Mine reads too slow as a result of changing from a 3.73 to a 3.07. It seems to work great up here though by doubling the MPH to get KPH. It hurt to drive at 15 through a 30 school zone but I didn't get stopped and on the return trip from the lumber yard he had someone else pulled over.
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12-19-2020, 08:24 PM | #6 |
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Join Date: Jan 2011
Location: Hayes Va
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Re: Speedometer reads WAAAAYYYYY Fast
Yes screwed it right to the transmission. You can easily change one to mechanical.
Jimmy [QUOTE=chev-obsession;8850417]Did you connect the speedo cable directly to the transmission speedo drive gear housing? Posted via Mobile Device[/QUOTE
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
12-20-2020, 02:05 AM | #7 |
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Join Date: Jul 2008
Location: kennewick, WA
Posts: 1,466
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Re: Speedometer reads WAAAAYYYYY Fast
Sounds good, I was just making sure I didn’t need a gear reducer like I had on the sm465
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1965 c/10 swb 1969 c/10 lwb |
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