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03-19-2012, 04:18 PM | #1 |
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Location: South Dakota
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69 Chevy C20 rear end ratio?
I have a c20 with a HO52 rear end if I'm not mistaken(compairing pics of them on here) and I went to figure out what gears are in the rear end. I did what I was told to do, jack up one tire, put the truck in neutral, an count the tire rotation and drive shaft rotation. For 10 tire spins the drive shaft spins 20.4 times. I did this with both tires an both got the same out come. I thought these rear ends came with 4.10 or 4.58 so how is possible? Did they make a aftermarket gear for these rear end? Any info would be great!
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1969 Chevy c20(Miss Hackjob) Last edited by treveiger; 03-19-2012 at 04:25 PM. |
03-19-2012, 05:33 PM | #2 |
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Re: 69 Chevy C20 rear end ratio?
I thought spin the tire one revolution, count how many times the driveshaft turns.
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03-19-2012, 07:54 PM | #3 |
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Re: 69 Chevy C20 rear end ratio?
If you only spin one tire then you have to multiply the number of driveshift spins by 2 as the drive shaft spins 1/2 revolution for each spin when only one wheel is turned.
So in your case you would multiply 20.4 x 2 = 40.8 then divide by 10 you end up with 4.08 which is very close to 4.10. Did you check to see if the tag is still bolted on with the one of the cover bolts? Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
03-19-2012, 10:02 PM | #4 |
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Re: 69 Chevy C20 rear end ratio?
There should be a two letter code stamped on top of the carrier that identifies the gear ratio. Mine was JU (4.10). I also counted revolutions to confirm and got a number very close to 4.10.
Here is a pic of mine for reference: http://67-72chevytrucks.com/vboard/s...8&postcount=39
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- Jim - My Daily Driver is a 1969 Chevrolet Custom/20 Fleetside 350/TH400/Eaton H052 4.10 and its Project thread is here http://67-72chevytrucks.com/vboard/s...d.php?t=456911 |
03-20-2012, 01:16 AM | #5 | |||
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Re: 69 Chevy C20 rear end ratio?
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1969 Chevy c20(Miss Hackjob) |
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