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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Re: 69 Chevy C20 rear end ratio?
 

I thought spin the tire one revolution, count how many times the driveshaft turns.

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

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

Re: 69 Chevy C20 rear end ratio?
 

That makes sense! Thanks a lot I couldn't figure out how to do it and it was making me mad:lol:.

I did that too but came out around the same.
O ya I'm subscribed to your build thread! You go into so much detail I've learned a lot.
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