Thread: chevy 10 bolt identification Help

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could any one help me on this I have a chevy 10 bolt rearend and I dont know to identify if its a 8.5" , 8.2" or 7.5" how do you tell or what part do mesure?
thanks chris

thanks a lot It was a big help

You can also look at the two tabs at the bottom of the pumpkin.

If its a 7.5 it has "fangs" that look like little fang teeth. If its an 8.5 the fangs are like two littlel blocks.

Or if you don't understand my way, go to maliburacing.com then go to tech then "7.5" and 8.5" Rearend comparison" It shows the pics of the three and you can also tell the difference by appearence not just by measuring.

thanks thats great

ok I have identifyed that it is a 8.5" now I looked on the ring gear and found these numbers exactly like the one below what do they mean will they tell me the gearing

1 GM 398A828 13 40 1 81
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the (A) could be a 7 or a 4 couldent really see it very well
thanks chris

I don't know if those nubers will tell you anything or not, I just look at the ring and the pinion, they will have numbers stamped into them. eg: 12(on the pinion) and 41(on the ring gear)= 3.42 gear ratio. Just divide the pinion number into the ring gear number and round up.

Originally posted by chevyman
ok I have identifyed that it is a 8.5" now I looked on the ring gear and found these numbers exactly like the one below what do they mean will they tell me the gearing

1 GM 398A828 13 40 1 81
.-----------^
the (A) could be a 7 or a 4 couldent really see it very well
thanks chris

I'm thinking thats when they were made from the letter and the numbers. I could be wrong though

I'm a troll, ignore me.

ok thanks I have already determined that I have 3.08 by deviding the ring by the ipinon I figured out that the 40 and the 13 in the number was the amount of teeth it had on the gears but that way by marking the weel and drive shaft and tureing it is good to know I could use that in a junk yard when I dont want to take the cover off thanks