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Old 04-09-2003, 06:43 PM
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Post S-10 rear end

Charles, thanks for the great info. Sounds like a 342 gear would fit me perfectly. Since I am running the same tires, the rpm's sound good to me. I am not very familiar with rearends, so could you tell me, do I need to change the entire rear end or just the gears or third member? How do I tell which rearend had which gear ratio? Is counting the revolutions very accurate? Would you have any idea what automobile would have the rearends that I could use? I know that I am asking a lot of questions, but I appreciate any help you could give me.

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Old 04-10-2003, 01:59 AM
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if your referring to the 7.5 rear commonly in S-10`s, you can get a posi unit from a firebird t/a or camaro Z28 from 82 to 87. I did this with my cutlass, I just swapped the guts. if this interests you, I have the codes of the F-body rear`s to look for, just let me know. another way to tell the ratio with the rear cover off, all GM ring gears have the numbers stamped on them, a example would be 41 11 divide these and you get 3.73.
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Old 04-10-2003, 02:22 AM
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a friend of mine has a s-10 with a 400sbc in it and he said he couldn't find any posi that would just fit into the rearend housing. i don't know if he is right after reading this but u say a posi out of a 82-87 camaro or firebird will work. so have u tried this or just saying it will work.
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Old 04-10-2003, 11:25 AM
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what year S-10? the 88 and up F-bodies came with a rear from Aussie, and I think the S-10 did the same, is why I said 82-87, if a S-10 pickup has a GM american 7.5 inch rear, the diff will swap in.
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Old 04-10-2003, 12:47 PM
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SLP sells off Zexel diffs for $100. A lot of S-10 guys drop them in. If I remember correctly, you need 28 spline axles and 3.23 or taller gears. It only fits the 7.5" and 7.625" rearends, not the 8.5".
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Old 04-10-2003, 12:52 PM
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Doublevision is correct about this swap. The American made S-10 rears and mid 80's camaro and firebirds are interchangeable
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