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Old 01-13-2004, 07:55 PM
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Numbers for a posi please

I have an 84 S10 extended cab with a 305 in it. Looking for a Posi rear end that I can swap into mine.

Any numbers you might have that would help me in locating one from the yards?


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Old 01-13-2004, 11:45 PM
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I have 7.5 rear with 3.08 gears.

Thanks again.
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Old 01-14-2004, 04:09 AM
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This has been popular this week, my 3rd posting of this kind.
Anyways, the F-body Firebird T/A and Camaro Z28 came with 7.5 rear just as your S-10 did. all you have to do is head to the junkyard and search one down. I have the same rear in my cutlass, I swapped the guts out. your S-10 came with a leaf spring rear likely, the F-body`s use coil springs, so swapping the whole rear is out, unless your handy with a welder and cutting torch, so swapping out the guts would be the easier route however, it must be done correctly. if you do this, make sure you add GM limited slip differential fluid, this will eliminate the chatter.
The code on the F-body rears will be on the passengers side front axle tube. the 88 and up F-body`s used a Aussie 9 bolt rear that won`t interchange. these codes are for limited slip (posi) diff`s only, the codes are as follows:

Year Code Ratio
1982 2JR 3.42:1
1982 2JY 3.08:1
1982 2JZ 3.23:1
1982 2PZ 3.23:1
1982 2PY 3.08:1
1983 4JQ/5JQ 3.73:1
1983 4JR/5JR 3.42:1
1983 4JY/5JY 3.08:1
1983 4JZ/5JZ 3.23:1
1983 4PQ/5PQ 3.73:1
1983 4PY/5PY 3.08:1
1983 4PZ/5PZ 3.23:1
1984 6EF 3.42:1
1984 6EP 3.42:1
1984 6JQ 3.73:1
1984 6JR 3.42:1
1984 6JY 3.08:1
1984 6JZ 3.23:1
1984 6PQ 3.73:1
1984 6PY 3.08:1
1984 6PZ 3.23:1
1985 8JP 3.08:1
1985 8JQ 3.23:1
1985 8PP 3.08:1
1985 8PQ 3.23:1
1985 8PR 3.42:1
1985 8PS 3.73:1
1986 2H5 3.73:1
1986 2HT 2.73:1
1986 2HV 2.73:1
1986 2HY 3.23:1
1987 2HQ 3.23:1
1987 4HF 3.08:1
1987 4HY 3.23:1
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