Any numbers on a posi rear that may work with my 81 el camino? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-12-2004, 09:19 AM
somethin4nothin's Avatar
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Any numbers on a posi rear that may work with my 81 el camino?

Any and all help is greatly appreciated. Any mods that I have to make?

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Old 01-12-2004, 07:10 PM
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Your El Camino should have the 7.5 inch G-body axle which will directly swap out with the following vehicles with either the 7.5 OR the 8.5 inch:


Buick: Regal 1978-1987
Chevrolet: Monte Carlo 78-88, El Camino 78-87, Malibu 78-83
Oldsmobile Cutlass: 1978-1988
Pontiac Grand Prix: 1978-1987
Including variant options (SS, CL, LS, Supreme, W30, Grand National, WE4, GNX, 2+2, etc...)
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Old 01-13-2004, 03:20 AM
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if you want a posi rear on the cheap and it is a 7.5, get one out of a 82-87 F-body. I did this and just swapped guts into the rear of my cutlass, it came with 2.14:1 gears, I swapped the guts over to a 3.23:1 limited slip diff from a 83 Firebird t/a. the codes are found on the front passengers side axle tube. the code for the F-body Firebird T/A and Camaro Z28`s are:
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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Old 01-13-2004, 11:32 AM
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Thanks,
Now the hard part...finding something worth the effort!!!
What should I look for when I find one? How do you tell if it's worth buying?
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Old 01-13-2004, 02:55 PM
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Yard Work

Most yards will rework the POSI for $100. The rest is fairly bullet proof. They should sell the center section with the rebuild for MAX $250. Doublevision gave you a great list. I copied it out for future use. Fax it to the yard of your choice and it will help.

hr41pearl
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Old 02-18-2004, 04:42 PM
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would you have to re-set up the gears or just keep the shims in the right place that they came from on the new rear end?
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Old 02-18-2004, 05:03 PM
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All Done

The junk yard here took my entire rearend and reworked it. I just had to re-hang it. If you can drive it down to them, they will do it there. Call around. Not a bad way to save money and it works great.

hr41pearl
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