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Old 11-11-2003, 05:47 PM
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7.5 GM Differentials

I've got an '86 ElCamino with a 7.5 rear end. I suspect the current gears are around 2.7. I can obtain another 7.5 rear from a Cadillac that has 3.42 gears. My plan was/is to remove the 3.42 gears and install them in my case.
My question is whether or not my current axles will fit the other rear end, spline-wise.

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Old 11-11-2003, 05:53 PM
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I`m not real sure but think they would, if the caddy rear is the basic GM 7.5, if it`s the Aussie 7 5/8 they won`t interchange. when I did this to my cutlass, I got the rear from a 83 firebird t/a with 3.23 gears and posi, all i did was swap the guts from it`s rear to mine, I have the F - Body rear codes if your interested in doing this swap. years are 82 - 87, afterwards the F body mostly used the Aussie rear.
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Old 11-11-2003, 07:29 PM
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Double,

Now you've got me worried. Were there certain years for the Aussie rear end? I was hoping to just swap the "pigs". Just in case what #s should I look for?
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Old 11-11-2003, 09:13 PM
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the aussie rears have 9 bolt covers, this is one distinct give away. as for rear end codes, I don`t have any for the caddy, and all I have of the F - body rears are the positraction codes, I went junk yard hunting and it didn`t take long to find a rear, I only looked at 32 cars before I found one lol. the haynes manual at any local book store or parts store on the 80`s line F - body`s give the codes for both locking and non locking, so if you just want a gear swap, this would be the easier way. most posi`s will have the tag on the rear "use Limited slip fluid only" which is some stuff you have to buy from GM, it`s in about a 6oz bottle, it`s just anti chatter lube, I tired part store anti chatter lube and it didn`t work. anyways, the codes on the F body rears will be on the passenger side front axle tube, 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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Old 11-12-2003, 07:22 AM
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Thanks Double.
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Old 12-28-2003, 03:26 PM
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Don't even attempt to change the gears... i fried my posi unit im my El Camino and can not get it back together. There are preloads and measurements that need done... you also have to shim this thing if it fits right. Here is the best advice I can give you, HAVE A SHOP DO IT!!!
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Old 12-28-2003, 03:31 PM
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It is a tedious job and must be done correctly, but if you have access to the tools and knowledge, it can be done at home. Of course, I have been working on my cars for 35 years and have never set up a set of gears. I bought a dial indicator at a garage sale a few years ago, but have never used them, for rear ends anyways.
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