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Old 08-18-2003, 07:55 PM
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3.08 rear-end

Does anyone here have any clues on where to find a GM posi 3.08? (If they made that ratio). Tired of waiting around at junk yards.

Thanks.

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Old 08-18-2003, 08:10 PM
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Need more info, 10 bolt? 12 bolt? what year? 7.5? 8.2? 8.5? what vehicle?
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Old 08-18-2003, 09:12 PM
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it does'nt matter, I need the whole read-end unit as a drop in replacement for an 87 olds. I will not be using the original case. anythign 7.5 or up is good and it needs to be posi, I've having a hell of a time finding one. Coil spring BTW
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Old 08-18-2003, 10:05 PM
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all I did to my rear was get the rear out of a 83 firebird trans am that had 3.23 gears and posi, and swapped the guts from it to my rear. the 82 to 87 camaro Z28 and firebird t/a`s were optional with posi, but I have the codes to all these rears that tells the ratio as well as if it`s a posi. my 86 cutlass came with 2.14:1 gears, they had to go. if you want the codes let me know and i`ll post them, if you go this route, you`ll also need GM posi lube to keep it from chattering, but it`s the cheapest way out.
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Old 08-18-2003, 11:52 PM
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Codes is a good first start
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Old 08-19-2003, 12:30 AM
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why do you want a 3.08? for milage there are better gears... for performance there are better gears... most people who want both go with the common 3.23s or for a quicker take off 3.73s
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Old 08-19-2003, 01:51 PM
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Well. First I got 2.41's at the moment, and I would keep them, but they are not posi. A 2.73 posi would be nice but I'm looking more for a 3.08.

The point is I dont want to top out at 100-120 mph like with those 3.73's, 4.1's, etc. I like the high speeds better, and now that I have a powerplant that can get me up there, i want to exploit it! BUt I also dont want to be a dog off the line, so 3.08's sound nice to me.

I took a trip down to north carolina when I went to pick up another cutlass, and the trailer we were driving in was pushing 3000RPM at 75mph! This is with a 4.11 and in the last gear, forth (.7 something) Being a 454 it ATE FUEL! Cost about $80 to go 5 hours down and 5 hours back.

thanks
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Old 08-19-2003, 04:47 PM
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442, the 3.08 sounds like a good gear for you, especially if you have a 200 or 700R4 with the lower 1st gear. I just finished having a 3.08 built up in a 10 bolt rear : every thing new and it was $1000. I am not into putting rear ends together and taking them apart to get them set properly. But the labor is not the big price: it's the posi unit if you can find one. It will be nearly half the bill. The new ring and pinion and bearings will run about $300. But when it is done, it is warranted and should not make a peep!!

Trees
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Old 08-19-2003, 08:48 PM
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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
keep in mind the 88 and up firebirds and camaro`s came with a rear made in aussie, there 7.5/8 I think, they won`t interchange with the 7.5, the code on the rear will be on the front passengers side axle tube.
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Old 08-20-2003, 09:20 AM
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3.08 rear end

The 59 GMC hydomatic pick up has an option of a positraction unit with 3.08 gears. I put one in my 56 Chevy pick up it was a bolt in except for the brake line. If you can find one of these rear ends you would have to change the spring perches but thats not a biggy. Also will require drive line rear yoke mods also not a big deal.
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Old 08-28-2003, 12:59 PM
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3.08 Rearend

This is my first post to any forum, although i have gained an incredible amount of information from them... and this one.

To answer your question, all Chevrolet Caprice police cars have the 3.08 gears. the really easy way to see if it has been in the junk yard the whole time you were waiting is to look for the following:

1994-1996 Chevy Caprice (Caprice Classic) or Impala SS

Look at the trunk SPID numbers for 9C1 (which is the SEO number for police options.)

the rear end on that vehicle will have a 3.08 gearing.

Hope this helps!

James
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Old 08-28-2003, 03:17 PM
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Have you checked www.car-parts.com ? ...Jay
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Old 08-28-2003, 05:39 PM
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i got a 3.08 for a 12 bolt posi in my chevelle im taking out if you want it we can talk prices e-mail me at dustinh2988@msn.com
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Old 08-31-2003, 04:31 PM
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3.08 rearend

I have one if you dont have one.
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