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Old 02-04-2003, 06:27 AM
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Post gm 10 bolt series I.d.

I have a rear end out of a 1977 firebird, the code on the axel tube is "pj" can anyone tell me what series carrier this is? "series 3 or series 4"? it has a 2.41 gear and I want to install a posi with a 3.55 gear,but i don't want to have to change the housing. any help would be app. thanks Terry

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Old 02-23-2003, 05:06 AM
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As a general rule on the 7-1/2 & 7-5/8 GM posi units, with 3:08 or higher gears (2:73, 2:55, etc) it will be a series 2 carrier. With 3:23 or lower gears, (3:42, 3:73,etc) it will be a series 3. I haven't run across a series 4. If you are using GM gears, you need the right carrier to correspond to the gears. If you are using aftermarket gears, you can get thicker gears, or a spacer to make the lower gears fit on the series 2 carrier. Don't know of any way to make the higher gears fit the series 3 carrier though. Hope this makes sense!
MF
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Old 02-23-2003, 05:16 AM
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A 1977 rear would be an 8.5, if it has 2.41 gears in it now and you want 3.55's you will need either a new carrier or a ring gear spacer. FWIW I don't think anyone make a 3.55 for this rear so you'll need a 3.42. You don't need to change the housing, just the carrier or differential (whichever you choose to call it).

EDIT.....I just noticed you said you are installing a posi and gears, just order a posi to go with the gear ratio you get. All 8.5 rears get one carrier for for 2.73 and up gears and a different series for gears under 2.73. You have 28 spline axles as well.

[ February 23, 2003: Message edited by: Jason ]</p>
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Old 02-23-2003, 05:18 AM
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[

[ February 23, 2003: Message edited by: Jason ]</p>
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Old 07-03-2005, 07:47 PM
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I have a '74 Firebird with an open 3.08 rear end, and I'd like to buy a posi unit, as well as run 3.42 gears. I've found one posi unit that is a 28 spline and ran 3.08's as well. Would this one work with the 3.42 gears that I want to buy?
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Old 07-03-2005, 08:06 PM
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yes it will
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Old 07-03-2005, 08:16 PM
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Sweet, thankya much!
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