S10, Late Model Camaro/Bird 7.5 Posi fit G-body rear end? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-24-2010, 12:36 PM
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S10, Late Model Camaro/Bird 7.5 Posi fit G-body rear end?

S10, Late Model Camaro/F-Bird 7.5 Posi fit G-body rear end?

My brother has a 79 Malibu with strong running 350 and 3:42 gears but its a peg leg 7.5. Will a 7.5 s-10 or 3 or 4th Gen camaro, firebird posi work?

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Old 02-24-2010, 01:30 PM
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The 7.5 used 26 spline axles up to '89 or '90, then they went to 28 spline axles. You will need a 26 spline unit for the '79 Malibu. The 7.5 uses a 2 series differential for the 3.08 to 2.41 gears and a 3 series differential for the 3.23 to 4.10 gears. You must know what gears you have before getting a differential for it. The S10 uses a Governor Lock limited slip (posi) , which is a weak unit and should not be used in anything other than a stock S10. The 3rd gen Camaro used the Governor Lock and the Auburn. The Auburn is not a good differential to use if it is used. They aren't great when they are new and they go bad pretty quick when you abuse them. They can not be rebuilt, so when they are worn out they are scrap metal. The 4th gen Camaro used a 28 spline axle, so that leaves you out all together. They used the Auburn for the LT1 cars and the Torsen for the LS1 cars. The Torsen is worth having, but again, they are 28 spline. Your best bet is to get a new 26 spline Eaton Posi. It will hold up well and it works well. If you can wear it out then you can rebuild it. I doubt that you will wear it out.
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Old 02-24-2010, 02:48 PM
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Well the malibu is a weekend warrior and will see 50/50 street-strip duty. The other cheap alternative is to use a mini-spool. Summit sells them for just under $100. I know it will suck going around corners but this is a budget deal.
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Old 02-24-2010, 04:51 PM
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Using a spool on the street is a bad idea. I have personally seen my customers break axles, break all of the studs off of the axles and break wheels from using a spool on the street. I will no longer install a spool in any car or truck that will be used on the street. They are dangerous, and not just because they make the car handle bad, but they break parts. If you lose a wheel while driving down the road you are in big trouble.
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Old 02-25-2010, 08:46 AM
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Big Gear Head is correct, I have seen axles brake from running a spool on the street. You nail it in a slight turn or go around a curve to hard it can and will snap the axle off. Any street car i run if it has a spool in it when i get it i remove it. A matter of fact i have two 9 inch spools now laying around the garage that i pulled out. They are design to go fast and straight.JMO


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