Rear end swap ?

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pontiacgp

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Mar 31, 2006
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Supposedly out of a late 70's monte carlo . Is there any issues with this rear working in my 86 carlo ?

For an A body rear you want a Chevelle 64 to 72. The 64 - 67 A body rear is 2.5" wider than a G body rear, the 68 - 72 A body rear is 4.5" wider than the G body rear.
 
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lilbowtie

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Ill have close to 350 hp. But yeah ive thought about that, ive never worked on a differential , except for the basics. This is a budget build after the money i put in the th350. Id like to swap whole rear but idk, ill decide after i get engine and trans installed. Thanks

I think you would be surprised how easy a dif is to work on. An A body rear might be cheap but will probably require new rims and arms and shortening your drive shaft. You could use that Z rear end and buy new axles or find some used. There is always the ford 8.8 or 9 in all not cheap. Your most economical route is to find a 7.5 posi rear, they use to be cheap but are drying up, or buy a used posi for yours (no gov lock- watch carrier size). 350HP is starting to push the 7.5 and your talking about parts over 30 years old.
 
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pontiacgp

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another possibility is to try to find the 7 5/8 posi carrier that uses 28 spline axles
 
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wvjaybird

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For an A body rear you want a Chevelle 64 to 72. The 64 - 67 A body rear is 2.5" wider than a G body rear, the 68 - 72 A body rear is 4.5" wider than the G body rear.
Actually its out of a 76 monte , its 61" wide. Prob too wide for my 86, i gotta measure mine so i know exactly what i got
 

pontiacgp

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if it is a 61" rear that is 3" wider than the G body 58" rear. You should check the bolt pattern for the wheels, it may be a 5x5
 
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Ribbedroof

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I'd bet that 61" is backing plate to backing plate, not WMS to WMS

Surely if it was only ~3" wider than a G body, they'd be a lot more popular swap than they are, even with the mounting ear differences. 73-77 axles were always everywhere for cheap
 
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