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Old 10-28-2011, 12:35 PM   #5
71sierragrande
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Join Date: Dec 2010
Location: San Diego, California
Posts: 928
Re: Package deal: BB, th400, 12 bolt posi...or ???

But I also have to upgrade trans and rear. I have a th350 and a non posi currently.
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1971 GMC Sierra Grande 2WD 1/2 ton, 350/400 auto
2008 Chevy Silverado 2WD 1/2 ton LT1 5.3L auto
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