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I have an 02 silverado 2500HD with 200,000+miles on stock Allison 1000 series trans , with a mild EFI HP ugrade sometimes i get a heavy foot and trans goes into limp.So i found a donor Allison 1000 PK just wondering if anybody could tell me the difference between the 1000 SERIES and the 1000 PK ,is it the valve body?
 
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