12-Bolt rear
I have one in a 90 Suburban 5-lug. Will check on gears, but I think it is 3:42s. Louisville,Ky 
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Marty Hall
1971 K-10 LWB Cheyenne (461\T-400)
93 S-10 Blazer (330,000 and still going)
86 SS Monte Carlo (40,000 miles)
85 Chevy Scottsdale
02 Jeep Liberty
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