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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 80stepsideguy on November 10, 2006, 10:07:00 pm

Title: 12 bolt rearend question
Post by: 80stepsideguy on November 10, 2006, 10:07:00 pm

Question,
did all c10 trucks come with a 12 bolt rearend?The 2.77 rearend i got that was a original rearend to my truck is a 12 bolt.I was just curious on this because i got 3 rearends and 3 different ratios 2.77 a 3.42 and a 3.73.All are 5 lug  and all are truck rearends.Did people get a chance to choose a ratio from the dealership or was that part of the engine package when the truck was built from the factory?

thanks
pat

Title: Re: 12 bolt rearend question
Post by: Blazin on November 10, 2006, 10:08:00 pm

You could order ratios, but also a dealer that knew their stuff would have ordered specific ratios for specific truck uses to set on their lot.

Title: Re: 12 bolt rearend question
Post by: roundedline on November 10, 2006, 11:34:00 pm

If you were ordering the truck you could option just about anything you wanted including axle ratios.

73-81 came with 12bolts, 82-87(91) came with 10 bolts.  There is nothing significantly better in 12 vs 10 for a street truck.

Chris Lucas
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