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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: TexasRed on May 16, 2011, 08:04:24 pm

Title: Rear diff compatibility
Post by: TexasRed on May 16, 2011, 08:04:24 pm

Here's the issue, I have a 84 sierra classic (c1500) with 2.73 rear end and I'm trying to locate a whole assembly with either a 3.42 or 3.73 rear end. Is that possible or am I stuck with swapping out what I have? Did anything come stock that'll be a direct bolt in for my application with those ratios?

Title: Re: Rear diff compatibility
Post by: VileZambonie on May 16, 2011, 10:25:22 pm

Any C10 or C15 73-86 R10 87 will be a direct bolt in. The 81 up will most likely be a 10 bolt while the 1980 down will typically be a 12 bolt which will require a conversion U-joint. The brakes may be different as well. Typical ratio's are 2.56:1, 2.73:1, 3.07:1, 3.08:1, 3.42:1, 3.73:1

Title: Re: Rear diff compatibility
Post by: Blazin on May 16, 2011, 11:14:39 pm

You can swap the 10 bolt backing plates onto the 12 bolt and keep the correct brakes for your year truck.