Question about 2000 GMC Jimmy

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The rear went out in my SUV and I need to know the gear ratio. I have another rear but need to know if it will work.

The rear went out in my 2000 GMC Jimmy. I need to know the gear ratio. I have a rear from a 2000 Chevy Blazer and I want to see if the parts are interchangeable. Thanks

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  • fallnights20 May 15, 2009

    Do you know by chance if the Blazer rear would work?

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Hold one wheel. mark the other wheel. Turn the unlocked wheel two complete revolutions. Count the number of turns the yoke make in two revolutions of the unlocked wheel. 3 1/2 turns= 3.42 3 3/4 turns 3.73 and so on

Posted on May 15, 2009

  • Clint Smock
    Clint Smock May 15, 2009

    Yes it will. But try to get the same ratio

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Want to change gears in rear end for posi traction in a 98 gmc25000 is this possible?


It is possible, you just have to know what gear ratio you have in your Sierra. I had issues with my son's rear differential and did the Salvage Yard and picked one up for $250.00 with less then 45,000 miles. Remember new cars end up at Salvage Yards also.

Here are the Pro code for the rear ends to your Sierra and you can match one up at a Salvage Yard.
GQ1 -- AXLE REAR, STD RATIO
GT4 -- AXLE REAR, 3.73 RATIO
GT5 -- AXLE REAR, 4.10 RATIO
GU4 -- AXLE REAR, 3.08 RATIO
GU5 -- AXLE REAR, 3.23 RATIO
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HC4 -- AXLE REAR, 4.56 RATIO

Open Your glove box and look inside it. Should be a list of codes on the bottom.
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Good luck and keep me posted and call around Salvage Yards, there prices will differ from one to the next salvage yard and don't ask them for a posi rear end. The cost will you more, just search all the SUV's and look at the pro codes in the glove box. Hunt, most awd system SUV will have the G80 rear end.

Good luck and keep me posted.

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