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What rearend do I have?

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Old Jan 5, 2007 | 01:02 AM
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From: Afghanland
Default What rearend do I have?
Hey guys, I've gotta '00 Silverado ECSB 5.3L Z71... I'm looking to buy a diff. for it, but I don't have a clue on what rearend I have. This is my first Chevy I'm sure I'll be asking lots of questions..
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Old Jan 5, 2007 | 01:47 AM
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10 bolt 8.5 30splines
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Old Jan 5, 2007 | 02:53 AM
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From: Afghanland
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Originally Posted by dc96819
10 bolt 8.5 30splines
Thanks, how do I find out what ratio it is stock?
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Old Jan 5, 2007 | 08:03 AM
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FryZ71
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Look in the glovebox at the RPO codes...GU6 is 3.42, GT4 is 3.73, and GT5 is 4.10. Your truck will be one of those 3, most likely 3.73s.
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Old Jan 5, 2007 | 09:56 PM
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Originally Posted by dc96819
10 bolt 8.5 30splines

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Old Jan 5, 2007 | 10:05 PM
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If you go to buy a new differential be sure you specify the year model. 99+ have a different carrier brg. They are often refered to as an 8.6 instead of 8.5 for this reason.
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