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Drivetrain - 2001 - 2010 Discuss front and rear axle, transfer case, brakes, etc. Transmission questions belong in the appropriate transmission forum below. First through fourth generation...

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Old 09-14-2017, 09:54 AM   #1 (permalink)
BigWhtTruck
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Rear Rotor Confusion

I notice there are 2 different rear rotors for my truck. There is a 330mm Diameter X 86.86mm OverallHeight Rotor; with 4.63in Center Hole and a 330.4mm Diameter X 90mmOverall Height Rotor; with 4.84in Center Hole. If the originals were on, obviously, I couldjust measure but since they arenít original, is there any way to tell whichones they should be?

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Old 09-14-2017, 10:03 AM   #2 (permalink)
corneredge
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I learned this the hard way on my 09 LMM. You need the larger inner diameter for the duramax rear axle. The smaller diameter is for gas 2500 trucks.

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Old 09-14-2017, 10:39 AM   #3 (permalink)
TheBac
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yep, you want the 4.84 rotor. The 4.63 were for the 9.5" rear axle.
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Old 09-14-2017, 08:16 PM   #4 (permalink)
G2GBY
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GM Part :15712803, ROTOR,REAR BRAKE(330.4MM IDX 90MM THICK)(91.35 MM THICK) Require Quantity:02 Package Quantity:1

Last edited by G2GBY; 09-14-2017 at 08:27 PM.
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