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**Richard** · 10-03-2021, 07:03 PM

An easy tell for an 11.5 is that the pinion will have a damper on it. Looks like a harmonic balancer. I know the 11.5 came in 2500HD's I have seen. My swap rear end is from one. I would wager an 11.5.

10-03-2021, 07:03 PM	#3
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,698	Re: 2004 GMC 3500 rear end size question An easy tell for an 11.5 is that the pinion will have a damper on it. Looks like a harmonic balancer. I know the 11.5 came in 2500HD's I have seen. My swap rear end is from one. I would wager an 11.5. __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 Last edited by Richard; 10-03-2021 at 07:11 PM.