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95 S_Trucker · 10-04-2021, 11:01 AM

You have an 11.5". The only way it could be a 10.5 is if the truck was a SRW with a 6.0. But the 6.0 trucks had 4.10 ratio. So, since your truck has 3.73, we can tell you have an 8.1 or 6.6. So you have an 11.5".

10-04-2021, 11:01 AM	#4
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,178	Re: 2004 GMC 3500 rear end size question You have an 11.5". The only way it could be a 10.5 is if the truck was a SRW with a 6.0. But the 6.0 trucks had 4.10 ratio. So, since your truck has 3.73, we can tell you have an 8.1 or 6.6. So you have an 11.5".