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1969 GMC · 12-07-2003, 06:38 AM

fyi, your rear axle (ho 72) has a drop out centersection like a Ford 9 inch rear axle, so it is easier to change gears. if you have a dually then you most likely have 5.14 gears. The highest gears you can get are aftermarket 3.90s, but rumor has it that they are no longer made. You can find 4.11 and 4.56 commonly in our trucks. Hope this helps.

12-07-2003, 06:38 AM	#2
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	fyi, your rear axle (ho 72) has a drop out centersection like a Ford 9 inch rear axle, so it is easier to change gears. if you have a dually then you most likely have 5.14 gears. The highest gears you can get are aftermarket 3.90s, but rumor has it that they are no longer made. You can find 4.11 and 4.56 commonly in our trucks. Hope this helps. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650