The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

kcjones · 11-10-2008, 06:05 PM

My 67 C20 currently has an Eaton HO52 with 4.11. I run 3100 or so RPM on a 30" tire at 65.

If you're running higher than ~3000 RPM at 65 with normal size tires (between 27-30"), you've got gears lower [numerically higher] than 3.73.

11-10-2008, 06:05 PM	#5
kcjones I wish I was a cowboy Join Date: Apr 2008 Location: Rohnert Park, CA Posts: 409	Re: 12 bolt gear ratio My 67 C20 currently has an Eaton HO52 with 4.11. I run 3100 or so RPM on a 30" tire at 65. If you're running higher than ~3000 RPM at 65 with normal size tires (between 27-30"), you've got gears lower [numerically higher] than 3.73. __________________ -Kris Met list: Cyclone,Wilson,TranzAm,extd56,hotrodhomi,mnky30,Rokcrln,Brad,JerryJones(well, his truck anyway).