The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Post pics. Lets see how many 60-66 4x4 are out there.

justcuz · 05-20-2010, 04:34 PM

^ Correct. I forgot that the 1/2 ton gear ratio changed in 1963 when they started installing 12 bolt rear axles. So if you had a corporate HO 33 with a dropout center section in the rear axle it was probably 3.90 and a 12 bolt would have been 3.73.

05-20-2010, 04:34 PM	#307
justcuz Registered User Join Date: May 2008 Location: Alta Loma, Ca. Posts: 930	Re: Post pics. Lets see how many 60-66 4x4 are out there. ^ Correct. I forgot that the 1/2 ton gear ratio changed in 1963 when they started installing 12 bolt rear axles. So if you had a corporate HO 33 with a dropout center section in the rear axle it was probably 3.90 and a 12 bolt would have been 3.73.