68 GMC rearend - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pointbreak · 10-07-2014, 11:03 AM

OK, I'm sure this has been covered in here somewhere but I'm gonna throw this out there anyways.
I have a 68 GMC c10. With a 307 that's been rebuilt, and the granny 4 SPD. I'm not sure about the gear ratio all I know is that when I'm going 65 mph its a little loud. If I push it to 75 the world is ending!
It is the camper special with coil springs and posi track rear end. Does anyone wanna hazard a guess at the rear end. The 307 is also original. Its my daily driver so I would like to make it more highway friendly. I'm at work in camp for a few weeks now. So I'll pull the cover when I get home. Anyone have any suggestions as to what ratio I should have.

10-07-2014, 11:03 AM	#1
pointbreak Registered User Join Date: Jun 2014 Location: Van island BC Posts: 41	68 GMC rearend OK, I'm sure this has been covered in here somewhere but I'm gonna throw this out there anyways. I have a 68 GMC c10. With a 307 that's been rebuilt, and the granny 4 SPD. I'm not sure about the gear ratio all I know is that when I'm going 65 mph its a little loud. If I push it to 75 the world is ending! It is the camper special with coil springs and posi track rear end. Does anyone wanna hazard a guess at the rear end. The 307 is also original. Its my daily driver so I would like to make it more highway friendly. I'm at work in camp for a few weeks now. So I'll pull the cover when I get home. Anyone have any suggestions as to what ratio I should have.

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