The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - How to tell a c-20 from a c-30

magnethead · 10-05-2006, 10:44 PM

I was about to say, check to see if it's a corp 14 bolt or Dana 70. Haven't heard of P-20. I'll also bet cab change.

look on the axle tubes- if you see little slag chunks on the tube in a location other than where the springs are mounted (+- about 4"), i bet the axle has been swapped too- the 3/4 and 1 ton frames are i believe 8 (confirm?) inches narrower to accomodate the extra tires with minimal flaring.

10-05-2006, 10:44 PM	#6
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	Re: How to tell a c-20 from a c-30 I was about to say, check to see if it's a corp 14 bolt or Dana 70. Haven't heard of P-20. I'll also bet cab change. look on the axle tubes- if you see little slag chunks on the tube in a location other than where the springs are mounted (+- about 4"), i bet the axle has been swapped too- the 3/4 and 1 ton frames are i believe 8 (confirm?) inches narrower to accomodate the extra tires with minimal flaring. Last edited by magnethead; 10-05-2006 at 10:46 PM.