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VegasBruce · 08-06-2011, 09:45 PM

Just measure them. It should be 1 1/4 on your 78. However in the last 30+ years they could be different. The C15 is just GMC's designation for a half ton. I guess they wanted to sound beefier than a C10.

08-06-2011, 09:45 PM	#8
VegasBruce Registered User Join Date: Apr 2011 Location: Just outside Sin City Posts: 239	Re: 3/5 Drop kits Just measure them. It should be 1 1/4 on your 78. However in the last 30+ years they could be different. The C15 is just GMC's designation for a half ton. I guess they wanted to sound beefier than a C10. __________________ Bruce 73 Stepside, 74 Blazer, 75 1 Ton, 66 Barracuda and a 05 Electraglide DD http://i56.photobucket.com/albums/g1...Rusti192-1.jpg