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BurnoutNova · 12-20-2009, 06:13 PM

I belive the shift pattern will also identify which you have. My 67 had the SM420 and reverse was to the left and down. My 69 K20 and 68 K10 were to the right and down. I was also told that '67 is the only year they used SM420's in out trucks.

12-20-2009, 06:13 PM	#6
BurnoutNova Registered User Join Date: Mar 2004 Location: CA Posts: 2,057	Re: 68 GMC 4x4 chassis being built to be a 70 4x4! I belive the shift pattern will also identify which you have. My 67 had the SM420 and reverse was to the left and down. My 69 K20 and 68 K10 were to the right and down. I was also told that '67 is the only year they used SM420's in out trucks.