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*Peanutbutter* · 03-24-2013, 10:45 PM

does anyone really know the difference between the 550,630 and the 660, my 630 had the 471 with 5 and 2 and was a factory air brake tractor.

03-24-2013, 10:45 PM	#212
Peanutbutter Account Suspended Join Date: Feb 2013 Location: Mesa, Colorado Posts: 450	Re: GM Semis does anyone really know the difference between the 550,630 and the 660, my 630 had the 471 with 5 and 2 and was a factory air brake tractor.