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arussh · 02-09-2017, 03:22 PM

i installed 3.91 a few years back. Bought the GM kit and had dealer do install included transmission reprogramme. Nice performance difference on street not too big of a penality gas wise on highway. A good bang for the buck.

02-09-2017, 03:22 PM	#20
arussh Drives: 2011 2ss/rs, 1990 iroc-z Join Date: Jul 2011 Location: Ottawa Ontario Posts: 197	i installed 3.91 a few years back. Bought the GM kit and had dealer do install included transmission reprogramme. Nice performance difference on street not too big of a penality gas wise on highway. A good bang for the buck.