I'm very curious in this also as I run 4.11 gear and would like to drop to 3.90 gear to lower the rpm through the traps. I run a 29" tire and I would like to go back to the 28" tire. Dropping down tire size and gear would probably net same results? Thoughts
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 3:90 gear. 28" slick.
Best so far 9.95@135 mph. 1.39 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exhaust
950 Quickfuel.
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