98ws6firebird

iTrader: (2)

I have 4:10 gears but changed my tire size from a stock 26'' to a 28'' tall. I know I changed my effective gear ratio but to about what 3.75 or closer to 3.90.

pancho toco loco

iTrader: (8)

http://www.f-body.org/gears/ That should help you. More like 3.80's

98ws6firebird

iTrader: (2)

Thanks...that gives me my mph at a given rpm but how can you calculate et's based on gear ratios. Which gear ratio gives you the fastest et?

pancho toco loco

iTrader: (8)

Well from what I have been told for all out drag times you want to cross the line right about where you car peaks on the HP curve. On my auto car w/ 26in tire and 4.10's out back i cross the line at around 5800. I've never dyno'd my car to know but being a stock long block it pulls to about 6k, Shifts are set at 5950 1-2 and 5850 2-3. Dont know if the helps but should give you and idea.