850 HP,shifting at 6,800 rpm,400 trans- manual shift, adjustable tourque convertor,28" tall tire, car w/me in it - 3725# and I would like to clear the traps at 6,800 rpm - 1/4 mile. I have 342's now, with a spool. The car does not 60" well, nor does it pull thru the traps hard, it struggles near the end with some 13% torque convertor slippage..I am thinking the problem is related to the engine power/ shift point vs the rear end gear ratio. What recommendations are available here? Thanks Larry