I have an 88 sentra that i race in scca itc. Car is doing well except that the gearing is extremely wide and i drop allot of rpm when shifting from 3rd to 4th etc. any alternate trans available with closer ratios or can i purchase different gear sets thru the aftermarket etc?...Any help is appreciated...Thanx...Dennis....also, any perfromance pistons available for this 1.6 efi......need .040 over with some increased compression.....