Can anyone tell me what the most effective mods are that can be done to the rear diff/axle to get the best 1/4 mile times?
I have a 330 bhp sapphire, it does a 13.6 1/4mile @ 109 mph. I feel it could do better if I could launch it cleanly.

 

contact gearboxman. his company cts does fluid changes for the std viscous coupling to give different lock up characteristics, or alternative diff types.

 

get a diff out of a 1.6 gl that will get u up there quicker a couple of times