I want a little more torque from takeoff and thought about swapping my 3.23 sure grip for a set of 3.55 sure grip gears. I have also thought about putting the lower gear set into my 904. Thinking I might do one or both. How much highway speed driving will I sacrifice if I do the 3.55? Will it really benefit me much? Is it worth the swap? I can get a complete unit for $600. I figure I can sell my 3.23 set to pretty much absorb most of the cost.

I also have access to a set of 3.91 gears buy figure those would kill me at cruising speed. I have a 73 challenger with moderately built 69 340 with Edelbrock heads, Voodoo cam, about 10:1 compression. I have 15 inch wheels if that helps.

I am pretty sure I am going to do the 904 gear swap. I have a spare transmission and will do the swap and rebuild myself. Anyone do it? Is it worth it? Gearset and rebuild kit will cost me about $275... Not too bad to me if it gives me some extra torque on takeoff.