I have a 99 LS1 with a Th400/3500 and 3.42's. My problom is that my car feels like it has no gear in it. I was wanting to know what gear i should put in it. (4.10's or 3.73's)

 

Hey bro, I have a '99 LS1 with a Turbo 400 w/3.42's also, only diff is I have a 4000 stall, and mine feels and runs great! Don't know why urs feels like it has no gear? Also, what first gear you got? I got the 2.75 first gear, might make a diff there, but the other two gears are the same, so I don't know

 

Go with a steeper gear. 4.10's should get you what your looking for.