My LT1's got a .560/.569 cam and a 3200 stall, but off the line it takes a while to get moving. Once it hits 4000rpm all the horsepower picks it up quick. It has 700r4 and a 3.23. Are 3.42 or 3.73 gears what I need? But I dont want to be at more than 2500rpm@70mph, since this is my daily driver. Its around 2200rpm@70mph right now.

 

I think 3.73's are a good choice. 3.73's will run about 2500 rpm at 70.

 

So are 3.23's too small with a 3200-6500 powerband? Are the 3.73's gonna make a more noticeable difference over 3.42's? Cuz I have an extra set of 3.42's

 

There is about a .1 difference in the 1/4 between 3.42's and 3.73's from what I have seen, but since you already have an extra set of 3.42's I would put those in and see how you like them. You can always step up to 3.73's later.

 

I wouldn't think you'd see a worthwhile gain going from a 3.23 to only a 3.42, but hey, if you've got 'em, might be worth a shot?

Since you've already done an aggressive cam and a stall converter, fuel mileage can't be your main concern, so I'd say go with 3.73's at least. I've run both 3.73's and now 4.10's in my car (A4) and haven't noticed a huge mileage difference, even compared to the factory 2.73's. Yes, there IS a difference, but really not that much between the 3.73/4.10.

 

I agree with a 3200 stall, you'll want 3.73's that's what i have and love it.....just need to get the E.T. Streets now