First off I want to say sorry for starting one of these threads again, but this one is a little different.

I am more concerned about a street car than I am about a 1/4 car. If anything I would build more of an 1/8 car since thats all we have here in my area.

I've had 4.10s in a M6 LT1 car about 3 years ago, and I remember really liking them, but now I am trying to peice together a 9inch for my LS1 and I am really stuck on which one to get.

How much harder would the car accelerate with 4.30s vs 4.10s. Would you notice a huge difference on the street? I'm not too concerned with the friendlyness of it because 6speeds are forgiving. I seem to end up in a lot of interstate races that go to about 120 or so. Being able to rocket up there a little quicker would be nice and I just wonder if 4.30s would do the job better than 4.10s... or would it kill me because of all the shifting?

 

430 gears will roll in the eighth mile,i loved 430s in my m6,u need a good tire on the skreet.

 

i bet they do spin like hell.

 

So would the 4.30s be way nastier than 4.10s on the street or not worth the trouble?

 

Id stay 4.10's, i would only do 4.30's I didnt plan on making a ton of power or spraying the ***** off of it.

The reason why 4.30's are really good is the tall 1st gear and it really helps the launch. I spin around 2k @ 70 mph and I dont like spinning anymore, gas milage for me is a consideration.

In the long run if I decided to up to the trans to a M12 GTO unit, that would in essence do the same thing.

 

I am going from 3.90's I have now in my 10 bolt to 4.30's in my new 9" I should be getting on my doorstep in the next few days. Can't wait to feel the difference.

 

Keep me updated! Good points Blackscreamin

 

i love my 4.30's!! The car wants to get away from me with the shitty tires i have on now though

 

i love my 4:30's. they pull like a bitch..

 

Sweet! See its this kind of testimony makes me want to take the plunge. So... this might seem like a retarted question, but what kind of interstate mileage are you getting? As of right now I can get 30MPG on the interstate with my 3.42's and hotcam. You can be vague, like less than 20, or 25, or whatever. As long as it still gets around 23 or so I think I would love it.

My M6 LT1 car with CSR electric waterpump, BBK shorties, pullies, and 4.10s got 30mpg on the interstate.

 

I have run 4.56's with a 6 speed and the gas mileage
decrease isn't dramatic. Going from a 3.42 to a 4.30 I would guess you'd be around 23 mpg.

At 65 mph you'll be about 300-400 rpm higher at the same speed going 3.42 to 4.30.

This is a 26" tire in 4th gear with 4.10 gear

5600 106
5700 108
5800 109
5900 111
6000 113
6100 115
6200 117


This is a 26" tire in 4th gear with a 4.30 gear.

5600 101
5700 103
5800 104
5900 106
6000 108
6100 110
6200 112

 

Between the 2 there won't be a huge difference, in gas mileage or in acceleration. I have had 3.90's & 4.30's, if N/A I would have no problem running 4.30's again. I believe you will be happy with either, especially when going for 3.42's.

 

Iam actually curious as to what to get too. I have a decent shot of juice so should I stick with the 4.10s or go 4.30s. The car has M/T radials on it 275/50/15

 

4:30's here also, love them

 

4:30s here and it is violent on the launch.