im new to this ok here goes i have a 1972 monte carlo with 350sb/turbo 350 trans stock rear end . I wanted to know what would be the best gearing cause my launch sucks but it pulls after second gets in. I was thinking a 3.73 rear end but idk so if i cant get some advice it would be very appreciated.

 

What do you want to do with it?

 

Well race on weekends but you know sometime cruising i guess but you know a little import pulls up i wanna be able to launch on em cause it takes till 2nd gets in to start pulling anf
my trans is automatic

 

To "launch" better, you need to increase your gear ratio.
What do you have in it now ?
Remember, the more turns to the Driveshaft, is going to knock you top end down. Why do you think that 3.73 is the right gear ?

 

I'd go with a 4:11

 

Idk what gearing i have now. My friend says that 3.73 is good

 

Rear wheel drive GM transmission gear ratios Here is a site that can help assist you on your gear ratios for your gear ratio these are the stock versions. I have known people to run them up to 4.10 gear ratio and who put in a 350 turbo with performance rebuild kit and a shift kit. In my opinion most I have known have gone to 3.73 or go down to a 3.42 or 3.23 gears ratio though. It is just what you plan to use it for and how much fun you plan to have with it. If it's a race car I say have fun if you know your stuff and can maintain it well.

 

You may have 3.73 in it now. But until you're sure, it's really hard to give any recommendation. Are you going to do anything to get your RPM's up ?

 

Good Golf think that pretty much said it all.

 

Figure the ratio is take the ring to pinon add them up, and divde them into each other.