What gear for my 307 Cutlass

Poke · 03-10-2010, 07:30 PM

I will be running a 307 olds motor with a 4500 stall and a 28" tire was just curious what you guys would recommend for gears???? Probably be some where around 3400lbs

Robert Swartz · 03-10-2010, 08:01 PM

Quote:

Originally Posted by Poke

I will be running a 307 olds motor with a 4500 stall and a 28" tire was just curious what you guys would recommend for gears???? Probably be some where around 3400lbs

First we need to establish a couple things.

Are you going to drive this car on the street?

Is it strictly a race car?

If you plan to drive it, you don't want a killer gear. If I had a similar car to this and planned to strictly drag race it. If it's pretty much a stock engine, you have a healthy converter and a small rear tire. A stock engine is going to peak out at about 55-5600 rpm. For a 1/4, I wouldn't run anything steeper than a 4.30. If it's an 1/8 car, you can go much steeper, you could easily run a 4.88-5.13, you'll still max your rpm out by the end of the run.

Just my.02

Poke · 03-10-2010, 08:56 PM

Yes the car also is going to be street driven,i was thinking of 4.30's to 4.56's it is a .60 over 307,big valved 5a heads,9.5.1 compression,and a semi dweller cam.

greg fulk · 03-11-2010, 02:09 AM

4.56 is all ya need.... but will suck on the street!

Marvin Robinson · 03-13-2010, 01:55 AM

If you're going to drive it on the street at all, do yourself a favor and run a 4speed OD trans, (200R4's work great), and you can run a 4:10 or 4:30 gear and still live with it on the street. It will even work well with a 3.73 if the street is more than the track use.

03-10-2010, 07:30 PM	#1
Poke Junior Member Join Date: Feb 2010 Posts: 6 Likes: 0 Liked 0 Times in 0 Posts	What gear for my 307 Cutlass I will be running a 307 olds motor with a 4500 stall and a 28" tire was just curious what you guys would recommend for gears???? Probably be some where around 3400lbs

03-10-2010, 08:56 PM	#3
Poke Junior Member Join Date: Feb 2010 Posts: 6 Likes: 0 Liked 0 Times in 0 Posts	Re: What gear for my 307 Cutlass Yes the car also is going to be street driven,i was thinking of 4.30's to 4.56's it is a .60 over 307,big valved 5a heads,9.5.1 compression,and a semi dweller cam.

03-11-2010, 02:09 AM	#4
greg fulk VIP Member Join Date: Jan 2003 Location: jackson Posts: 1,165 Likes: 0 Liked 5 Times in 3 Posts	Re: What gear for my 307 Cutlass 4.56 is all ya need.... but will suck on the street! __________________ Greg Fulk 308 308X P/SA "ALL AMERICAN"

03-13-2010, 01:55 AM	#5
Marvin Robinson Member Join Date: Jun 2005 Location: Gary, IN Posts: 139 Likes: 0 Liked 0 Times in 0 Posts	Re: What gear for my 307 Cutlass If you're going to drive it on the street at all, do yourself a favor and run a 4speed OD trans, (200R4's work great), and you can run a 4:10 or 4:30 gear and still live with it on the street. It will even work well with a 3.73 if the street is more than the track use. __________________ Marvin Robinson 3188 STK/SS