[Dwight]

The 500 and 600 will meet your tq needs. Your tires are the weak link in a lite Cobra.

The 500 has a 3.27 1st gear and the 600 has your choice of 3.27 or 2.87 1st gear.
You need to consider your rear end ratio and tire size.

The 3.27 was to low for my 25 inch tires. First gear was use-less.

I chose the 600 with the 2.87 1st gear.


You have a choice of .64 or .82 5th gear in the 600.

Calculate you highway cruise speed to help you chose the correct trannie or do like I did and buy & test till you find the correct one.

Side note; Lainhart has a 3550 that spend eight year on the track with a 427 s.o. in front of it. We don't know the mileage but the front end and motor were worn out!
Motor rebuild by KC to a 617 hp 487 c.i. moster. Same 3550. Oh yea 12" wide rims and tires on the back.
Great trannie.

Dwight