So im switching from my six speed which i've had forever to a th400.

Never had anything but my six speed, and never had a 3 speed in my life.

The car is in six. LSX 454 with a 300 shot. I'm expecting to be somewhere in the high 140 to 150ish trap i'd assume and I dont wanna run out of gear.

I know the 4.11s in the 12 bolt right now wont do...

is there some kind of calculator, or does someone know the gear to mph ratio? Planning on either a 26 or 28" tire and I'll be reving to 7400rpm.

any help, or a point in the right direction would help! thanks!

 

3.70 gears with a 28" tall tire should be just right for you. Bob

 

Think I can make mid-low 130s on motor with 4.11s?

 

If that engine is put together with all the right parts, it should. Bob

 

I ment without running out of gear

If its capable of 130 on motor, will a th400 with 4.11s make it across the line before I hit 7400 rpm on a 26" or 28" tire? :-D

there's gotta be some kind of standard.. do people just guess and check or what?? fbody.org is no help anymore

 

Man it will be close... i have 4.10, 28's, an d th-400 at 6900 i was top out at 126 and i ran a lil out of gear shortly after the 1/8 on spray... so i am going to a 3.73 i believe just my .02cents