Hey all!

Just got back from the track, and my car sucks a$$, as I would have expected. The mods listed below are mostly sitting in a box, waiting for install. I'm still waiting for the headers to show up, and the now back-ordered throttle body. Anyways, it was the first not-rained out race day, and I ran the car, basically stock. Best was a 16.09 @ 85.3 mph. Slow enough to time the run with a sun dial!

Enough ripping on my own car, after all, its basically stock.

Now its time for the question:

With the mods listed below, along with a shiftkit and a 2500 stall converter, what would be a good gear ratio? Now, a little more info: This IS my daily driver, so I don't want to go to extreme with gears. My buddy has 3.73's in his '86 with a T-5, and thats good, but what about with my AOD? He thought it would still be okay with 4.10 gears, but I want to make sure.

What rpm's would I run at at 55 or 60 mph with 4.10's? 3.73's?

THANKS!

 

honestly, with that trans i would go with 3.73

foxes have a nack for runin outa gear with higher ratios



but its up to ya, and maybe sum1 with a fox could chim in and correct/agree with me

 

what gear does it have now?

 

Probly a 2.73

 

Right you are, sprostang! The 2.73's are nice for gas milage, but dont give me anything for power. Any ideas on using 3.73's compared to 4.10's?

Thanks!

 

http://www.allfordmustangs.com//Detailed/641.shtml trap speed
and
http://www.allfordmustangs.com//Detailed/608.shtml rpm by mph

 

Hey thanks for those klapdout! By what those calculators show, if I ran 4.10's I would put myself at 5200 rpms @ 92 mph in 3rd gear. Now, if I remember right, AOD's won't shift to overdrive at full thottle? I know I'll be doing over 100 mph in the 1/4 after I get done with some mods, so I guess I should go with 3.73's?

 

4.10's for an auto. Don't be scurred.