Gears will make a difference but not in the throttle lag department. You will need a tune for this. If you get gears I wouldn't recommend going over 3.55's and yes stock auto gear is 3.15.
2012 5.0 Brembo, AED Performance Tune, Lethal Off-Road X, GT500 AB, 3.73, Airaid cai, GT500 SW :yelpleased:
2014 CX-5 Touring
Gone but not forgotten:
2011 Mustang GT|GT500 AB |FRPP Tune|6A
2010 Rav4 V6 | 07 Mazdaspeed3| 04 SRT4| 99 GSXR 750
2012 Camaro SS L99 Gone and forgotten