[bhavyas]

What could be the reason for going with the taller gear ratios (less aggressive) as opposed to the shorter ones? The taller gear ratios are generally associated with better fuel economy.. but the SS manual just gets 1 better than last gen? So then was it used with the intention of reducing the weight of the transmission?

[toehead93]

Acceleration is greatest in first gear and drops off each gear. So extending the highest rate of acceleration to 54mph helps 0-60 times. If you shift earlier to second then that point until 54mph you are accelerating slower. It may be a disadvantage to have the extra shift at the track but this close ratio is better on the road course.

[oldman]

Originally Posted by toehead93

Acceleration is greatest in first gear and drops off each gear. So extending the highest rate of acceleration to 54mph helps 0-60 times. If you shift earlier to second then that point until 54mph you are accelerating slower. It may be a disadvantage to have the extra shift at the track but this close ratio is better on the road course.

we will agree the gear is best from a rolling street fight or the autoX, for a stop light challenge, it is an A8 or 4.10 coupled to a M6. I'm doing whatever I can to broaden the mid and upper range torque: CAT, MSD intake, Cat bypass (keep the factory try-y), tune. Later small cam and heads. I don't know if this 8.6" rear has the same gear setup as the 5th gen. In fact Richmond says only 2010 to 2014 for their 8.6" gear sets. Well take that back they are now saying all, I just checked their site.

http://www.richmondgear.com/pdf/Rich...n1.pdf#page=25

[oldman]

a torsen looks good, no clutch to wear:
http://www.justdifferentials.com/TOR...m8.6irs-32.htm
Auburn pro
http://www.justdifferentials.com/AG5.../ag5420138.htm
an Eaton based torsen
http://www.justdifferentials.com/TT9.../tt912a686.htm

Assuming if the center section takes the same gear it will take the same diff...