[p47dman]

In years past, to change gear ratio, all I had to do was 12 bolts and a ring and pinion gear. To change ratio on my 24 SS, what all is now needed? And will a tune in the BCM update all the parameters, ie, speedo?

[Joshinator99]

Originally Posted by p47dman

In years past, to change gear ratio, all I had to do was 12 bolts and a ring and pinion gear. To change ratio on my 24 SS, what all is now needed? And will a tune in the BCM update all the parameters, ie, speedo?

Yes you need to change the rear pumpkin entirely to change gears. Are you auto or stick? Believe 2.77 is rear gear on auto (deeper and more greats in the auto) and manuals get 3.73 rear gear. You’d have to tune the ECM/TCM to get speedo and shift points fixed.

[p47dman]

A 10 and 2.77 is correct. Yes she has very long legs

[Joshinator99]

Originally Posted by p47dman

A 10 and 2.77 is correct. Yes she has very long legs

Why do you want to change if I may ask? First gear is VERY steep, even with 2.77 gears. Once you’re in the power band you’ll stay there with the A10 (or A8 for that matter). I suppose if you’re staying NA only then there might be a tenth or two in the quarter by going 3.73 but not sure that juice is worth the squeeze.

[p47dman]

Just dreaming on what I may do after warranty is gone. it was so easy to do on my Chevelles, it was kind of fun playing with it.