Z51 final drive ratios

[alfie43]

Does the Z51 package come with a different rear end ratio than non Z51 cars?

If so, does anyone know what those ratios are for both stick and auto transmissions.

Alfie (Mariano)

[purpleRac3r]

Try this link:

http://media.gm.com/content/media/us...2014.tab1.html

Scroll down a bit and there is a chart showing all the transmission and differential ratios. The Z51 manual does have closer ratios than non-Z51, but the diff is the same for both. The automatic apparently has the same ratios, Z51 or not, and different from either manual version.

[alfie43]

Originally Posted by purpleRac3r

Try this link:

http://media.gm.com/content/media/us...2014.tab1.html

Scroll down a bit and there is a chart showing all the transmission and differential ratios. The Z51 manual does have closer ratios than non-Z51, but the diff is the same for both. The automatic apparently has the same ratios, Z51 or not, and different from either manual version.

Thanks...exactly what I was looking for. According to those specs, it looks like there are 2 different ratios for the auto trans; base model and Z51.

Manual trans: 3.42
Manual trans w/Z51: 3.42

Auto trans: 2.56
Auto trans w/51: 2.73

[purpleRac3r]

Yes, that's what I understand too. I imagine they did that so the Z51 auto is a little quicker than the non-Z51, since the transmission ratios aren't changing (like the manuals do). Gonna be a fantastic ride either way!