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LT1 (6.2L V8) Powertrain and Drivetrain Discussions Topics related to the LT1 engine.

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Old 06-25-2013, 09:37 PM   #1
alfie43

 
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Z51 final drive ratios

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)
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Old 06-26-2013, 08:08 AM   #2
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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.
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Old 06-26-2013, 09:26 AM   #3
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Quote:
Originally Posted by purpleRac3r View Post
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
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Old 06-26-2013, 10:02 AM   #4
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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!
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