Z51 different tranny?
Thread Starter
Burning Brakes
Joined: May 2004
Posts: 996
Likes: 13
From: Dallas TX
Z51 different tranny?
The chevy site says the Z51 contains "special performance gear ratios in both automatic and manual versions". Does anyone have any info as to what the ratios are and what gas mileage and acceleration is like compared to base. I really want the F55 but I don't think I can get the more aggressive tranny with it 
Melting Slicks
Joined: Nov 2004
Posts: 2,285
Likes: 0
From: Denver PA
St. Jude Donor '07
MN6 trans w/Z51
STD / Z51
1st 2.66 / 2.97
2nd 1.78 / 2.07
3rd 1.30 / 1.43
4th 1.00 / 1.00
5th 0.74 / 0.71
6th 0.50 / 0.57
Reverse 2.90 / 3.28
STD / Z51
1st 2.66 / 2.97
2nd 1.78 / 2.07
3rd 1.30 / 1.43
4th 1.00 / 1.00
5th 0.74 / 0.71
6th 0.50 / 0.57
Reverse 2.90 / 3.28
Last edited by sscamaro; Mar 13, 2005 at 01:00 PM.
Le Mans Master
Joined: Nov 2004
Posts: 6,566
Likes: 2
From: Goleta CA
Cruise-In VIII Veteran
Originally Posted by BW1
Isn't the Z51 ratio change accomplished in the differential? I thought there was only one flavor of 4L65-E transmission for the C6. 
Nope. All manuals get the 3.15 rear, Z51 manual gets the tranny upgrage in addition. For autos, the tranny is the same with Z51 or without, but the diff gear is different (don't remember the auto ratios). The upgraded differential in the auto Z51 is also available without Z51 as the "performance axle ratio". I think it's only like $300 for that option.
Team Owner
Joined: Feb 2001
Posts: 27,254
Likes: 136
From: Short Hills, NJ
Originally Posted by mlongo99
Nope. All manuals get the 3.15 rear, Z51 manual gets the tranny upgrage in addition.
Originally Posted by mlongo99
For autos, the tranny is the same with Z51 or without, but the diff gear is different (don't remember the auto ratios). The upgraded differential in the auto Z51 is also available without Z51 as the "performance axle ratio". I think it's only like $300 for that option.
Drifting
Joined: May 2002
Posts: 1,530
Likes: 1
From: Houston TX
Mn6 Z51
Originally Posted by sscamaro
MN6 trans w/Z51
STD / Z51
1st 2.66 / 2.97
2nd 1.78 / 2.07
3rd 1.30 / 1.43
4th 1.00 / 1.00
5th 0.74 / 0.71
6th 0.50 / 0.57
Reverse 2.90 / 3.28
STD / Z51
1st 2.66 / 2.97
2nd 1.78 / 2.07
3rd 1.30 / 1.43
4th 1.00 / 1.00
5th 0.74 / 0.71
6th 0.50 / 0.57
Reverse 2.90 / 3.28
