Originally Posted by Dan_the_C5_Man
Interesting thread - pretty obvious why we (NA LS7 cars) got hosed on the top 2 cogs - GM knew what they SHOULD have been, but couldn't pull it off in the name of keeping our gas guzzler tax at bay - they didn't have this issue with the ZR-1, as they knew that goose was already cooked.
Sounds like the hot set up is Z 1-4 and ZR-1 5-6.
Depends on what year(and option) ZR1 transmission you are talking about. The last couple of years of the ZR1 it ZR1 had the same 5th & 6th gear ratio's as the Z06(unless you had the PDE option).
I wish my Z06 had the .81 5th and .67 6th gear, but my highway mileage would suffer in 6th gear, but I would have much better acceleration in 5th gear(160+ MPH) and still be able to hit 200 MPH at 7,000 RPM in 5th gear.
But, I do drive many more miles cruising at 70-80 MPH on the highway than I do driving 160 plus MPH in 5th gear.
If a 3.90 rear gear were available to fit the Z06 differential, I would rather have the 2013 ZR1(non PDE) gear ratios in all 6 gears.
Z06 1st through 4th with the early year ZR1(and PDE option) 5th and 6th gears with the stock 3.42 rear gear.
2.66 X 3.42 = 9.1
1.78 X 3.42 = 6.09
1.30 X 3.42 = 4.45
1.00 X 3.42 = 3.42
.81 X 3.42 = 2.77
.67 X 3.42 = 2.29
With the late ZR1 transmission with a 3.90 rear gear.
2.29 X 3.90 = 8.58
1.61 X 3.90 = 6.28
1.21 X 3.90 = 4.72
1.00 X 3.90 = 3.90
.74 X 3.90 = 2.89
.50 X 3.90 = 1.95
Even through I would have less gearing in 1st, I should have less spinning, giving me better aceleration.
Better acceleration in 2nd gear.
Better acceleration in 3rd gear.
Much better acceleration in 4th gear.
Better acceleration in 5th gear, but would hit the limiter at 192 MPH.