I just picked up a solid used World Class (WC) T5 transmission for $375.00 with low miles and ready for use. While this transmission does not have the tallest 5th gear possible it is still a good improvement over the Spit/GT6 .797 overdrive gear ratio and final gear ratio of 3.27 X .797 =
2.60. The rpm will be low but being that the car will be so light and aerodynamic I think the little engine will still do just fine even without the boost from the hybrid drive.
Here are the gear ratios for the 1352-260:
1. 3.35
2. 1.99
3. 1.33
4. 1.00
5. 0.68
FD = 3.27
FG = 2.22
Here is a good link that talks about the T5 transmission and offers gear ratio charts =
TREMEC T5 Transmission -Modern Driveline
The advantages of the T5:
#1. Abundant they are all over the place
#2. Inexpensive
#3. Strong
#4. Lots of Gear ratios
#5. Easy to customize
#6. Light weight only 75lbs
#7. Compact
#8. Easy to get parts
#9. Tons of shifter position options
These transmissions were in a lot of vehicles from cars to light trucks. Stock power is in the 175 to 230 lbs-ft range. all the way up to 400+ in racing built units. So for a small eco car the stock power of these transmissions are more than adequate. Even after adding a small hybrid drive to the mix. You also have a wide selection of gears to experiment with which is great considering there are not a lot of options for Spit/GT6 rear end gearing.
GH
