I have uploaded a very nice compilation of data and calculations concerning transaxle gear ratios to my website. Please see:
Transaxle gear ratios
In this I have included my transaxle, yours and a bunch of well known high performance autos. I have been looking at the cars in the upper section which had high torque v-8's, etc. I have highlighted those in yellow and green. It would appear that my ratio for first gear (8.31) is about the same as a Viper, and the S7. A little shorter then the McLaren F1, but a little taller then the SVT Cobra, and Z06. We will see as the GT40 is a much lighter car then any of the other cars, and has (in my case) has lots of torque.