Thor Forums

[Chance]

Are these the Aisin gear ratios you are refering to?

It’s interesting that the test requires five launches in a row up a very steep 12% grade within 5 minutes, and then requires repeating the same test in “Reverse”. For this test it appears that having a very low reverse ratio would also be helpful, which is not always the case. The Ford 6R140 transmission in particular has much taller reverse gearing than 1st forward gearing.

Some of the lighter-duty 8- to 10-speed transmissions are using about 5:1 ratios for 1st and reverse. That should help with this part of the test. It will be very interesting to see if the new 8- and 10-speed heavier-duty transmissions to be introduced soon have much lower initial gearing like their lighter counterparts.