Thor Forums

[Chance]

Starting with 2016 Ford model-year chassis, the new 6R140 6-speed transmission will have a much smaller jump in gear ratios between 6th and 5th than the present 5R110 5-speed between 5th and 4th.

Assuming same final ratio, when a downshift is required at cruising speeds the engine will no longer jump as high in RPMs. Gear ratio jump is presently around 41% and with new 6R140 it will be around 28%. That should address both the high RPM concerns as well as the associated noise.

Occasionally (rarely I expect), the smaller jump in gearing may require an additional downshift to 4th where the previous 5R110 would not need to go from 4th to 3rd gear. On those few cases noise and RPMs could be higher. But that should be very rare. In general more gear choices should allow better control of RPMs and hence excessive noise.