Does anyone out there in TDR land have an early first gen. auto with a Gear-Vendors. My father-in-law has an early 91 4x4 with the 727 auto. and is considering this to drop his highway cruising RPM. I agree that this will help with an empty truck. My concern is when pulling his 5er, how much torque convertor slip and heat will occur as the 727 does not have a lock-up torque? Is there any gain when trailering? Any ideas? Thanks, John.