I picked up this 2012 Yukon XL Denali last year and it currently has 104K miles, very well cared for. I'm only putting 10K miles per year max, minimal towing, and would like to do what I can to keep the trans healthy.
I've read up on the line pressure thread stating raising via HPT might not do much to a stock unit. I do understand the factory slipping/lockup programming in the lower gears so it seems the consensus is to either remove the slip, or remove lockup in the lower gears is the easiest?
Another option is to remove the trans and replace the converter early, would be a pita since mine is AWD.
I love this vehicle despite the fuel prices, plan on keeping it for a while. How detrimental is the MPG hit with removing lockup in the lower gears?
Would it be better to remove any slip in the lower gears as opposed to removing lockup? How jerky would it be if all slip is removed?
The engine definitely does fine lumbering along at 1000-1200 RPM at around a steady 40-45 MPH cruise, my concern is if the smoothness is coming from increased slip at those speeds, or does it make a difference.
All input appreciated.