Those 5.29’s might be the ticket, but it is a lot of work to find out. I actually have either a front or rear 5.29 gear set sitting in the shop, I can’t remember for sure. I ordered a full set and one arrived damaged so I returned it and never reordered. I think my biggest complaint is the transmission is constantly shifting at the slightest variation in road grade. Trying to use cruise control is super aggravating as it will drop to a real low gear on hills and run the rpms super high when it’s not even necessary. That and the sway when a semi truck is passing me (improved from what it was). 7.5 mpg @ 65mph is brutal too, but probably won’t get much better if I stick with gas. A Ram 2500 with the 8-speed sounds nice, but most of trucks I am finding in my budget have the 6-speed.