I am further along on the drivetrain upgrades, and am excited by the prospect of adding even more durability and reliability to my favorite member of the fleet.
Here is step one: Axles
3.90:1 Axle gearing from
Great Basin Rovers, which will be installed into a fresh set of third members, new bearing, seals, HD axle shafts, etc. along with front and rear ARB air locking differentials (RD128). The ARBs will be connected to the air valves with HD stainless lines.
If I intended to keep the V8, a 4.1:1 (or the new 4.14:1) ratio would have been ideal, but with the plans to install a 300TDI, the 3.90:1 is the best choice. Highway speeds will be limited to around 65 mph with the ability for some passing, but I am perfectly content with that in this truck. Overall performance should be excellent on the trail and when fully loaded.
Step two: Brakes
I am still investigating here, but the brakes need to be serviced in the rear and upgraded in the front. Most likely the front will be upgraded to DBA rotors and stock pads. The vented rotors will aid with reduced fade, etc. I may upgrade the rear rotors as well. The Expedition Exchange brake lines are of interest as well for their increased length and better brake feel.
I will also be disabling the ABS system and the dash light. The Disco I ABS system is actually a hazard from my experience.