I just bought my 1st super duty similar to yours mines manual sorry my typin might be off from iPad. Anyway I rebuilt mine from salvage this year , when I received it, 4x4 wasent in but it was saying 4x4 for 100 miles or so then went off. The truck seems slow still with slight hum F/r ( hit side) hub or 4x4. What's the easiest way for me too test or troubleshoot if that hit side hub not disingaging or something damaged. The F drive shaft not spinning in motion I can't tell if the hubs are.
Also what are my best bang for $ mods and parts I need.
Really slow rite now with trailer I don't like towing it's that slow. 175000m runs awesome no leaks
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