so after countless repairs , money and hours I finally got the truck running decent and driving smoothly and not even a week goes by and I start experiencing TQ shutter or what I believe to be TQ shutter starting around 45 mph . with 215k on the truck and tight resources I'm stuck in this position where I don't know what to do -20qt fluid exchange replace filters and hope for the best or replace TQ and have to do the fluid either way . also I see oil around where the main rear seal would leak but could be coming from valve cover on drivers side . I have to clean it up the best I can and try to pin that down but did notice my output shaft seal is leaking as well but when I was about to attempt to remove the drive shaft to replace the seal I couldn't get the bolts to break free by hand . even my large impact wouldn't budge them . normally wouldn't hesitate to attempt but every bolt under the hood that ive put a wrench on has snapped clean and I'm just spent mentally with this truck . I can't afford to made the wrong choice with this repair since its my only vehicle so any input from the community would be greatly appreciated ! I'm located near middletown NY if anyones close by and can assist as well . I just moved to the area and the only shop ive dealt with couldn't even handle a simple alignment job without issue so I'm pretty much on my own here .

 

O/D engages around 45mph or so, does it not? On my full size trucks, what I thought was TC stutter/shudder, was actually an engine misfire.... Those get amplified in O/D, with TCC locked.