I think the Lincoln Mark LT has the 4V 5.4L, not the 3V like F-150s use. Slightly different animal on the valve train.
It's a 3V in this model year. Couldn't tell ya what they did in other years of this thing, but 2008 was the last year of Lincoln badging and the LT.
Agreed that I think it's your timing chain and cam phasers. A colleague just had this done on his 2008 Ford Expedition XL.
I think the sound certainly sounds like that, but I cant jive that with it following engine RPM after a brief throttle tap in gear, and slowing like it's winding down and then "click" and stopping, and only in gear.
Other stuff folks have seen on these, crap rattling in the cats, or heat shields falling down and sitting on things, etc... loose stuff...
But... the consistency of how locked it is to engine RPM and that sudden click and stop as the engine falls back to idle, really says "torque converter" to me. It's the only thing spinning at engine RPM that would also stop at idle.
Which sucks. But at least it isn't the transmission.
If I find out it's just a damned fan clutch I'm going to be relieved and annoyed. LOL. But it doesn't seem to be that far forward.
Any thoughts on how this could be the timing chain and cam phasers while still doing that "click and stop" thing as the RPM falls back to idle, lemme know. ??
I think we've decided that we shouldn't drive it anymore, until it heads to a shop, and I think without a lift, I'm not up for dropping a trans or a torque converter out. Nor do I have a really safe way to operate it in gear while using a stethoscope (or wooden dowel rod) to find the exact source of the noise.
So... I'll make some calls tomorrow to a couple of shops I have good references on. We really needed to find a shop we trust out here in the boonies anyway (I do most of the maintenance on the vehicles but some stuff I just don't want to do) and our last good shop that isn't our Dodge diesel specialty shop that we liked to use, closed up... knew the owner forever, but he finally decided to retire... and it was clear back into and across the whole city from here anyway.
So we're in mechanic hunting mode. Preferably out here closer to the prairie home.
I hate to say it, but this is why I swore off Fords in my youth. If the torque converter is bad at 150,000 that's incredibly annoying. I know the truck hasn't ever towed anything. Ever. Not even before we owned it. This drivetrain has led a wholly stress free life.
Unlike the Yukon, which has towed all sorts of stuff and things it probably shouldn't have towed. Or we're right at its towing capability and in rolling hills doing a LOT of shifting with heavy loads.
I can forgive the Yukon transmission for slipping a little. This truck? Not so much.
Probably won't be able to get it anywhere until Friday. Then a holiday weekend. So probably won't know until after the holiday.
Karen says she's cool putting around in "Box of Dirt" the 2000 Subaru Outback for now, but I have been told that there will be a serious cleaning done to the old beast this weekend or else. Haha.
The big dog doesn't like the Subaru much but he'll survive. I'll cart him around in the Yukon as much as possible. He's a little cramped in the Subaru with his head able to touch the ceiling if he tries.
