It's not to bad, just do one side at a time and don't rush. It sounds like you have the rest figured out, and I would replace the shackles and...
Your engine takes a CAT 1R-0716 oil filter.
Just install the clutch with the adjusting lock ring down onto the nice clean flywheel with a new pilot bearing in the flywheel.
Eaton Fuller does make a 2200 foot pound 18 speed transmission.
I would go with the glider kit with a cat hands down.
Replace for sure, the kits to rebuild are too expensive to be considered.
On an acert C15 the pre coolers can also leak sometimes and the engine will use coolant. Just remove the charge air pipe from the pre cooler and...
I wouldn't be afraid of a 6ts at all, epescially with a CAT warranty.
The last time I checked a set of injectors for an MXS ran about two grand.
6NZs use a 70 pin ecm that is different from the ones discussed here unfortunately.
The turbo was probably seized up right off the shelf. I've seen that several times with turbos for ISXs from the era that your truck is from.
It's on the bottom of the thermostat housing on the right side of the engine.