Phoenix Friction has a dedicated section just for IHC/Navistar medium duty clutch kits -- thats been my first stop when the regular parts stores come up empty on older International stuff. The key is having your transmission specs ready before you call, because the clutch sizing depends more on...
I'd check that in-tank pickup install before worrying about the pump — you had a solid month of it working, and the FF light kicking in at specific RPMs sounds more like an air leak on the suction side than pump failure. Maybe it wasn't sealed right?
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