Check where the backlash is (i.e. lock centre diff, etc). That year was about the time they fixed the gearbox lubrication problem, but it only takes 6 bolts to pull the pto plate off the t-case and check if there is any wear on the splines.
Plenty of tweaks for more power. But they can be a bit of a slug off-boost.
Vac pump runs off the back of the alternator.


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