The chassis manual for your rig should give the various service intervals. Trust them, not DrewE.
Transmission fluid I think is every 30K miles per Ford, and is a pretty simple drain and refill (including the torque converter).
Brake fluid should be every few years; if it's been over, say, five years since it was changed, definitely have it replaced. Brake fluid tends to absorb water from the atmosphere over time, which in various ways can lead to not stopping when you want to stop.
Chassis lube points, what few there are, may well be about due for service.
After 80K miles, the shocks if original probably could use replacement as well. That's not so much directly a milage-related thing as a when needed thing.
Spark plugs, if original, are almost certainly due for replacement. Make certain the new ones are properly torqued with a torque wrench; the spark plug threads on the head of this era Ford engine are somewhat marginal and overstressing them can lead to plugs being ejected and nontrivial repair bills.
