Lead additive if it is being worked hard. Easy highway cruise, no.
- Age of your tires and their pressure is a higher concern (Firestone Transforce has an excellent price/reputation in oilfield work). Monroe Reflex shocks
- The big one is: coolant + pump + hoses + thermostat (MR GASKET 4363, the old ROBERTSHAW HD piece [see pics; buy from this range]; ck for fit and temps). I'd also add Radiator Master RMI-25 to the propoer blend of new coolant. If the radiator is at all questionable, repair or replace. Same for fan, clutch and shroud. This system is likely the most problematic due to lack of maintenance, and most likely to leave you stranded. Fuel pump a close second.
(My first car, 1973, was a 1966 V8-428 Ford Country Squire with every single option. Test runs out of Dallas on FM-455 blasting through Sanger, TX part of the tuning regimen back then. The old FE Ford motor ain't exciting, but it is reliable).
- New exterior lamps, fuses, etc, just because they are old. Keep current ones as spares. HD flasher unit (electronic) if not already in place.
- Wiper blades and brake linings.
- Steering slop.
Record your mechanical baseline (maintenance/repairs). On a truck it is even more important than with a car, and work will show larger FE changes.
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