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Ford Bronco Full-Size · 1978–1996

Full-Size Bronco Trail Spare Parts Guide

The full-size Bronco's front end is its most trail-critical system. TTB radius arm bushings and front U-joints are the failure points to pack against. The 351W engine is reliable — maintain it and it won't let you down.

Universal Spare Parts — All Vehicles

Belts & Hoses

Fluids

Filters & Ignition

Fasteners & Hardware

Full-Size Bronco — Vehicle-Specific Spares

The TTB system is the primary target of the Bronco-specific list. Age and mileage on these trucks mean cooling system components are nearly as critical. Build the list to match your truck's known condition — if you've recently serviced the cooling system with new hoses and a thermostat, you can scale back there. If you haven't touched the TTB bushings in years, carry the repair kit.

TTB Radius Arm Bushings Carry: Energy Suspension polyurethane radius arm bushing kit — Radius arm bushings crack and wear with age and hard use. When they go, the front end wanders and the steering becomes unpredictable. The Energy Suspension kit is a field-replaceable repair with basic hand tools. Carry it on any serious trail run.
Front TTB U-joints — Safety Critical Carry: Front TTB axle U-joints (Spicer 5-760X or 5-297X depending on year) — The outer hub U-joint inside the TTB beam is the most common front-end failure. Check your year — part numbers differ between the Dana 44 and Dana 50 applications. Carry two. Replacing one on trail is a 45-minute job with the right tools.
Engine Oil Leaks Carry: Fel-Pro valve cover gasket + 1 extra quart oil + RTV — The 351W is tough but old trucks leak oil. An extra quart over your base two-quart carry handles the slow drip scenario. The Fel-Pro valve cover gasket is the most common sealer failure — it's a field job.
Cooling System Carry: Upper and lower radiator hoses + thermostat + extra coolant — The 351W cooling system is 30–40 years old on most trucks. Hoses that feel solid in the driveway can fail under trail heat and load. Carry both hoses, a thermostat, and a gallon of coolant as a complete cooling system kit.
Transfer Case Carry: BW1345/1356 ATF check + spare ATF — The BW chain-driven transfer cases use Mercon ATF. If the transfer case pops out of 4WD, the shift fork pads are worn — that's a shop repair. But low fluid is a trail fix. Carry ATF and check the level before you go.
5.8L EFI Injector O-rings (Late Trucks) Carry: EFI injector O-ring kit (5.8L EFI, late trucks) — The late-model 5.8L EFI injector O-rings harden with age and cause fuel leaks. If your truck has high miles on the injectors, carry the O-ring kit.

Fluid Reference

Correct Fluids — Full-Size Bronco

Pre-Trip Inspection Priorities

Before any serious trail run, inspect the radius arm bushings visually and by feel. Grab the radius arm and try to move it in the bushing — any play is a problem. Check the front TTB U-joints for any notchiness or binding through full steering lock. Squeeze all radiator hoses — stiffness or cracking means replace before the trip, not after.

Check the transfer case fluid. Many full-size Broncos on the trail have never had the T-case fluid changed. The BW cases run hot on trail use and the fluid degrades. A fresh fill of Mercon ATF costs $10 and buys you insurance.

Full-Size Bronco Field Verdict

TTB radius arm bushings and front U-joints are the two most trail-common failures on the full-size. Pre-trip check on both is mandatory — not optional. The 351W is reliable, but 30-plus-year-old cooling systems aren't. Carry the full cooling kit.