📝 Pre-94 trucks were R-12 from the factory; most are retrofitted to R-134a by now. Always replace the accumulator and orifice tube with a compressor, or the new one won't last.
⚠️ Verify before buying. Fitment varies by year, engine (4.3/5.0/5.7/7.4/6.5) and 2WD/4WD. Confirm against your VIN/build before ordering.