A 318 powered truck is probably the most common. A 73 may have 4 wheel drum brakes.
Starting 1973, all V8 cars and light trucks came with front disc brakes.
Not 4wd trucks. 1975 was the 1st year for discs on them. The 74 Ramcharger may have had discs though. I'd have to look it up.
Disk were standard on 4x2s starting in 72 (drums were an option)
4x4s disk were standard on ALL models under 400 series the heavier series had drum in till the SEG (special equipment group) closed shop
After 35 years and parting out/scraping over 250 of these trucks I have only every come across 2 post 71's 4x4s with disk one was 72 W200 and the other was a 73W300
