1972 Chevrolet C10 — single clunk over small sharp bumps

This is usually cheaper to test than to guess. Get a real battery/charging test on the 1972 Chevrolet C10, not just resting voltage, before blaming a module. That's the branch I'd chase this week. If it doesn't change the out-the-door or the repair estimate, it's noise. I already checked the easy fluid levels.

Log the conditions before you spend. Capture voltage while the 1972 Chevrolet C10 is actually failing — after it restarts you've lost the clue. Don't erase codes until someone who can help has seen them. On “single clunk over small sharp bumps,” that was the fork that mattered for me. When does it actually happen? This is the version I'd tell a friend.