Across 1. Brake pedal or steering wheel sensation 5. 1908 to 2004 GM brand, briefly 9. Snowbelt car’s undercarriage, often 10. Gauge measuring 8-Down current 11. Jag or Rolls-Royce drive, in a way (3,4) 12. CD-player button 13. Term for unmodified car 15. Fender flaws, frequently 20. Cooling system’s critical components 22. A thread-locking liquid 24. Slang for RWD car’s differential (4,3) 25. "One careful ____," used-car-ad words 26. Body portion under door 27. Revives a vintage vehicle

Down
1. Adjective describing piston’s construction
2. Broken-fastener extraction tool (4,3)
3. Car salesman’s quarry
4. Exhaust-system fasteners
6. Machine for brake-drum resurfacing
7. Mr. MacPherson’s suspension inventions
8. Unit of auto-electric current
14. Alignment-shop adjustment, sometimes
16. Viscosity-reducing lacquer additive
17. Some auto-electric problems, briefly
18. Unwanted oil-pan deposits
19. Briefly, paints containing mica particles
21. Unexpected engine stoppage
23. Surname, "Tomb Raider" driver Lara