1971 CHEVROLET CAPRICE

Symptoms: Hard starting when cold or hot, Rough idle and stalling at stops, Black smoke from exhaust indicating rich mixture, Hesitation or stumble on acceleration, Poor fuel economy below 8-10 mpg

Fix: Rochester Quadrajet carbs have internal rubber components and gaskets that harden after decades. Full rebuild with quality kit takes 3-4 hours for experienced tech, includes float adjustment, choke calibration, and idle mixture screws. Many shops opt for remanufactured unit swap (2 hours) to avoid comebacks.

Estimated cost: $450-850

Typical onset: 80,000+ mi or age-related regardless of miles

Symptoms: Loud clunk when shifting from Park to Drive or Reverse, Vibration through floorboards at idle in gear, Visible driveline angle misalignment, Transmission tail housing sitting low

Fix: Original rubber mounts turn to mush after 50 years. Requires transmission support, mount replacement, and often crossmember reinforcement if rust present. 2-3 hours labor. Inspect driveshaft U-joints and carrier bearing while transmission is supported.

Estimated cost: $250-500

Symptoms: Visible rust-through on frame rails behind front wheels, Sagging or misaligned body panels, Cracks in frame near body mount locations, Steering box mounting area deterioration, Trunk floor and rear frame rust in northern cars

Fix: Salt-belt and high-humidity cars develop serious frame rot. Front subframe corrosion near steering box is safety-critical. Proper repair requires frame-off work, cutting out bad sections, and welding in patches or replacement sections. 40-80 hours depending on severity. Many cars are totaled economically at this point.

Estimated cost: $4,000-12,000

Typical onset: 70,000-120,000 mi

Symptoms: Delayed engagement when cold, Slipping between gears under load, Burnt transmission fluid smell, No factory transmission cooler or failed cooler lines, Transmission running hot to touch after highway driving

Fix: These transmissions are bulletproof but hate heat. Failed or missing auxiliary cooler accelerates fluid breakdown. Fluid and filter service every 30k miles prevents most issues (2 hours). If internal damage occurred, rebuild runs 12-16 hours. Always add external cooler during rebuild.

Estimated cost: $180-300 for service, $1,800-2,800 for rebuild

Typical onset: 120,000-180,000 mi

Symptoms: Blue smoke on startup clearing after warmup, Oil consumption exceeding 1 quart per 500-800 miles, Loss of compression and power, Excessive blowby visible at PCV valve or oil filler cap, Wet fouled spark plugs

Fix: High-mileage small-block Chevys develop ring wear and cylinder glazing. Proper fix is remove engine, disassemble, hone cylinders, install new rings and bearings. Takes 18-24 hours for complete ring job. If cylinders are worn beyond spec or heavily ridged, requires full bore and oversized pistons adding 8-10 hours and significant parts cost.

Estimated cost: $2,200-3,800

Symptoms: Stalling after sitting for weeks, Fuel filter clogging repeatedly, Difficulty starting after car sits overnight, Rough running that improves with fresh fuel, Rust flakes or sediment in fuel filter

Fix: Cars driven infrequently or stored improperly develop varnish in tank and fuel lines. Requires tank removal, cleaning or replacement, new fuel lines from tank to pump, fuel pump replacement, and carburetor cleaning. 6-9 hours labor. In-tank sock-style filter often disintegrates.

Estimated cost: $650-1,200

Typical onset: 90,000-140,000 mi

Symptoms: Excessive play in steering wheel (more than 2 inches free play), Groaning noise when turning at low speed, Fluid leaking from steering box sector shaft, Wandering on highway requiring constant correction, Hard steering when cold improving with warmup

Fix: Saginaw gear boxes wear internally and develop sector shaft seal leaks. Rebuilt box swap takes 3-4 hours including alignment. Inspect frame mount area for rust before installing replacement. Pitman and idler arms often need replacement simultaneously.

Estimated cost: $550-950