1960 CADILLAC SEDAN DE VILLE

Symptoms: Slipping between gears, especially 2nd to 3rd, Delayed engagement when shifting to Drive, No reverse or intermittent reverse, Transmission fluid discoloration or burnt smell

Fix: The 4-speed Hydra-Matic in these cars is now 60+ years old and most need complete rebuilds. Expect 12-16 hours for removal, rebuild, and reinstallation. Finding a shop experienced with these older units is critical—they're different from later transmissions. Includes new seals, clutches, bands, and often the oil cooler lines which rot out.

Estimated cost: $2,800-4,500

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

Symptoms: Blue smoke on startup that clears after warmup, Consuming 1 quart per 500-800 miles, Oil fouling on spark plugs, Low compression readings on multiple cylinders

Fix: Valve guide seals harden and crack with age. A complete valve job addresses this properly—requires head removal, valve grinding, new guides and seals. Many engines at this age also have worn piston rings contributing to oil burning. If rings are gone too, you're looking at a full rebuild with 25-35 hours labor.

Estimated cost: $1,800-3,200 for valve job only; $5,000-8,500 for complete engine rebuild

Typical onset: 100,000+ mi or unknown history with poor oil maintenance

Symptoms: Deep knocking sound from bottom end at idle, Low oil pressure at operating temperature, Metallic debris in oil pan, Vibration that worsens with RPM

Fix: The 390's main and rod bearings wear, and if oil changes were skipped, the crank journals get scored. Requires complete teardown, crank removal for machining or replacement, new bearings, and often line boring the mains. This is a 30-40 hour job and often discovered during a planned rebuild.

Estimated cost: $4,500-7,000

Symptoms: External coolant leaks from head/block interface, White smoke from exhaust, Coolant mixing with oil (milky dipstick), Overheating despite good radiator and water pump, Bubbles in radiator when running

Fix: The 390 has a history of head gasket failure, especially if it's been overheated even once. Both heads typically need to come off, surfaces milled flat, new gaskets, and new head bolts. Allow 14-18 hours. Often done in conjunction with valve work since the heads are off anyway.

Estimated cost: $2,200-3,800

Symptoms: Hard starting when cold, Rough idle or stalling, Hesitation on acceleration, Flooding and raw fuel smell, Black smoke from rich running

Fix: Cars sitting for extended periods develop varnished carburetors (Rochester 4-barrel). Complete carb rebuild with new gaskets, needle/seat, accelerator pump, and often new fuel lines from tank forward. Fuel filters clog quickly after sitting. Tank may need cleaning or replacement if heavily rusted inside. 4-6 hours for full carb rebuild and fuel system flush.

Estimated cost: $650-1,200

Symptoms: Clunking when shifting from Park to Drive, Excessive driveline vibration, Transmission sag visible from underneath, Harsh engagement into gear

Fix: Rubber transmission mounts rot out after 60 years. The cross-member itself can also crack from rust, especially in salt states. Replacement is straightforward—support the transmission, unbolt old mount, install new. 2-3 hours labor. Reproduction parts are available but quality varies.

Estimated cost: $350-650

Symptoms: Overheating in traffic despite new thermostat, Coolant loss with no visible external leaks, Sweet smell inside cabin, Fogged windshield with oily film, Green coolant puddles under passenger side

Fix: Original copper-brass radiators develop internal blockages and pinhole leaks. Heater cores buried in the dash leak onto the floor and fog windows. Radiator can be re-cored (8-10 hours with removal) or replaced. Heater core requires dash disassembly—allow 10-12 hours labor for that nightmare job.

Estimated cost: $800-1,400 for radiator; $1,200-2,000 for heater core