1957 CADILLAC FLEETWOOD 75

Typical onset: any mileage after 60+ years

Symptoms: Slipping between gears especially 2nd-3rd shift, Delayed engagement when shifting into Drive or Reverse, Transmission fluid dark or burnt smelling, Harsh or banging shifts under load

Fix: Full teardown rebuild of the four-speed Hydra-Matic with new clutch packs, seals, bands, and often the oil cooler lines which corrode internally. Expect 18-24 hours labor plus parts. Transmission R&R is 8-10 hours alone on this chassis due to length and weight.

Estimated cost: $3,500-5,800

Typical onset: 80,000-150,000 mi or unknown history

Symptoms: Oil pressure drops below 10 psi at hot idle, Metallic knocking from lower engine especially when warm, Metal shavings or glitter in oil filter, Sudden loss of oil pressure warning

Fix: Worn main and rod bearings require full engine teardown. With the engine out, machine work on crank journals is common (0.010"-0.020" undersize). Pistons and rings typically replaced at same time. Engine R&R is 14-16 hours, machine work and reassembly adds 20-28 hours total labor.

Estimated cost: $6,500-9,500

Symptoms: External coolant leaks at head/block junction, usually rear cylinders, White smoke from exhaust on startup, Coolant loss with no visible external leaks, Overheating especially at highway speeds

Fix: The 365's head bolts stretch over decades and original composite gaskets fail. Both heads come off together (in-car job takes 12-16 hours). Decking the heads adds cost. Original intake manifold gaskets always replaced simultaneously. Parts availability for correct gaskets is spotty.

Estimated cost: $2,800-4,200

Symptoms: Hard starting especially when hot, Rough idle or stalling at stops, Hesitation or stumble on acceleration, Fuel smell from engine bay

Fix: The Carter WCFB four-barrel carburetor has tiny passages that clog with modern ethanol fuel. Requires complete disassembly, ultrasonic cleaning, new gaskets, and float adjustment. Fuel tank often needs boiling out or replacement (16 gallon capacity, access requires rear seat and trunk pan removal - 6 hours). Fuel pump diaphragm replacement common. Total 8-12 hours for full fuel system service.

Estimated cost: $1,200-2,400

Symptoms: Clunking when shifting into gear, Vibration at specific RPM ranges, Transmission appears to sag or sit low, Driveline vibration especially on acceleration

Fix: Rubber transmission mount turns to powder after 65 years. The crossmember itself often cracks where it meets the frame rails due to weight of this long-wheelbase car. Mount replacement is 2-3 hours; crossmember welding/replacement adds 4-6 hours and requires transmission support.

Estimated cost: $800-1,800

Symptoms: Temperature gauge creeping into red zone, Coolant leaking from water pump weep hole, Poor heat output from cabin heater, Radiator core visibly blocked or corroded through

Fix: Original copper-brass radiators are usually clogged or have pinhole leaks. Recoring costs $600-900 and takes 2 weeks. Water pump replacement is straightforward (3-4 hours) but NOS pumps are hit-or-miss quality. Thermostats stick closed frequently. Budget 6-8 hours for complete cooling system overhaul with radiator R&R.

Estimated cost: $1,500-2,800