1974 CADILLAC FLEETWOOD 75

Symptoms: Transmission fluid pooling under vehicle near radiator, Pink fluid mixing with coolant in overflow, Harsh shifting or slipping after coolant contamination, Overheating transmission

Fix: Steel cooler lines rust through at flex points or where they connect to the radiator. Replacement involves new lines, fittings, and often a full fluid flush. If coolant got into trans, expect internal damage requiring rebuild. 3-5 hours labor for lines alone, 15-20 hours if rebuild needed.

Estimated cost: $400-800 (lines only), $2,200-3,500 (with trans rebuild)

Typical onset: 120,000-180,000 mi

Symptoms: Deep knocking from bottom end at idle, Metallic rattling that worsens with RPM, Low oil pressure warning especially when hot, Metal shavings in oil

Fix: The 472 had marginal oiling to the mains under sustained load, especially in heavy limousine duty. Requires full engine teardown, crank inspection/machining, and bearing replacement. Most shops recommend short block or full rebuild at this point. 25-35 hours labor.

Estimated cost: $3,500-6,000

Typical onset: 80,000-150,000 mi

Symptoms: White smoke from exhaust on cold start, Coolant loss with no visible leaks, Oil milkshake on dipstick or filler cap, Overheating or rough idle

Fix: The 472's factory head bolts and gaskets don't age well. Cylinder head warpage is common if it's been overheated even once. Heads must be pulled, resurfaced, and gaskets replaced with modern composition gaskets. New head bolts mandatory. 18-24 hours labor for both banks.

Estimated cost: $2,800-4,200

Symptoms: Clunk when shifting from Park to Drive, Excessive vibration at idle in gear, Visible sag of transmission tailshaft, Transmission hitting crossmember on acceleration

Fix: The rubber mount deteriorates from age and the sheer weight of the THM400. Replacement requires supporting the transmission and unbolting the old mount. Straightforward job. 1.5-2 hours labor.

Estimated cost: $200-350

Symptoms: Hard starting when engine is hot, Stalling after short drives in warm weather, Fuel smell in cabin or engine bay, Rough idle or hesitation under load

Fix: Original steel fuel lines rust from inside out, and rubber sections near the pump crack. The 472 also runs hot and causes vapor lock with modern ethanol fuel. Full fuel line replacement from tank to carb plus filter and pump inspection. 4-6 hours labor.

Estimated cost: $600-1,000

Typical onset: 150,000+ mi

Symptoms: Sudden catastrophic loss of oil pressure, Engine seizes without warning, No oil pressure at any RPM, Metal fragments in oil pan

Fix: The oil pump drive shaft on the 472 can shear or the cam gear can strip teeth, killing oil pressure instantly. Requires engine removal, full teardown, and crank/cam inspection. Usually discovered after engine damage has occurred. 30-40 hours labor for full R&R and rebuild.

Estimated cost: $5,000-8,000