1969 CADILLAC DEVILLE

Symptoms: Transmission fluid pooling under vehicle, Pink or red fluid dripping near radiator, Slipping transmission from low fluid, Overheating transmission

Fix: Steel cooler lines rust through after decades of exposure. Replacement requires removing lines from radiator to transmission, often fighting seized fittings. Allow 2-3 hours labor plus new lines and fluid refill. Original-style steel lines or braided stainless options available.

Estimated cost: $300-600

Typical onset: 80,000-150,000 mi

Symptoms: Heavy blue smoke on startup, Knocking or tapping from bottom end, Oil pressure dropping below 10 psi hot idle, Excessive oil consumption (1 qt per 500 miles or worse)

Fix: These 472ci engines were durable but most survivors have deferred maintenance histories. Worn rings cause blowby and oil burning; spun bearings from low oil changes cause rod knock. Full rebuild requires engine removal (8-10 hours), machine work, and reassembly. Budget 35-45 total shop hours for complete rebuild including R&R.

Estimated cost: $4,500-7,500

Typical onset: 100,000+ mi

Symptoms: Coolant loss with no visible leaks, White smoke from exhaust, Oil contaminated with coolant (milky dipstick), Overheating, Rough idle or misfire

Fix: Composite gaskets from this era degrade over time. Both heads typically done together due to labor overlap. Requires manifold removal, head removal, resurfacing, and reassembly. Expect 12-16 hours labor. Good time to address valve seals and check for cracks.

Estimated cost: $1,800-3,200

Typical onset: 70,000-120,000 mi

Symptoms: Delayed engagement into gear, Harsh 1-2 or 2-3 shifts, Slipping under load, No reverse or forward gears

Fix: The TH400 is bulletproof when maintained but most '69s have unknown service history. Clutch pack wear and worn seals are typical. Full rebuild requires removal (4-5 hours), teardown, and rebuild (10-12 hours). Includes new clutches, bands, seals, and filter. Torque converter inspection critical.

Estimated cost: $2,200-3,800

Symptoms: Hard starting after sitting, Stalling at idle, Fuel smell in garage, Rough running or hesitation, Fuel leaks from tank or lines

Fix: Original rubber fuel lines, carburetor components, and tank coatings dissolve in E10 gas. Requires replacing all rubber fuel line (2-3 hours), rebuilding or replacing carburetor (3-4 hours), potentially tank cleaning or replacement (4-6 hours). Inline fuel filter clogs frequently—check every 5,000 miles.

Estimated cost: $800-2,500

Symptoms: Clunk when shifting into drive or reverse, Excessive vibration at idle in gear, Visible transmission sag, Driveline vibration under acceleration

Fix: Rubber deteriorates after 50+ years. Requires supporting transmission weight, removing old mount, installing new. Simple 1-2 hour job but transmission must be properly supported to prevent damage to cooler lines or crossmember.

Estimated cost: $150-350