1958 CADILLAC SERIES 62

Typical onset: 80,000+ mi original, or any mileage if poorly maintained

Symptoms: Slipping between gears, especially 2nd to 3rd, Delayed engagement when shifting into Drive, Metal shavings in pan, burnt fluid smell, Complete loss of forward gears

Fix: Full rebuild required—these four-speed Hydra-Matics are complex with multiple clutch packs and bands. Expect 16-24 hours labor plus hard parts (clutches, seals, bearings, bands). Few shops still rebuild these; specialists charge premium rates.

Estimated cost: $3,500-6,500

Typical onset: 100,000+ mi, or sooner with oil neglect

Symptoms: Deep knocking sound at idle, worse when warm, Low oil pressure (under 10 psi at idle hot), Metallic debris on magnetic drain plug, Oil consumption increase

Fix: Engine-out rebuild or bearing replacement in-chassis if caught early. Main bearings alone: 18-22 hours. Full rebuild with rings, bearings, timing chain, oil pump: 30-40 hours. Original tolerances were loose by modern standards; these engines leak and burn oil even when 'healthy.'

Estimated cost: $4,500-9,000

Symptoms: Transmission fluid puddles under front of car, Fluid level drops rapidly, Corrosion-induced pinhole leaks or cracked fittings at radiator, Transmission overheating if unnoticed

Fix: Steel lines rot from the inside out after decades. Replace both lines from transmission to radiator—4-6 hours labor. Original NOS lines are scarce; custom fabrication or universal replacement kits required. Flush cooler in radiator during replacement.

Estimated cost: $400-800

Typical onset: 90,000+ mi

Symptoms: Excessive crankshaft endplay (clunking when clutch released—though most are automatics), Metallic grinding during starts, Oil pressure fluctuations, Can lead to catastrophic crank walk and block damage

Fix: Requires engine removal and crankshaft R&R to replace thrust bearings and possibly machine crank journals. 24-32 hours labor. If crank is scored, regrinding or replacement adds significantly to cost. This is why 'engine rebuild' jobs are so common in these.

Estimated cost: $3,000-5,500

Symptoms: Clunking into gear, Excessive driveline vibration, Transmission tail housing sags visibly, Shifter feels sloppy or binding

Fix: Rubber mounts deteriorate after 20+ years regardless of mileage. Replacement is straightforward: support transmission, unbolt old mount, install new—2-3 hours. Reproduction mounts widely available but quality varies.

Estimated cost: $200-400

Typical onset: 80,000+ mi

Symptoms: Blue smoke on startup and acceleration, Quart of oil every 500-800 miles, Low compression across multiple cylinders, Heavy carbon buildup on plugs

Fix: Rings wear due to age, thermal cycling, and old metallurgy. Ring replacement requires full teardown: pistons out, hone cylinders, new rings—30-35 hours if doing properly with deck surfacing. Often combined with full rebuild since engine is already apart.

Estimated cost: $4,000-7,500

Symptoms: Exhaust ticking or popping on warmup, Broken or missing manifold studs, Visible cracks in cast-iron manifolds, Soot marks at manifold-to-head gasket

Fix: Cast manifolds crack from thermal stress over decades. Broken studs drill out and re-tap in head—tedious work, 6-10 hours per side if all studs need extraction. Used manifolds plentiful but often cracked themselves; some weld and resurface them.

Estimated cost: $800-1,500