1964 PONTIAC BONNEVILLE

Typical onset: Original units often fail by 80,000-120,000 mi, but most have been rebuilt at least once

Symptoms: Slipping between 2nd and 3rd gear under load, Delayed engagement when shifting to Drive, Metal shavings in pan during fluid changes, Complete loss of forward gears

Fix: Full rebuild required — internal clutch packs and bushings wear out, governor valve sticks. Expect 12-16 hours labor for R&R and rebuild. Hard parts often need replacement due to scoring.

Estimated cost: $2,200-3,800

Symptoms: Raw fuel smell after sitting, especially when hot, Hard starting when engine is warm, Black smoke and poor fuel economy, Erratic idle or stumbling on acceleration

Fix: Original Carter AFB carbs need complete rebuild kits — float needles wear, accelerator pump diaphragms crack, gaskets shrink. 3-5 hours for proper rebuild and tuning. Many owners swap to Edelbrock 1406 for reliability.

Estimated cost: $400-800

Symptoms: Visible rust-through on frame rails near rear spring mounts, Sagging rear end or uneven ride height, Cracking or flaking paint on undercarriage, Body mounts pulling through rusty metal

Fix: Northern and coastal cars often have severe perimeter frame rot. Repair requires cutting out sections and welding in patch panels or replacing entire rail sections. 20-40 hours depending on extent. This is a deal-breaker inspection point.

Estimated cost: $3,000-8,000

Typical onset: 60,000+ mi or age-related seal deterioration

Symptoms: Drips under front of engine on driver side, Groaning noise when turning at low speed, Stiff steering when cold, loosens up when warm, Low power steering fluid despite no visible external leaks (gearbox internal leak)

Fix: Saginaw pump seals fail, and the integral power steering gear develops sector shaft seal leaks. Pump rebuild is 2-3 hours, gearbox rebuild or replacement is 4-6 hours. Hoses also crack and weep.

Estimated cost: $500-1,200

Symptoms: Dim headlights at idle, brighter at higher RPM, Battery dies after short drives or with accessories running, Ammeter gauge shows discharge at idle, Corroded or burnt voltage regulator connections

Fix: Original generators struggle with modern electrical loads and corroded voltage regulators fail. Rebuild generator (brushes, bearings) or convert to internally-regulated alternator. Generator rebuild is 2-3 hours, alternator swap with bracket fabrication is 3-5 hours.

Estimated cost: $300-700

Typical onset: 70,000-100,000 mi

Symptoms: Gear oil puddles inside rear brake drums, Howling or whining from rear end that changes with speed, Clunking when shifting from Drive to Reverse, Rear brakes soaked with oil, causing reduced braking

Fix: Axle seals harden and leak into brake assemblies. Carrier bearings wear on high-mileage units. Seal replacement is 3-4 hours per side including brake cleaning. Full differential rebuild with bearings and gear setup is 8-12 hours.

Estimated cost: $400-1,800

Symptoms: Fuel gauge reads empty or stuck at full regardless of fuel level, Rust particles clog fuel filter repeatedly, Fuel leaks from seams after sitting with ethanol fuel, Engine starvation or stumbling from sediment blockage

Fix: Original steel tanks rust from inside out, especially with modern ethanol fuel. Sending units fail from corrosion. Tank must be dropped (4-5 hours), cleaned/sealed or replaced, new sender installed. Most shops recommend full replacement with reproduction tank.

Estimated cost: $600-1,200