The 1964 Riviera is a first-generation personal luxury coupe with Buick's legendary Nailhead V8s (401 or 425 cubic inch). These are robust engines when maintained, but the two-speed Turbine Drive automatic transmission and 60-year-old cooling/fuel systems dominate the repair landscape.
Turbine Drive (Two-Speed) Transmission Failures
Common · high severityTypical onset: original units often fail between 60,000-90,000 mi, though many survivors have already been rebuilt
Symptoms: Slipping between first and second gear or no upshift at all, Delayed engagement when shifting into drive or reverse, Transmission overheating, especially in stop-and-go traffic, Red fluid leaking from torque converter area or cooler lines
Fix: Complete rebuild with new clutches, seals, and bands is standard. Expect 12-16 hours labor for removal, rebuild, and reinstall. Many shops source rebuilt cores due to parts scarcity for this two-speed unit.
Estimated cost: $2,800-4,200
Nailhead Engine Oil Consumption and Ring Wear
Common · medium severityTypical onset: 70,000-120,000 mi on original rings
Symptoms: Blue smoke on startup or during acceleration, Burning through a quart of oil every 500-800 miles, Fouled spark plugs, particularly on cylinders 2, 4, 6, 8, Loss of power and poor fuel economy
Fix: Piston ring replacement requires engine removal in most cases due to limited bay access. Budget 20-28 hours for pull, disassembly, hone, re-ring, reassemble, and reinstall. Often combined with valve job and bearing inspection.
Estimated cost: $3,500-5,500
Transmission Oil Cooler Line Ruptures
Occasional · high severityTypical onset: not mileage-driven; age and rust are primary factors
Symptoms: Sudden loss of transmission fluid, visible puddle under car, Transmission slipping or complete loss of drive within minutes, Hissing sound near radiator or along frame rails, Fluid spraying onto exhaust manifolds causing smoke
Fix: Replace both steel cooler lines from transmission to radiator. Lines rust from inside out on these cars. Fabrication or NOS parts required; 3-5 hours labor including proper flaring and routing.
Estimated cost: $400-750
Carburetor Flooding and Fuel System Varnish
Common · medium severitySymptoms: Hard starting when hot, especially after short stops, Fuel smell in cabin or garage after shutdown, Rough idle and hesitation off idle, Raw fuel dripping from carburetor base or air cleaner
Fix: Carter AFB four-barrel carbs (425 engine) or Rochester two-barrel (401) need complete rebuild with modern ethanol-compatible gaskets. Fuel filter replacement and line inspection essential. 4-6 hours for carb rebuild and system cleaning.
Estimated cost: $600-950
Crankshaft Main Bearing Wear
Occasional · high severityTypical onset: 100,000+ mi or engines with documented oil neglect
Symptoms: Deep knocking sound from lower engine block, worse under load, Low oil pressure at idle (under 10 psi hot), Metallic debris in oil filter or pan, Vibration felt through entire drivetrain
Fix: Requires complete engine removal and crankshaft inspection. Machine work for journal grinding common. Plan 24-32 hours for R&R, disassembly, machine shop time, reassembly with new bearings, seals, and gaskets.
Estimated cost: $4,500-7,000
Transmission Mount Deterioration
Common · low severityTypical onset: mounts are 60 years old; all need inspection regardless of mileage
Symptoms: Clunking when shifting from park to drive or reverse, Excessive vibration at idle in gear, Visible sagging of transmission tailshaft, Driveline shudder during acceleration
Fix: Replace rubber transmission mount and inspect crossmember for rust. Simple job if you can get the car on a lift; 1.5-2.5 hours labor.
Estimated cost: $180-350
Buy one if you're handy or have a trusted independent shop—these are durable classics when sorted, but the two-speed transmission and age-related fuel/oil system issues mean you need a $3,000-5,000 post-purchase sorting budget.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.