1967 BUICK RIVIERA

Typical onset: 60,000-100,000 mi or 40+ years age-related

Symptoms: Clunk when shifting from Park to Drive or Reverse, Excessive driveline vibration at highway speed, Transmission tailshaft sitting visibly low, Harsh shifts under acceleration

Fix: Replace transmission mount and inspect crossmember for cracks or rust-through. Often requires dropping exhaust. 2-3 hours labor if crossmember is sound, 6-8 hours if crossmember needs welding or replacement.

Estimated cost: $300-900

Symptoms: Pink fluid puddle under front of car (transmission fluid mixing with coolant), Transmission slipping or delayed engagement after short drives, Engine overheating due to fluid contamination in radiator, Milky or strawberry-colored transmission fluid on dipstick

Fix: Steel cooler lines rust through where they connect to radiator, or internal radiator cooler fails. Requires replacing lines, flushing cooling system AND transmission, sometimes replacing radiator. If contamination is severe, transmission rebuild often follows within 5,000 miles. 4-6 hours labor for lines and flush, add 12-18 hours if transmission needs rebuild.

Estimated cost: $600-1,200 for lines and flush, $2,200-3,800 if transmission rebuild needed

Typical onset: 100,000-150,000 mi or engines with deferred oil changes

Symptoms: Oil pressure dropping below 10 psi at hot idle, Knocking or rumbling from lower engine at startup, Metal flakes in oil filter or on drain plug magnet, Pressure warning light flickering at stops

Fix: 401, 425, and 430 Nailheads are known for eating main bearings if oil changes were skipped or wrong oil used. Requires engine pull, crank inspection and possible machining, new bearings, and reassembly. 18-24 hours labor for bearing replacement, add 6-10 hours if crank needs grinding.

Estimated cost: $2,500-4,500

Symptoms: Hard starting when cold, floods easily when hot, Stumble or hesitation on acceleration, Rough idle that smooths out above 1,500 rpm, Black smoke from exhaust under load

Fix: Old fuel leaves varnish in Rochester or Carter carburetors, plugging jets and passages. Requires carburetor removal, ultrasonic cleaning or rebuild, new fuel filter, and often new fuel pump if diaphragm is deteriorated. 3-5 hours labor for carb rebuild.

Estimated cost: $400-800

Typical onset: 120,000-180,000 mi

Symptoms: Blue smoke on startup that clears after warmup, Excessive crankcase pressure, oil filler cap pops off, Oil consumption over 1 quart per 500 miles, Loss of power, poor fuel economy

Fix: Nailhead V8s with original rings eventually wear, especially if driven short trips or idled extensively. Requires engine removal, honing or boring cylinders, new piston rings (or pistons if bores are worn). 20-28 hours labor for ring job, more if pistons need replacement.

Estimated cost: $2,800-5,000

Symptoms: Transmission shifts too early or too late under throttle, No passing gear when flooring accelerator, Transmission stays in lower gear too long, overrevving engine, Erratic shift points

Fix: Cable stretches, frays, or detaches at carburetor linkage. Often misadjusted by previous owners. Inspect cable for wear, replace if frayed, adjust per FSM specs. 1-2 hours labor for adjustment, 2-3 hours if cable needs replacement.

Estimated cost: $150-400