1972 BUICK SKYLARK

Typical onset: 80,000-120,000 mi original, but many survivors have unknown history

Symptoms: Slipping between gears, especially 1-2 shift, Delayed engagement into drive or reverse, Red fluid with burnt smell, Whining or grinding noises under acceleration

Fix: Full rebuild required in most cases — 8-12 hours labor. Includes bands, clutches, seals, filter, torque converter inspection. These transmissions are rebuildable but parts quality varies. Transmission cooler lines and radiator cooler often need replacement at same time.

Estimated cost: $1,800-3,200

Typical onset: 100,000+ mi, or unknown maintenance history

Symptoms: Heavy knocking or rod knock at idle, worse when warm, Low oil pressure at idle (under 10 psi), Metal shavings in oil or on magnetic drain plug, Blue smoke on startup or deceleration

Fix: Connecting rod and main bearings are the usual culprits — 18-24 hours for in-chassis work if crank is salvageable. If crank needs machining or pistons/rings are worn, goes to full rebuild territory at 30-40 hours. The 350 and 455 are worth rebuilding; 250 I6 may not be economically viable.

Estimated cost: $2,500-6,500

Typical onset: 90,000-140,000 mi

Symptoms: Excessive oil consumption (1 qt per 500-800 miles), Blue smoke on acceleration or when engine is under load, Fouled spark plugs, Loss of compression across multiple cylinders

Fix: Requires engine removal and complete teardown — 25-35 hours. Cylinders honed or bored oversized, new rings, often new pistons. If doing this work, smart to address bearings, timing components, and gaskets at same time. Essentially a full rebuild.

Estimated cost: $3,500-5,500

Symptoms: Hard starting when cold or hot, Rough idle or stalling at stop lights, Hesitation or flat spot on acceleration, Gas smell from engine bay, visible leaks at carb base

Fix: Rochester 2-barrel or 4-barrel carbs need rebuild kits every 10-15 years regardless of mileage due to dried gaskets and varnish. 3-5 hours for proper rebuild including adjustment. Fuel filters clog quickly on old tanks with rust. Fuel pump (mechanical) failures also common — 1 hour job.

Estimated cost: $350-750

Symptoms: Clunking when shifting into gear, Excessive vibration at idle in gear, Visible engine movement when revving, Transmission tunnel heat and noise

Fix: Rubber mounts dry-rot after decades regardless of miles. Transmission mount is 1-2 hours, engine mounts 2-3 hours. Inexpensive parts but labor adds up if doing all at once. Should be checked during any major service.

Estimated cost: $250-600

Symptoms: Running hot in traffic or on highway, Coolant leaks from water pump or radiator, Heater core leaks (passenger floor wetness), Collapsed lower radiator hose

Fix: Original radiators are often clogged or have compromised cores. Re-core or replace — 3-4 hours. Water pump failures common — 2-3 hours. Transmission cooler built into radiator can cross-contaminate fluids if it fails internally, destroying transmission. Inspect carefully.

Estimated cost: $400-1,200