1973 AMC MATADOR

Typical onset: 60,000-90,000 mi

Symptoms: Clunk when shifting from Park to Drive or Reverse, Excessive drivetrain vibration at idle, Visible sag of transmission tailhousing, Shifter feels loose or imprecise

Fix: AMC used rubber biscuit-style transmission mounts that deteriorate faster than competitors' designs. Replacement requires lifting transmission slightly with a jack, removing crossmember bolts, and swapping mount. Typically 1.5-2 hours labor. OEM-quality replacements are scarce; aftermarket polyurethane upgrades available.

Estimated cost: $150-300

Typical onset: 100,000-150,000 mi

Symptoms: Blue smoke on startup and deceleration, Oil consumption exceeding 1 quart per 500-800 miles, Loss of compression in one or more cylinders, Fouled spark plugs

Fix: The 258 I6 and 304/360 V8s were durable but the emissions-era lean tuning and lack of hardened valve seats accelerated ring and cylinder wear. Ring job requires full teardown: 12-16 hours for I6, 16-20 hours for V8. Bore and hone cylinders, install oversized pistons and rings, new bearings, reseal entire engine. Many shops recommend short block replacement instead due to labor overlap.

Estimated cost: $2,200-4,000

Typical onset: 120,000-180,000 mi

Symptoms: Deep knocking or rumbling from lower engine block, Low oil pressure at idle when warm, Metallic rattling that worsens under load, Metal shavings in oil or on magnetic drain plug

Fix: AMC engines are sensitive to oil change intervals; neglect leads to bearing failure. Requires full bottom-end teardown: crank removal, bearing surface inspection, possibly crank grinding or replacement. 14-18 hours labor for bearing replacement alone; if crank needs machining, add machine shop time and costs. Often more economical to swap in used or rebuilt engine.

Estimated cost: $2,800-5,500

Typical onset: 70,000-110,000 mi

Symptoms: Transmission fluid puddles under front of vehicle, Low transmission fluid level on dipstick, Burned transmission smell, Slipping or delayed engagement when fluid is low

Fix: Steel cooler lines rust through at fittings and along frame rail where road salt accumulates. Line replacement requires dropping lines from radiator and transmission, routing new lines, and refilling/bleeding system. 2-3 hours labor. Use pre-bent stainless or copper-nickel lines for longevity.

Estimated cost: $250-450

Symptoms: Rough idle, stalling at stoplights, Hesitation on acceleration, Black smoke from exhaust, Poor fuel economy (8-12 mpg typical becoming 6-9 mpg)

Fix: 1973 was first year of full emissions controls; Matadors got strangled with EGR valves, air pumps, and lean factory jetting. Carburetors (Carter BBD on I6, Motorcraft 2100 or Carter on V8s) gum up quickly. Rebuild kit plus re-jetting and EGR valve cleaning typically takes 3-4 hours. Many owners delete non-functional smog equipment for reliability.

Estimated cost: $300-600

Symptoms: Engine stumbles or dies under acceleration, Difficult starting when tank is below half, Fuel starvation at highway speeds, Visible rust or debris in fuel filter

Fix: Fifty-year-old fuel tanks rust internally; sediment clogs inline filter and carb jets. Filter replacement is 0.5 hours, but if tank is contaminated, requires removal, cleaning or replacement, and new fuel pump. Tank R&R is 4-6 hours. In-tank sending unit seals often leak as well.

Estimated cost: $120-200 filter only; $800-1,400 with tank service