1981 AMC CONCORD

Typical onset: 60,000-90,000 mi

Symptoms: clunking when shifting between drive and reverse, excessive drivetrain movement, vibration at idle in gear, visible sagging of transmission tailshaft

Fix: The rubber transmission mount deteriorates from heat and age. Replacement requires supporting the transmission, unbolting the old mount from the crossmember, and installing new. Expect 1.5-2 hours labor. Original-style mounts are still available but aftermarket quality varies.

Estimated cost: $150-300

Typical onset: 100,000-150,000 mi

Symptoms: delayed engagement into gear, slipping between shifts, overheating transmission fluid, whining or grinding noises, no movement in any gear

Fix: The Chrysler TorqueFlite automatics are generally reliable, but neglected fluid changes and towing abuse kill them. Rebuild involves R&R (4-6 hours), disassembly, new clutches, bands, seals, and torque converter. Many shops quote 12-16 hours total for a proper rebuild.

Estimated cost: $1,800-3,200

Typical onset: 80,000-120,000 mi

Symptoms: persistent ticking or tapping from valve cover area, noise loudest at cold start, loss of power if lifter fully collapses, noise may quiet down when warm or worsen

Fix: AMC inline-sixes use hydraulic lifters that fail from oil sludge, infrequent changes, or age. Requires valve cover removal, pushrod/rocker removal, and lifter extraction. Full lifter set replacement with adjustment takes 4-6 hours. Often done with valve cover gasket and pushrod inspection.

Estimated cost: $600-1,100

Typical onset: 90,000-140,000 mi

Symptoms: white smoke from exhaust, coolant loss with no visible leaks, oil in coolant or coolant in oil, overheating, rough idle or misfires

Fix: Overheating or age causes head gasket failure on the 258. Head removal, machining (often required due to warpage), new gasket set, and reassembly runs 8-12 hours. Many shops recommend valve job and new timing set while apart, adding cost and time.

Estimated cost: $1,200-2,400

Symptoms: hard starting when cold or hot, rough idle and stalling, poor fuel economy, hesitation on acceleration, flooding or fuel smell

Fix: The Carter BBD two-barrel is simple but suffers from worn throttle shafts, clogged jets, and dried-out gaskets after sitting. Rebuild kits are cheap and installation takes 2-3 hours including removal, disassembly, cleaning, and tuning. Alternatively, remanufactured units are available.

Estimated cost: $250-500

Typical onset: varies with maintenance

Symptoms: temperature gauge climbing into red, coolant boiling over, heater blowing cold air, steam from under hood, cracked radiator tanks

Fix: Original radiators are 40+ years old and fail from internal clogging or cracked plastic tanks (if replaced in the '90s). Water pumps also fail. Radiator replacement is straightforward (2-3 hours), but if overheating caused head gasket or block damage, costs escalate dramatically. Preventive flushing and hose replacement are critical.

Estimated cost: $400-800

Symptoms: visible rust holes in floor pans under carpet, soft or crumbling metal when probed, rust perforation behind rear wheels and rocker panels, sagging body mounts

Fix: Not a mechanical repair but a deal-breaker for safety and value. Rust repair requires cutting out bad metal, welding in patch panels or new floor sections, and undercoating. DIY with basic welding skills can save money, but professional restoration runs 20-40+ hours depending on severity.

Estimated cost: $1,500-5,000+