The 1977 Plymouth Fury represents Chrysler's full-size platform with proven LA and slant-six engines, but suffers from typical late-70s Mopar gremlins including lean-burn electronics, transmission woes, and rust-prone unibody construction that can hide structural decay until it's expensive.
Lean-Burn System Failures (318/360 V8 models)
Common · medium severityTypical onset: 60,000-90,000 mi
Symptoms: Stalling when warm, Surging at cruise, Hard starting, Dying at idle, No-start conditions with good spark
Fix: Lean-burn computer and pickup modules fail frequently. Most experienced techs bypass the entire system and convert to traditional points or HEI distributor (3-4 hours labor). Chasing bad modules without converting wastes time and money.
Estimated cost: $400-700
A727/A904 TorqueFlite Transmission Overheating and Failure
Common · high severityTypical onset: 80,000-130,000 mi
Symptoms: Delayed 1-2 shift when hot, Slipping under load, Burnt fluid smell, No reverse or erratic reverse engagement, Hard 2-3 shift followed by slip
Fix: Factory cooler undersized, kickdown linkage wears causing band/clutch damage. Full rebuild with upgraded bands, clutches, and proper external cooler installation runs 12-16 hours labor. Band adjustment alone buys time if caught early (1 hour).
Estimated cost: $1,800-3,200
Timing Chain Stretch and Failure (All V8s)
Common · high severityTypical onset: 100,000-150,000 mi
Symptoms: Rattling from front of engine on cold start, Retarded timing that won't adjust properly, Backfiring through carburetor, Hard starting despite tune-up, Engine runs but lacks power
Fix: Factory single-row chains stretch badly, causing jumped timing or total failure. Requires timing cover removal, new chain/gear set, oil pan gasket work. Count on 6-8 hours labor. 225 slant-six uses gear-driven cam and rarely has this issue.
Estimated cost: $650-1,100
Carburetor Issues (Carter BBD Two-Barrel)
Common · low severitySymptoms: Black smoke and flooding, Stumble off idle, High idle that won't come down, Fuel leaking from throttle shafts, Poor fuel economy (under 10 mpg)
Fix: Worn throttle shafts cause vacuum leaks, floats sink, and accelerator pump circuits clog. Rebuilds help temporarily but worn bodies need replacement. Rebuild kit installation 2-3 hours, replacement carburetor swap 1.5 hours. Many convert to Holley 2-barrel for reliability.
Estimated cost: $250-500
Front Suspension and Steering Box Wear
Common · medium severityTypical onset: 70,000-110,000 mi
Symptoms: Wandering at highway speed requiring constant correction, Clunking over bumps, Excessive play in steering wheel (more than 2 inches), Uneven tire wear on inside edges, Loose feel through center
Fix: Upper control arm bushings, idler arm, and steering box develop slop. Steering box adjustment helps briefly but rebuilds or replacement needed. Full front-end rebuild with box swap 8-10 hours. These cars are heavy and eat suspension parts faster than A-bodies.
Estimated cost: $1,200-2,000
Unibody Rust in Frame Rails and Rear Leaf Spring Mounts
Common · high severitySymptoms: Visible rust perforation in rear frame rails, Sagging rear end on one side, Leaf spring shackles pulling through metal, Crunching sound from rear when hitting bumps, Floor pan rust-through behind rear seat
Fix: Chrysler's thin-gauge unibody steel corrodes badly, especially where rear springs mount and front frame rails meet the firewall. Proper repair requires sectioning and welding new metal (15-25 hours labor). Surface rust hides structural failure. Avoid cars from salt states unless fully inspected underneath.
Estimated cost: $2,500-5,000
Electrical Gremlins: Ballast Resistor and Bulkhead Connector Burnout
Occasional · medium severitySymptoms: Intermittent no-start after running hot, Gauges cutting in and out, Ammeter showing discharge then normal, Melted plastic smell from firewall, Voltage drop across bulkhead connector
Fix: Ballast resistors fail regularly (keep spare in glovebox, 15-minute swap). More serious: bulkhead connectors overheat due to undersized wiring for alternator load, melting terminals. Proper fix involves bypassing with separate alternator feed and cleaning all terminals (3-4 hours labor for full bulkhead rebuild).
Estimated cost: $15-50 for resistor, $400-700 for bulkhead rework
Buy a rust-free slant-six car from the Southwest and you'll have a reliable, cheap-to-run land yacht; avoid rusty V8 examples from salt states unless you're prepared for expensive rust repair and lean-burn headaches.
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.