1971 PLYMOUTH BARRACUDA

Symptoms: Visible rust perforation in floor pans, particularly driver's side, Structural flex or cracking around rear leaf spring mounts, Trunk floor rust-through from water intrusion, Torque boxes crumbling where rear leaf springs attach

Fix: Full floor pan replacement requires body-off work or extensive cutting/welding from beneath. Figure 40-60 hours for comprehensive floor and torque box replacement with proper metal fabrication. Reproductions are available but fitment varies by supplier.

Estimated cost: $4,500-8,000

Typical onset: 80,000-120,000 mi

Symptoms: Rattling noise from timing cover at cold start that quiets when warmed, Erratic idle or hesitation under acceleration, Difficulty starting when hot, Timing retarded 4-8 degrees from factory spec

Fix: Timing chain replacement requires removing radiator, water pump, harmonic balancer, and timing cover. Replace chain, both gears, and tensioner as a kit. Cam gear can wear noticeably on high-mileage engines. 6-8 hours labor for experienced tech.

Estimated cost: $650-1,200

Symptoms: Clunking over bumps from front suspension, Uneven ride height side-to-side that won't adjust, Torsion bar adjuster bolt frozen or stripped, Visible rust scale or perforation in lower control arm pockets

Fix: K-member torsion bar sockets rust from road salt and trapped moisture. If severely corroded, K-member replacement is only safe fix—reinforcement plates are temporary. Lower control arms also rust through where torsion bars insert. 16-20 hours for K-member swap includes full front suspension R&R.

Estimated cost: $2,200-3,800

Symptoms: Intermittent gauge operation or complete instrument cluster failure, Headlights or turn signals working sporadically, Melted or burned bulkhead connector on firewall, Electrical accessories dying progressively over time, Ammeter showing discharge despite good alternator

Fix: The bulkhead connector melts terminals due to excessive current draw through inadequate gauge wire—endemic to 1970-74 Mopars. Clean and rebuild connector with dielectric grease as band-aid, but proper fix requires ammeter bypass and upgraded charging wire. Full harness replacement takes 20-25 hours.

Estimated cost: $800-2,500

Typical onset: 60,000-100,000 mi

Symptoms: Severe axle hop during hard acceleration, Wandering or loose rear end feel on highway, Clunking when shifting from drive to reverse, Visible cracking or complete bushing separation at spring eyes

Fix: Original rubber bushings deteriorate from age and stress. Front spring eyes are accessible, rears require spring removal. Polyurethane replacements last longer but transmit more vibration. 4-6 hours for complete four-bushing replacement per side.

Estimated cost: $600-900

Typical onset: varies—corrosion-driven

Symptoms: Sweet coolant smell in cabin, Coolant puddle passenger side floor, Windshield fogging excessively with heater on, Coolant loss with no external leaks visible

Fix: E-body heater core requires complete dash removal—one of Chrysler's worst designs. Expect 12-16 hours labor minimum. Core itself is $100-150 but accessibility makes this job expensive. While dash is out, replace all vacuum lines and blend door actuators.

Estimated cost: $1,800-2,800

Typical onset: varies—adjustment-driven

Symptoms: Stumble or bog when outboard carbs activate, Poor fuel economy even by 1971 standards, Outboard carbs not opening or opening too early, Linkage binding or sticking at throttle progression

Fix: Six-barrel linkage wears at pivot points and adjustment takes precision. Vacuum pods can fail. Center carb must be perfect before syncing outboards. Proper setup takes 3-4 hours by someone experienced with Holley triple setups. Parts availability mixed—NOS expensive.

Estimated cost: $400-800