The 1970 Charger is a body-on-frame B-body with robust torsion-bar front suspension and leaf-spring rear. Its Achilles heel is 50+ years of rust, electrical gremlins from corroded connections, and worn-out suspension bushings that make these cars wander like a drunk sailor.
Torqueflite 727 Transmission Kickdown Linkage Wear & Adjustment
Common · medium severitySymptoms: delayed downshift when flooring it, transmission shifts at wrong RPM, poor fuel economy, harsh or late 3-2 downshift
Fix: The kickdown rod and bellcrank bushings wear out or seize from corrosion. Requires removing linkage, replacing bushings, proper adjustment with measurement tool. 1.5-2 hours labor if everything comes apart cleanly, double that if hardware is seized.
Estimated cost: $150-400
Torsion Bar Suspension Sag & Worn Lower Control Arm Bushings
Common · medium severityTypical onset: 80,000+ mi or age-related
Symptoms: car sits nose-low even after adjustment, clunking over bumps, steering wander and vague on-center feel, uneven tire wear on inside edges
Fix: Torsion bars lose tension over decades. Lower control arm bushings (especially front pivot) crack and separate. Requires torsion bar replacement or re-indexing, plus pressing new bushings into LCAs. Plan 6-8 hours for complete front-end refresh with alignment.
Estimated cost: $800-1,400
Frame Rail & Torque Box Rust
Common · high severitySymptoms: visible rust perforation in front frame rails behind grille, sagging rear leaf spring mounts, cracked metal around rear spring hangers, floor pan separation at torque boxes
Fix: Front frame rails rust from inside-out where they box in. Rear torque boxes (where subframe meets body) crack and rust through. Proper fix requires cutting out rust, welding in patch panels or replacement sections. 12-20+ hours depending on extent, often requires rotisserie access.
Estimated cost: $2,500-6,000
Timing Chain Stretch (LA & B/RB Engines)
Occasional · medium severityTypical onset: 80,000-120,000 mi
Symptoms: rattling on cold start for 2-3 seconds, engine runs rough at idle when hot, timing retarded 4-6 degrees from spec, backfiring through carburetor
Fix: Factory single-roller chains stretch, nylon cam gear teeth wear. Requires front accessory removal, timing cover off, replace chain/gears/tensioner with double-roller kit. 4-5 hours on small-block, 5-6 on big-block due to tighter engine bay.
Estimated cost: $450-750
Carburetor Float Bowl Varnish & Accelerator Pump Wear (Carter/Holley)
Common · low severitySymptoms: stumble on acceleration from stop, hard starting when hot, fuel leaking from bowl gaskets, hanging idle after deceleration
Fix: Ethanol fuel destroys old gaskets and leaves varnish. Accelerator pump diaphragms harden. Full rebuild with ethanol-compatible kit, ultrasonic cleaning recommended. 2-3 hours for Carter AVS/AFB, 2.5-3.5 for Holley 4-barrel.
Estimated cost: $250-500
Drum Brake Wheel Cylinder Leakage & Self-Adjuster Seizure
Common · medium severitySymptoms: brake fluid on inside of rear wheels, brake pedal goes to floor on second pump, parking brake ineffective, brakes don't self-adjust, require manual star-wheel adjustment
Fix: Rear wheel cylinders leak internally, contaminate shoes. Self-adjusters seize from rust. Requires drum removal, new wheel cylinders, shoes, springs, cleaning/freeing adjusters. Front drums less common but same drill. 3-4 hours all four corners.
Estimated cost: $400-700
Dash Harness Connector Corrosion & Ammeter Gauge Failure
Occasional · medium severitySymptoms: gauges intermittent or dead, ammeter pegged one direction, melted connector behind dash, electrical smell from instrument cluster, headlights dim when using accessories
Fix: Bulkhead connector on firewall corrodes, creates resistance and heat. Ammeter carries full alternator current through dash, studs can melt. Requires bulkhead connector repair or replacement, ammeter bypass with voltmeter conversion recommended. 3-4 hours for proper rewire.
Estimated cost: $300-600
Buy one if the frame and floors are solid—everything else is fixable, but rust repair costs more than the car's worth.
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.