1984 BUICK ELECTRA

Typical onset: 80,000-140,000 mi

Symptoms: slipping between 2nd and 3rd gear, delayed engagement into Drive or Reverse, burnt transmission fluid smell, loss of overdrive 4th gear

Fix: The TH200-4R overdrive automatic was undersized for these heavy cars and fails from worn clutch packs, broken bands, and torque converter issues. Full rebuild takes 8-12 hours including R&R. Many shops recommend upgrading internal components during rebuild to prevent repeat failure.

Estimated cost: $1,800-3,200

Typical onset: 60,000-100,000 mi

Symptoms: white smoke on startup, hard starting when warm, coolant loss with no external leaks, fuel in coolant or coolant in oil, catastrophic loss of power

Fix: The Oldsmobile 350 diesel has inadequate head bolt design leading to head gasket failure, cracked heads, and eventually cracked blocks. Fixing properly requires either complete engine rebuild with upgraded head studs (20-30 hours) or replacement with gas engine. Most owners swap to a 305 or 350 Chevy gas motor rather than rebuild the diesel.

Estimated cost: $3,500-6,500

Typical onset: any mileage in rust belt cars

Symptoms: red transmission fluid spots on driveway, fluid dripping from radiator area, low transmission fluid warnings, transmission slipping after fluid loss

Fix: Steel cooler lines rust through where they pass along the frame and connect to the radiator. Requires replacement of lines from transmission to radiator (2-3 hours). Often discovered too late after transmission damage from running low on fluid. Replace both lines as preventive maintenance.

Estimated cost: $250-450

Symptoms: visible rust perforation behind rear wheels, sagging body at door gaps, cracking body mounts, doors not closing properly, floor pan rust-through

Fix: B-body frames rust at rear body mounts and floor support sections in salt states. Body mounts deteriorate and crack. Proper fix requires body-off restoration with frame sandblasting, welding, and new mounts (40+ hours). Most aren't worth fixing once rust is severe.

Estimated cost: $4,000-8,000

Typical onset: varies - more age-related than mileage

Symptoms: rough idle, stalling when warm, black smoke from exhaust, poor fuel economy, hesitation on acceleration

Fix: Rochester Quadrajet carburetors develop vacuum leaks, worn throttle shafts, and stuck choke mechanisms after sitting or from old gaskets. Rebuild takes 3-4 hours including removal and adjustment. Modern ethanol fuel accelerates deterioration of internal rubber parts.

Estimated cost: $350-650

Typical onset: 100,000-150,000 mi

Symptoms: oil spots on driveway centered under engine, oil accumulation on transmission bellhousing, oil dripping from rear of engine, low oil level between changes

Fix: Two-piece rear main seal design eventually seeps or leaks. Requires transmission removal to access (8-10 hours labor). Many owners live with minor seepage unless it becomes excessive. Upgrade to one-piece seal during repair if available for your specific engine.

Estimated cost: $600-1,200

Typical onset: any - often age-related

Symptoms: no cold air, compressor clutch not engaging, loud squealing or grinding from compressor, compressor pulley wobble

Fix: Original R12 systems with A6 compressors fail from internal wear and seizure. System requires R12 to R134a conversion, compressor replacement, dryer replacement, and full evacuation/recharge (4-6 hours). Many cars have non-functional AC at this age.

Estimated cost: $800-1,400