1972 PONTIAC CATALINA

Typical onset: 90,000-140,000 mi

Symptoms: Slipping between 1st and 2nd gear, especially when cold, Delayed engagement into drive or reverse, Burnt transmission fluid smell and dark red/brown fluid, Hard 2-3 shift or no 3rd gear at all

Fix: TH400 rebuild with new clutches, bands, seals, and torque converter. Expect 12-16 hours labor for removal, rebuild, and reinstall. These units tolerate abuse but once clutches start slipping, it cascades fast. Always replace the transmission mount and inspect the cooler lines while it's out.

Estimated cost: $1,800-3,200

Symptoms: Rough idle, stalling at stop lights, Hesitation on acceleration, black smoke from exhaust, Hard starting when hot, Poor fuel economy even for a big-block (under 8 mpg city)

Fix: The Rochester 2-barrel or Quadrajet 4-barrel carbs are 50+ years old now. Rubber components in the carb, fuel pump, and EGR system harden and crack. Full carburetor rebuild kit plus EGR valve and vacuum line replacement typically takes 4-6 hours if you're thorough. Many owners delete emission equipment, but carb tuning is critical either way.

Estimated cost: $600-1,200

Typical onset: 120,000-180,000 mi

Symptoms: Knocking or ticking from bottom end, especially on cold start, Low oil pressure at idle (under 10 psi hot), Blue smoke on deceleration or startup, Excessive blowby visible at oil filler cap

Fix: Pontiac V8s are durable, but neglected oil changes kill main and rod bearings. If you're into it for bearings, you're looking at 18-24 hours for engine removal, disassembly, machining, and reassembly. At this point, most owners opt for full rebuild with pistons, rings, and machine work. Short block replacement is faster but good cores are scarce.

Estimated cost: $3,500-6,500

Symptoms: Fuel smell inside cabin or around tank area, Difficulty starting after sitting, requires cranking and pumping, Rough running that improves after a few minutes, Visible rust or debris in fuel filter

Fix: Original steel fuel lines rust from inside out, especially if the car sat with ethanol fuel. Rubber hoses at the tank and pump are cracked and leaking. Plan on 6-10 hours to replace fuel sending unit, tank straps, lines from tank to pump, pump to carb, and all rubber connectors. Tank may need cleaning or replacement if rusty inside.

Estimated cost: $800-1,500

Symptoms: Visible surface rust or scale on frame rails, Sagging or misaligned body, doors don't close evenly, Cracking paint along rocker panels and wheel wells, Control arm or sway bar mounts show movement or tearing

Fix: B-body frames rust at the rear leaf spring mounts and front subframe where water collects. Structural rust is expensive and dangerous—welding and plating frame sections requires 20+ hours and frame-straightening equipment. Surface rust can be wire-wheeled and treated, but if you see holes or flaking metal, walk away unless you have fabrication skills.

Estimated cost: $2,500-5,000

Typical onset: 60,000-100,000 mi

Symptoms: Power steering fluid puddles under front of car, Whining noise when turning at low speeds, Stiff steering or wandering on highway, Low fluid level repeatedly despite top-offs

Fix: Saginaw pumps and gear boxes leak from old seals. Pump rebuild takes 2-3 hours, gear box seal replacement 3-4 hours. If the gear box itself is worn (loose steering with slop in the wheel), you're looking at replacement, which is 4-5 hours. Check all hoses—these get brittle and blow out under pressure.

Estimated cost: $400-900