1965 CHEVROLET C10

Typical onset: 80,000-150,000 mi

Symptoms: Excessive blowby and oil consumption beyond 1 qt per 500 miles, Low compression across multiple cylinders (under 100 psi), Blue smoke on startup and acceleration, Knocking or rumbling from bottom end under load

Fix: In-frame rebuild with piston rings, main and rod bearings, timing components. I6 engines: 18-24 hrs labor. Small-block V8s: 20-28 hrs. Most of these trucks have original or single-rebuild engines by now. Machine work (bore/hone) adds cost if cylinders are scored.

Estimated cost: $2,800-5,500

Symptoms: Clunking when shifting from park to drive or reverse to drive, Excessive driveline vibration at idle in gear, Visible cracking or complete separation of rubber from metal bracket, Transmission tail drooping noticeably

Fix: Replace crossmember-mounted transmission mount. Original rubber mounts harden and crack after decades. Job is straightforward: support transmission, unbolt crossmember, swap mount. 1-1.5 hrs labor. Polyurethane upgrades available for $20 more.

Estimated cost: $120-220

Symptoms: Hard starting after sitting more than a week, Fuel leaks at pump, lines, or tank seams, Rough idle and stumbling under acceleration, Varnish buildup in carburetor bowls, Rust particles in fuel filter (tank liner failure)

Fix: Modern ethanol fuel eats original rubber lines, cork gaskets, and tank coatings. Typical fix: replace steel fuel lines (they rust from inside out), install inline filter before pump, rebuild or replace mechanical fuel pump, possibly tank sealer or replacement. Expect 4-8 hrs depending on extent. Carb rebuild often needed simultaneously (add 2-3 hrs).

Estimated cost: $450-1,200

Typical onset: 100,000+ mi

Symptoms: Grinding when shifting into second gear even with clutch fully depressed, Difficult engagement into first from stop, Popping out of second under deceleration

Fix: SM420 and Muncie 3-speeds are tough but second gear synchro wears first from constant stop-and-go use. Rebuild requires transmission removal (4-6 hrs), disassembly, synchro ring and slider replacement. Parts are still available. Many owners just double-clutch and live with it.

Estimated cost: $800-1,400

Typical onset: 60,000+ mi

Symptoms: Excessive play at steering wheel (more than 2 inches free movement), Constant correction needed to maintain straight line, Clunking from steering box over bumps, Weeping gear oil from box seals

Fix: Recirculating ball steering boxes wear internally and lose preload adjustment range. First attempt sector shaft adjustment (free, 15 minutes). If no improvement, box rebuild or replacement needed: 3-4 hrs labor including alignment. Aftermarket boxes (Borgeson, AGR) offer tighter tolerances. Inspect tie rod ends and idler arm simultaneously—they mask box wear.

Estimated cost: $350-750

Typical onset: 70,000-120,000 mi

Symptoms: Severe shimmy or death wobble at 35-50 mph, Grinding or clicking during turns, Excessive vertical play in front wheels when jacked up, Uneven tire wear on inside edges

Fix: 4WD Dana 44 front axles use kingpins instead of ball joints. Pins wear along with bronze bushings and thrust bearings. Requires knuckle disassembly, reaming bushings, installing oversize pins. 8-12 hrs per side if corroded. Critical safety item—worn pins can separate. Many shops won't touch this job; specialist knowledge required.

Estimated cost: $1,200-2,400

Symptoms: Running hot in traffic or under load despite new thermostat, Brown sludge in radiator when cap removed, Heater produces weak or no heat, Visible external corrosion on brass radiator tanks

Fix: Original copper/brass radiators corrode internally after 60 years; engine blocks accumulate rust scale restricting coolant flow. Radiator recore or replacement (aluminum upgrade recommended): 2-3 hrs. Engine block flushing with acidic cleaner adds 2-4 hrs if severe. Water pump replacement often necessary simultaneously. Use proper coolant—plain water accelerated this damage.

Estimated cost: $500-1,100