1968 CHEVROLET C10

Typical onset: 80,000-150,000 mi

Symptoms: Oil pressure gauge reading below 10 psi at idle when hot, Knocking or rumbling from crankcase, especially on cold start, Metal shavings in oil pan during drain

Fix: Requires full engine teardown to inspect crank journals, replace main and rod bearings, check bearing clearances. Often reveals worn cam bearings and ridge-reamed cylinders needing machining. 16-24 labor hours depending on accessibility and machine shop turnaround.

Estimated cost: $2,200-4,500

Symptoms: Clunking when shifting from park to drive or reverse, Excessive driveline vibration at highway speeds, Visible sag or tearing of rubber mount when inspected from underneath

Fix: Mount replacement requires supporting transmission with jack, removing crossmember bolts, swapping rubber isolator. Original mounts dry-rot even on low-mileage trucks. 1.5-2.5 hours labor.

Estimated cost: $150-350

Typical onset: 100,000-200,000 mi

Symptoms: Blue smoke on startup or deceleration, Burning 1+ quart of oil every 500-800 miles, Poor compression test results with wet test showing improvement

Fix: Proper fix is cylinder honing or boring, new rings, possibly pistons if skirt wear is present. Many shops do a full short-block overhaul at this point given age and labor overlap. 18-28 hours for full teardown and machine work.

Estimated cost: $3,500-6,500

Symptoms: Visible rust perforation in frame rails behind front wheels or ahead of rear axle, Crumbling or missing rubber cab mount bushings, Cab sitting crooked or doors not closing properly, Floor pans rusted through in footwells

Fix: Cab mount replacement requires lifting cab off frame with hoist, replacing all bushings and retorquing. Frame rust requires sandblasting, welding in patch panels or replacing sections—sometimes not economically viable. Cab mount job alone: 8-12 hours; frame repair varies wildly.

Estimated cost: $800-1,500 (mounts only); $3,000-10,000+ (frame work)

Typical onset: 60,000-120,000 mi

Symptoms: Excessive play at steering wheel—more than 2 inches free movement before wheels respond, Wandering on highway requiring constant correction, Clunking when turning lock-to-lock

Fix: Steering box can often be adjusted via sector shaft screw to reduce slop, but worn boxes need rebuild or replacement. Tie rod ends and idler arm bushings also wear and must be replaced as set. Alignment required after. 3-5 hours total.

Estimated cost: $400-900

Symptoms: Complete brake pedal loss if any hydraulic line fails, Leaking wheel cylinders or corroded hard lines, Spongy pedal that doesn't firm up after bleeding

Fix: 1968 got dual-circuit master cylinder federally, but many trucks still run old single-bowl units or corroded original lines. Replace master cylinder, all four wheel cylinders, flush lines, bleed system. Consider full hard-line replacement kit if rust present. 6-10 hours.

Estimated cost: $600-1,200

Symptoms: Hard starting after sitting more than a week, Stumbling, hesitation, or stalling at idle, Fuel smell from deteriorated rubber fuel lines

Fix: Original carburetors (Rochester or Holley) and fuel pumps not designed for modern ethanol fuel. Requires carburetor rebuild, fuel line replacement with ethanol-compatible hose, new fuel filter, possibly tank cleaning. 4-6 hours.

Estimated cost: $350-750