1976 CHEVROLET BLAZER

Typical onset: 80,000-140,000 mi

Symptoms: Slipping between gears, especially 1st-2nd or 2nd-3rd, Delayed engagement when shifting into drive or reverse, Red fluid in the radiator or milky transmission fluid (cooler leak), Whining or grinding noise under load

Fix: Full rebuild with hard parts, new clutches, bands, seals, and torque converter. Expect 12-16 hours labor. If the transmission oil cooler in the radiator failed, you'll need a radiator too and a complete fluid flush before rebuild.

Estimated cost: $1,800-3,200

Symptoms: Rough idle, stalling at stop signs, Black smoke from exhaust, poor fuel economy, Hesitation or stumble on acceleration, Hard starting when cold or hot

Fix: These Q-jets gum up from ethanol fuel and sitting. Full rebuild kit with new gaskets, accelerator pump, needle/seat, and float adjustment takes 3-5 hours if you know what you're doing. Many shops just swap in a remanufactured unit.

Estimated cost: $400-900

Typical onset: 120,000-180,000 mi

Symptoms: Low oil pressure at idle (under 10 psi hot), Blue smoke on startup or under load, Excessive blowby, oil in air cleaner, Knocking or rod tap at idle

Fix: Piston rings, bearings, and cylinder wear are common after 150k. Short block replacement (block, pistons, crank, cam) runs 18-24 hours. Long block (includes heads) is 20-28 hours. Many owners just swap in a crate motor instead of rebuilding the smog-era low-compression original.

Estimated cost: $3,500-6,500

Symptoms: Visible rust perforation on frame rails behind cab, Sagging body or cab misalignment, Cracked or crumbling rubber body mounts, Rust bubbles at rear wheel arches and rocker panels

Fix: Salt-belt trucks often have frame rot at the rear spring hangers and cab mounts. Body mount replacement (all 6-8 mounts) is 4-6 hours. Frame section repair or plating requires welding and can run 10-20 hours depending on severity. This is a walk-away issue if severe.

Estimated cost: $600-4,000

Symptoms: Stalling after driving 20-30 minutes in hot weather, Hard restart when engine is hot, Fuel smell in cab, leaks at rubber hoses near engine, Rough running after sitting for weeks

Fix: Rubber fuel lines from tank to pump and pump to carb harden and crack. Mechanical fuel pump diaphragms fail. Ethanol fuel leaves varnish in the carb and tank. Replace all rubber lines, pump, and filter; clean tank if it sat. Takes 2-4 hours.

Estimated cost: $300-700

Typical onset: 60,000-120,000 mi

Symptoms: Gear oil dripping from front or rear output seals, Low fluid causes whining or grinding in 4WD, Oil spots on driveway after sitting overnight

Fix: Front and rear output seals are common leak points. Seal replacement is 2-3 hours per seal (requires driveshaft removal). If the case is run low on fluid, the planetary gears and chain wear prematurely and you're looking at a rebuild (8-12 hours).

Estimated cost: $250-500