1982 CHEVROLET C30

Typical onset: 80,000-150,000 mi

Symptoms: slipping between gears under load, delayed engagement into drive, burnt transmission fluid smell, harsh 2-3 shift

Fix: The TH400 behind the big-blocks gets cooked from towing without auxiliary cooling or broken factory cooler lines. Transmission mounts fail first (causing driveline vibration), then the cooler clogs, then you're rebuilding the trans. Proper rebuild takes 12-15 hours including R&R, converter, and all hard parts. Add an external cooler during the job or you'll be back in a year.

Estimated cost: $2,200-3,800

Typical onset: 120,000-180,000 mi

Symptoms: blue smoke on startup, excessive blowby from breather, oil consumption over 1 qt per 500 miles, low oil pressure at idle when hot

Fix: These engines were routinely overloaded hauling goosenecks and dumps. Piston rings wear out, cylinder walls score, and main bearings go next. You'll need a full rebuild or short block swap—25-30 hours labor for proper engine R&R and rebuild with machine work. Most shops recommend going straight to a reman long block to save downtime.

Estimated cost: $4,500-7,500

Typical onset: 90,000-140,000 mi

Symptoms: hard starting when warm, black smoke under acceleration, loss of power above half throttle, engine dies and won't restart until cool

Fix: The Stanadyne DB2 injection pump fails from fuel contamination and internal wear. Pump itself is 8-10 hours to replace properly with timing set and lines bled. You MUST replace both fuel filters and check the tank for rust and water or the new pump dies in 20k miles. Most failures trace back to poor fuel filtration maintenance.

Estimated cost: $1,800-2,800

Typical onset: 100,000-160,000 mi

Symptoms: heavy knocking from bottom end that increases with RPM, metallic debris in oil, sudden loss of oil pressure, catastrophic failure if ignored

Fix: The 454s were bulletproof unless starved for oil or run low. When rod bearings let go, it's either a complete rebuild or short block replacement—same 25-30 hour job as the small blocks. If you catch it early with just a knock, you might get away with bearing replacement in-chassis (18-20 hours), but most guys pull it for peace of mind.

Estimated cost: $3,800-6,500

Typical onset: 70,000-120,000 mi

Symptoms: clunking from front end when engaging 4WD, gear oil leak at pinion seal or axle tubes, grinding noise during turns in 4WD, vibration at highway speed

Fix: The Dana 60 front is stout but the pinion bearings wear from abuse and the seals leak from age. Minor seal jobs are 3-4 hours, but if you've got bearing noise you're looking at a full rebuild—12-16 hours including setup and backlash. Most 4x4 C30s need this once if they actually used the front axle for work.

Estimated cost: $800-2,200

Symptoms: gas smell after sitting, stumbling on acceleration, black smoke from tailpipe, hard starting when hot, fuel leaking from carb base

Fix: The Rochester Quadrajet carbs leak from cracked gaskets, stuck floats, and worn needle/seats. Most trucks sit too much between work cycles and gas varnishes everything. A proper rebuild kit and 4-6 hours gets it right, but half the trucks out there are running on someone's third attempt with the wrong jets. Don't bandaid it—rebuild or replace with a new Edelbrock.

Estimated cost: $400-900

Symptoms: cab shifting on frame over bumps, visible rust holes in frame rails behind cab, bed mounting bolts broken or rusted through, creaking sounds from body-frame junction

Fix: Every C30 from the snowbelt has frame rust behind the cab and rotted body mounts. The frame can be plated and welded (10-15 hours fabrication), but most guys just run them until they're unsafe. Body mounts are 6-8 hours if you don't break bolts—you will break bolts. Inspect carefully before buying because this determines if the truck is worth saving.

Estimated cost: $800-2,500