1981 CHEVROLET CAPRICE

Typical onset: 60,000-90,000 mi

Symptoms: Slipping on 1-2 or 2-3 shift under load, No reverse or delayed engagement, Metal shavings in pan during fluid changes, Transmission overheating on highway drives

Fix: The TH200 metric transmission behind the 267 V8 was severely underbuilt for this car's weight. Rebuild requires 8-12 hours, but most techs recommend swapping to a TH350 instead (12-16 hours with driveshaft modification and crossmember work). Core TH200 rebuilds rarely last another 50K miles.

Estimated cost: $1,800-3,200

Typical onset: 80,000-120,000 mi

Symptoms: Rough idle and stalling when warm, Check Engine light with codes 33 or 34 (MAP sensor), Hesitation off idle, stumbling on acceleration, Poor fuel economy below 10 mpg city

Fix: The Rochester E4ME carb and its maze of vacuum hoses, solenoids, and early O2 sensor feedback create constant tuning headaches. Typical fix involves carburetor rebuild (4-6 hours), new MAP sensor, O2 sensor replacement, and vacuum line renewal. Many owners convert to HEI distributor upgrades and bypass CCC entirely for reliability.

Estimated cost: $800-1,600

Typical onset: 70,000-110,000 mi

Symptoms: White smoke from exhaust constantly, Coolant in oil (milky dipstick), Loss of coolant with no external leaks, Loss of compression in multiple cylinders, Hard starting when cold

Fix: The 5.7L Oldsmobile diesel used weak head bolts and inadequate block casting. Head gasket jobs require 18-24 hours and often reveal cracked heads or block. Most shops quote engine replacement with a used gas V8 instead of diesel rebuild because parts availability is nil and failure repeats. Complete diesel-to-gas swap runs 24-32 hours.

Estimated cost: $3,500-6,500

Typical onset: 90,000-140,000 mi

Symptoms: Loud clunk when shifting from Park to Drive or Reverse, Visible tailshaft drop when engine is running, Vibration at highway speeds around 55-65 mph, Exhaust contact or scraping under acceleration

Fix: The rubber transmission mount deteriorates and the stamped steel crossmember cracks near the body mounts, especially on cars driven in salt states. Requires transmission support, crossmember removal, and mount replacement (2-3 hours). Inspect exhaust and driveshaft for damage from dropped transmission angle.

Estimated cost: $250-500

Typical onset: 100,000+ mi

Symptoms: Oil puddle under rear of engine after sitting overnight, Oil coating on bellhousing and transmission case, Blue smoke on startup after long park, Losing 1+ quart between oil changes

Fix: The two-piece rear main seal and cork oil pan gasket are common leak points on these small-block Chevys. Rear main seal requires transmission removal (8-10 hours on the car), oil pan is 3-4 hours. Many owners live with slow drips and keep oil topped off rather than invest in the labor.

Estimated cost: $600-1,400

Typical onset: 80,000-130,000 mi

Symptoms: Groaning or whining when turning at low speed, Fluid on inner fender and frame rail, Heavy steering effort when cold, Puddles of red ATF under front end

Fix: The Saginaw recirculating-ball steering box develops sector shaft seal leaks, and pump output shaft seals fail. Box rebuild or replacement runs 4-6 hours with alignment; pump swap is 2 hours. Pressure hose failures are also common and should be replaced preventively during pump work.

Estimated cost: $450-900

Symptoms: Visible rust perforation on frame behind front wheels, Body sagging or misalignment at doors, Crunching sound over bumps near body mounts, Failed state safety inspection

Fix: Cars from salt states suffer severe frame rust in the front crossmember and rear spring mounts. Body mounts are also prone to complete disintegration. Frame repair requires sandblasting, welding in new sections, and body removal for access (40+ hours). Most shops total the car rather than attempt frame work unless it's exceptionally clean elsewhere.

Estimated cost: $5,000+