1977 BUICK REGAL

Typical onset: 60,000-90,000 mi

Symptoms: Slipping between 1st and 2nd gear under light throttle, Delayed engagement into Drive or Reverse, Burnt transmission fluid smell and dark/gritty fluid, Complete loss of forward gears, reverse only works

Fix: TH200 was GM's budget lightweight transmission and notoriously fragile behind even the 231 V6. Rebuild requires 8-12 hours including R&R, new clutch packs, bands, and seals. Many shops recommend upgrading to TH350 swap instead (adds 4-6 hours for linkage and crossmember mods). If staying TH200, add external cooler to extend life.

Estimated cost: $1,400-2,200

Typical onset: 70,000-110,000 mi

Symptoms: Coolant loss with no visible external leaks, White smoke from tailpipe on cold startup, Rough idle and misfires when warm, Milky oil on dipstick (severe cases)

Fix: The composite intake gaskets on the odd-fire 231 V6 deteriorate and allow coolant into the valley. Requires intake removal, gasket set, and cleaning—5-7 hours labor. Often find corroded lifter valley; budget for valley pan reseal. While in there, replace distributor o-ring and thermostat housing gaskets which also leak on these engines.

Estimated cost: $650-1,100

Symptoms: Engine floods and stalls when hot, long restart crank time, Black smoke and fuel smell at idle, Fuel dripping from carb base or air cleaner, Erratic idle speed, hunting between 500-1200 RPM

Fix: The Rochester 2-barrel carbs are heat-soaked nightmares with modern ethanol fuel. Needle-and-seat wear plus deteriorated float causes flooding. Proper fix is full rebuild kit with brass float replacement—3-4 hours including adjustment and tune. Keep phenolic spacer under carb to reduce heat soak. Some owners switch to Edelbrock 1406 for reliability.

Estimated cost: $350-600

Symptoms: Clunking over bumps from rear of car, Body visibly sagging relative to rear axle on one side, Visible rust perforation behind rear wheel wells, Trunk floor soft or cracked around frame connection points

Fix: Rust-belt cars suffer badly—rear frame rails trap mud and salt, rusting from inside out. Body mounts disintegrate allowing body to shift on frame. Inspection requires getting under car; surface rust hides structural failure. Proper fix requires frame section welding (12-20 hours) or frame-off repair. Body mounts alone are 4-6 hours with new bushings. Not a DIY job without welding skills and lift.

Estimated cost: $1,800-4,500

Typical onset: 80,000-120,000 mi

Symptoms: Brake pedal slowly sinks to floor when held at stops, Brake fluid reservoir constantly low despite no visible wheel cylinder leaks, Spongy pedal that doesn't firm up after bleeding, Fluid visible on booster or inside driver's side frame rail

Fix: Single-reservoir master cylinders and combination valve assemblies leak internally as seals age. Master cylinder rebuild or replacement is 2-3 hours. Proportioning valve doesn't rebuild—replacement only, adds 1-2 hours and requires complete brake system bleed. If converting to dual-reservoir modern master, budget 4-5 hours for bracket fab and line modifications.

Estimated cost: $400-850

Typical onset: 90,000+ mi

Symptoms: Ticking or tapping sound from engine bay that increases with RPM, Exhaust smell in cabin with heater on, Visible soot streaks on manifold surface, Failed emissions test due to pre-cat leak (California cars)

Fix: Cast iron manifolds crack from thermal cycling, especially V8 passenger side. Broken studs are common—heads drilled for 3/8" but cast manifolds stress the threads. Manifold replacement is 3-5 hours per side including stud extraction (always at least 2-3 broken). Use hardened studs and high-temp anti-seize on reinstall. Headers are alternative but clearance tight on A-body.

Estimated cost: $450-900