1964 CHEVROLET BISCAYNE

Typical onset: Original units often fail at 80,000-150,000 mi, but most survivors have unknown history

Symptoms: Slipping between gears, especially 1st to 2nd in Powerglide, Delayed engagement when shifting into Drive or Reverse, Burnt transmission fluid smell, dark or metallic fluid, Complete loss of forward gears

Fix: Full rebuild required — Powerglide is simpler (8-10 hours labor), TH400 swap common alternative. Includes clutch packs, bands, seals, and filter. Budget 12-16 hours if case damage present.

Estimated cost: $1,800-3,200

Typical onset: 100,000+ mi on original engines, earlier if neglected oil changes

Symptoms: Deep knocking sound at idle, worsens with RPM, Low oil pressure at operating temperature (under 10 psi hot idle), Metallic debris in oil pan during changes, Crank walk or excessive runout measured at balancer

Fix: Engine-out rebuild with crank grinding or replacement, new bearings, honing, and ring/piston work if cylinders worn. Minimum 24-30 hours labor for small-block V8, more for 348/409. Often discover cam wear once inside.

Estimated cost: $3,500-6,500

Symptoms: Hard starting when cold, floods when hot, Erratic idle, hesitation on acceleration, Fuel weeping from carb base or bowl gaskets, Modern ethanol fuel degrades old rubber lines — see rust flakes in filter

Fix: Rochester or Carter carb rebuild kits run 3-5 hours with proper bench setup. Replace all fuel lines, filter, and mechanical pump diaphragm. Expect to re-jet for modern fuel. If carb body warped, replacement $300-600.

Estimated cost: $450-950

Typical onset: Rubber mounts degrade every 15-20 years regardless of miles

Symptoms: Clunk when shifting from Park to Drive, Excessive driveline vibration at highway speed, Visible sag in transmission tail housing, Exhaust contact or shifter linkage binding

Fix: Straightforward replacement but requires trans support and crossmember removal. 2-3 hours labor. Check for rust-through on crossmember itself — common in salt states, requires welding or replacement fabrication.

Estimated cost: $250-600

Symptoms: Coolant seepage from side of block (freeze plug rust-through), Radiator core leaks, tanks separated from core tubes, Overheating in traffic despite new thermostat and water pump, Oily coolant or milky oil if head gasket fails from overheating

Fix: Radiator recore or replacement 3-4 hours. Freeze plug replacement requires engine mounts loosened to shift block, access rear plugs — 6-10 hours depending on how many fail. Always replace all if doing rears.

Estimated cost: $800-2,200

Typical onset: Original rope seals harden and leak after 50+ years

Symptoms: Oil drips from bell housing inspection cover, Oily clutch if manual transmission (causes slip), Large oil spots after parking overnight, Automatic trans fluid contamination if leak severe

Fix: Transmission-out job, 8-12 hours labor. Rope seal replacement requires proper installation technique — many shops prefer modern neoprene conversion seal. Inspect flywheel/flexplate surface and pilot bushing while apart.

Estimated cost: $900-1,600

Typical onset: 80,000+ mi, accelerated by poor lube or manual steering on heavy car

Symptoms: Excessive play at wheel (more than 2 inches free movement), Wandering on highway, constant correction needed, Clunking over bumps from loose sector shaft, Gear oil leaking from box seals

Fix: Adjustment first (1 hour), but worn boxes need rebuild or replacement. Manual Saginaw box rebuild 4-6 hours, power steering box 6-8 hours. Check pittman arm and idler arm wear simultaneously.

Estimated cost: $400-1,200