1996 GMC JIMMY

Typical onset: 100,000-150,000 mi

Symptoms: Pink fluid under vehicle or dripping from transmission cooler lines, Transmission slipping, delayed engagement, or no movement, Burnt transmission fluid smell, Metal shavings in transmission pan

Fix: The steel cooler lines rust through where they pass over the frame, contaminating the transmission with coolant. Once mixed, the transmission is toast. Prevention requires replacing lines proactively (~2 hrs). Full transmission rebuild or replacement if contamination occurs (8-12 hrs labor).

Estimated cost: $400-800 for lines only; $1,800-3,200 for transmission rebuild/replacement

Typical onset: 80,000-140,000 mi

Symptoms: Coolant loss with no visible external leak, White smoke from exhaust on cold start, Rough idle or misfire codes, Oil contamination with coolant (milky dipstick)

Fix: The plastic intake manifold gaskets deteriorate and allow coolant into the crankcase or cylinders. Requires complete upper engine disassembly, gasket replacement, and often spider injector service while you're in there. 6-8 hrs labor.

Estimated cost: $800-1,400

Typical onset: 60,000-100,000 mi

Symptoms: Clunking or popping from front suspension over bumps, Loose or wandering steering, Excessive tire wear on inside edge, Visible play when prying on tire at 12 and 6 o'clock

Fix: The press-in upper ball joints wear out and can separate catastrophically. GM issued recalls but many weren't addressed. Requires pressing out old joints and installing new ones, plus alignment. 3-4 hrs per side.

Estimated cost: $400-700 per side

Typical onset: 120,000-180,000 mi

Symptoms: No start or intermittent stalling, Loss of power under acceleration, Whining noise from fuel tank, Hard starting when fuel tank is below 1/4

Fix: In-tank fuel pump fails, often due to running on low fuel repeatedly. Requires dropping the fuel tank, which is straightforward on this platform. 2-3 hrs labor.

Estimated cost: $400-650

Typical onset: 100,000-150,000 mi

Symptoms: Random misfires or rough running, Stalling when hot, Check engine light with multiple misfire codes, Poor fuel economy

Fix: The distributor cap, rotor, and ignition module degrade. The optical pickup sensor in the distributor fails intermittently when hot. Full distributor replacement is often most reliable. 1.5-2 hrs labor.

Estimated cost: $250-500

Symptoms: SERVICE 4WD light illuminated, Cannot shift into or out of 4WD, Grinding noise when attempting 4WD engagement, Blinking transfer case indicator lights

Fix: The encoder motor on the NP233 transfer case fails, preventing engagement or causing it to stay engaged. Motor replacement is straightforward once you're under the vehicle. 1.5-2 hrs labor.

Estimated cost: $300-500

Typical onset: 80,000-120,000 mi

Symptoms: Gear oil dripping from front of rear differential, Low differential fluid discovered during service, Whining noise from rear end if run low on fluid

Fix: Pinion seal hardens and leaks. Requires removing driveshaft, pulling pinion flange, and replacing seal with proper preload setup. 2-3 hrs labor.

Estimated cost: $250-450