1991 DODGE RAM VAN

Typical onset: 80,000-150,000 mi

Symptoms: Pink or milky fluid in transmission pan (coolant mixing with ATF), Transmission slipping, delayed engagement, or total failure, Engine overheating and transmission problems appearing together

Fix: The internal transmission cooler in the radiator fails, allowing coolant and ATF to cross-contaminate. If caught early, flush both systems, replace radiator, and add external cooler (2-4 hours labor). If contamination destroys transmission, add rebuild or replacement (8-12 hours total labor).

Estimated cost: $400-800 for early catch; $1,800-3,200 with transmission rebuild

Typical onset: 120,000-180,000 mi

Symptoms: White smoke from exhaust, coolant loss with no external leaks, Oil contamination with coolant (milky dipstick), Knocking or rod noise after overheat event, Loss of compression in one or more cylinders

Fix: Overheating (often radiator or cooling fan related) warps heads or blows gaskets. Head gasket job on V8 is 10-14 hours. If bearings are damaged from coolant dilution or sustained overheat, main and rod bearings fail, requiring short block or full rebuild (20-30 hours labor).

Estimated cost: $1,200-2,000 head gaskets only; $3,500-5,500 for short block or rebuild

Typical onset: 100,000+ mi

Symptoms: Hard starting when fuel tank below half, Sputtering or dying under load, especially uphill or highway merging, No-start after sitting; fuel pump hums but no pressure

Fix: In-tank pump pickup socks clog with rust and varnish from aged steel tanks. Filter replacement (0.5 hour) often a temporary fix. Pump replacement requires tank drop (3-4 hours labor). Consider tank cleaning or replacement if heavily contaminated.

Estimated cost: $400-700 including pump and labor; add $300-600 if tank needs replacement

Typical onset: 70,000-120,000 mi

Symptoms: Clunking on acceleration or deceleration, Excessive vibration through floor, especially in reverse, Visible sagging or torn rubber on crossmember mount

Fix: Rear transmission mount deteriorates from heat and load. Replacement is straightforward: support trans with jack, remove crossmember bolts, swap mount (1.5-2 hours). Often done with exhaust work since access overlaps.

Estimated cost: $150-300

Typical onset: 60,000+ mi

Symptoms: Rough or hunting idle, especially when warm, Stalling at stops after highway driving, High idle on cold start that won't drop

Fix: Carbon buildup causes IAC valve to stick. Clean throttle body and IAC passages with carb cleaner (0.5-1 hour). If valve is seized, replacement needed (1 hour). Test with scan tool to confirm IAC duty cycle before replacing.

Estimated cost: $80-150 cleaning; $200-350 with IAC replacement

Typical onset: 80,000-140,000 mi

Symptoms: Clunking over bumps, especially when turning, Wandering or loose steering feel, Uneven tire wear on inside or outside edges

Fix: Lower ball joints wear faster due to van weight and solid axle design. Requires press or ball joint service kit. Both sides recommended simultaneously (3-4 hours labor). Alignment mandatory after replacement.

Estimated cost: $400-700 both sides with alignment

Symptoms: Dimming lights or gauge cluster at idle, Battery warning light intermittent or steady, No-start with jump-start working temporarily, Squealing from alternator bearing

Fix: Alternators mounted low near exhaust fail from heat cycling. Brushes wear, diodes short, or bearings seize. Replacement is 1-1.5 hours on V6, slightly longer on V8 with AC and tight engine bay. Test output before condemning; voltage regulator in PCM on some models.

Estimated cost: $250-450 with reman unit