Lot 8339: 1988 Chrysler New Yorker

Based on my research, here are the most common transmission problems with the 1988 Chrysler New Yorker:

Primary Issues with the A604/Ultradrive Transmission:

1. Limp Mode Problems - The most frequent issue where the transmission suddenly locks into 2nd gear (called “limp-home” mode). This happens when the transmission computer detects sensor problems and defaults to a safe mode to prevent damage.

2. Poor Shifting Quality - Rough, harsh, or erratic shifting between gears, often caused by:

   • Faulty input/output speed sensors
   • Solenoid pack failures
   • Low or contaminated transmission fluid

3. Transmission Slipping - Engine RPM increases but the car doesn’t accelerate proportionally, indicating:

   • Worn clutch plates
   • Low hydraulic pressure
   • Internal mechanical wear

4. Sensor Failures - The A604 relies heavily on electronic sensors that commonly fail:

   • Throttle position sensor
   • Vehicle speed sensor
   • Transmission temperature sensor

5. Fluid-Related Issues - These transmissions are very sensitive to fluid quality and level:

   • Requires specific ATF+3 or ATF+4 fluid
   • Contaminated or burnt fluid causes shifting problems
   • Overheating due to inadequate cooling

6. Solenoid Pack Problems - The solenoid pack controls gear shifts and commonly fails, causing harsh shifting or failure to shift properly.

Prevention Tips:

• Regular fluid changes with the correct ATF+3/+4 fluid
• Address any sensor issues immediately
• Keep the transmission cool with proper maintenance of the cooling system
• Have the transmission computer scanned for codes if any shifting issues appear

The good news is that many of these issues are well-documented and repairable, though the A604 transmission does require attentive maintenance to keep it running reliably.