Several factors contribute to this:
* Transmission Fluid Viscosity: Cold transmission fluid is thicker, making it harder for the transmission to shift smoothly. As the fluid warms, it thins and allows for smoother operation. This is a normal characteristic of most automatic transmission fluids.
* Torque Converter Clutch Engagement: The torque converter clutch might engage later when cold to minimize stress on the transmission until warmed up. This can cause a noticeable difference in shifting feel.
* Transmission Control Module (TCM) Programming: The TCM may adjust shift points and strategies based on engine temperature. Older programming might be more pronounced in this behavior.
* Worn Components: While less likely to be the sole cause of cold-only shifting issues, worn internal components in the transmission *can* exacerbate the problem. If the shifting issues persist even when warm, this is a significant concern.
If your 1998 Chrysler transmission only operates poorly when cold:
* Check your transmission fluid level and condition: Low or dirty fluid significantly impacts performance. Have it checked and changed (including filter) if needed. The fluid type should be what's specified in your owner's manual.
* Consider a transmission fluid additive: Some additives claim to improve cold-weather performance, but use with caution and follow instructions carefully.
* Consult a mechanic: If the problem persists after fluid changes, a mechanic can diagnose any potential underlying mechanical issues within the transmission. They'll be able to properly test for worn components, solenoid issues, or other internal problems.
In short, it's not unusual for a 1998 Chrysler's transmission to shift a bit rougher when cold, but prolonged or severe issues warrant professional attention to prevent more extensive damage.
