* Low or No Transmission Fluid: This is the first and easiest thing to check. Check the transmission fluid level with the engine running and warmed up. If it's low or nonexistent, you'll need to add fluid (the correct type for your transmission!), but this might only be a temporary fix if there's a leak. Low fluid can cause catastrophic damage.
* Fluid Problems: Even if the level is okay, the fluid itself could be the issue. Old, dirty, or burned transmission fluid can cause the transmission to malfunction. A complete fluid and filter change might be necessary.
* Broken Linkage or Cable: The linkage or cable connects the shifter to the transmission. A broken or disconnected component prevents the transmission from receiving the shifting commands. Inspect the linkage for any obvious damage or disconnections.
* Internal Transmission Problems: This is the most likely cause if fluid levels are okay and the linkage is intact. Internal problems can include:
* Broken or worn bands: These are crucial for applying pressure to the clutches.
* Worn or damaged clutches: These are responsible for engaging the gears.
* Low or no line pressure: This could be caused by a faulty pump, pressure regulator valve, or other internal components.
* Valve body problems: The valve body controls fluid flow and gear selection. Problems here often require rebuilding or replacing the valve body.
* Broken input shaft or other internal components: These would be major repairs.
* Electrical Problems (if it's an electronically controlled transmission): Some later model Turbo 350s incorporate electronic controls. Faulty sensors, solenoids, or the transmission control module (TCM) could be to blame. This is less likely, given your description, but still possible for some years.
What to do:
1. Check the transmission fluid level and condition. This is the absolute first step.
2. Visually inspect the linkage and cable. Look for broken parts or disconnections.
3. If fluid is low or looks bad, don't drive it! Have it towed to a mechanic specializing in automatic transmissions.
4. If fluid is okay and the linkage is intact, you'll likely need professional help. Diagnosing internal transmission problems requires specialized tools and expertise. A transmission shop can properly diagnose the issue and provide a repair estimate.
Ignoring the problem will likely lead to significantly higher repair costs in the long run. Getting it towed and professionally diagnosed is the best course of action.
