Possible Compatibility Issues:
* Transmission Code: The most important factor is the transmission code. Both the 190E 2.6 and the 300E likely have different transmission codes (look for a sticker on the transmission itself). If the codes aren't the same, you'll likely have problems with the shift patterns and overall functionality.
* Bell Housing: The bell housing, which attaches the transmission to the engine, may have different bolt patterns. This could mean the 300E transmission won't physically bolt to the 190E engine.
* Engine Power Output: The 300E has a more powerful engine than the 190E. This can impact the transmission's ability to handle the higher torque output and could lead to premature wear or failure.
* Electronic Control: The transmissions on these cars may have different electronic control units (ECUs) or wiring harnesses. You might need to modify or replace these systems for the new transmission to work correctly.
* Kickdown Cable: The kickdown cable, which connects the transmission to the accelerator pedal, may be different lengths or have different attachment points. You might need to adjust or modify the cable.
Other Potential Complications:
* Driveshaft: The driveshaft connecting the transmission to the rear axle could be a different length or have different mounting points.
* Exhaust System: The exhaust system might need to be modified or repositioned to clear the new transmission.
* Electrical Connections: You'll need to ensure all electrical connections are compatible and properly wired.
Recommendation:
Before attempting this swap, it's strongly advised to consult with a qualified Mercedes-Benz mechanic or specialist. They can help determine if the transmission swap is feasible and can identify any potential issues.
It's also important to consider the potential costs involved, as this could be a complex and expensive project. It might be more practical to focus on rebuilding your existing transmission, if possible, or look for a used transmission specifically designed for your 1990 190E 2.6.
