Will a transmission off 1993 Lincoln Town Car fit on 1990 Car?

It's unlikely a transmission from a 1993 Lincoln Town Car will fit a 1990 Lincoln Town Car without significant issues, even though they are both Town Cars. While the cars share a platform, there were likely changes to the transmission over those three model years.

Factors to consider include:

* Transmission type: Even if both cars used automatic transmissions, the specific type (e.g., AOD, 4R70W, etc.) might differ. These are not interchangeable.

* Bolt patterns: The transmission's bellhousing, which bolts to the engine, may have a different bolt pattern.

* Input shaft: The diameter of the input shaft where the torque converter connects could be different.

* Output shaft: The output shaft's spline count and length may vary.

* Computer compatibility: The transmission's control system might not be compatible with the 1990 car's computer. This could lead to shifting problems or non-functionality.

* Wiring harnesses: The wiring harness connectors for the transmission might be different.

You must check the specific transmission model numbers of both cars before attempting any swap. Even with matching model numbers, there's still a chance of minor incompatibilities. It's best to consult a repair manual or transmission specialist before proceeding. A seemingly small difference can make the swap impossible or cause significant problems.