What other transmissions would fit a 1988 XJ40 3.6L?

The 1988 Jaguar XJ40 3.6L is typically equipped with a 4-speed automatic transmission (AW30-40LE). Other transmissions that could potentially fit include the ZF 4HP22, which was used in some other Jaguar models of that era. However, modifications may be necessary for proper fitment and compatibility with the engine and electronic controls. It's essential to consult with a specialist for specific compatibility and installation considerations.