Mitsubishi Challenger Gearbox & Transmission Problems

Before you rush off and claim you’ve copped a lemon I would investigate the reason for the problem. I suspect there is a problem with the vehicle rather than an issue with its ability to tow. Have your dealer check it out.

This model Challenger did have a history of engine overheating, largely due to poor surface preparation between the cylinder head and crankcase, allowing coolant to be consumed by the engine. Mitsubishi made production changes that resulted in a smoother head-gasket mating surface, but that's no help to owners of the earlier version.

In any case, that probably shouldn't affect the transmission and if it's dropping into neutral of its own accord then something – possibly electronic – is going wrong., It's unlikely to be a limp-home response as being in neutral doesn't allow you to limp anywhere, let alone home. But it could be a legitimate response to a transmission heat situation. Have you checked the level of transmission fluid?

A scan of the vehicle might throw up a clue, but it could also easily be something as simple as a transmission selector that is poorly adjusted and allowing the gearbox to select neutral on rough on uneven ground. Another possibility is that the transmission is, indeed, getting hot as a result of the engine temperature creeping up. The transmission cooler is part of the engine's cooling system, so the two are definitely linked.