I assume it's a 4 speed auto. Sounds like a sensor gone down, you need to go to a dealer and get the transmission scanned for faults.
Can't help you with the gear problem there are many wiser gents on here that can. The air suspension problem if it's a Range Rover there is a Wheeler Dealer episode on the Range Rover explaining what goes wrong and the cure.
Have you considered a used box with a guarantee on it?Either way, many scrap/reclamation yards do a supply and fit service as well, which can help control spiralling costs.
Sorry to hear that!Which vehicle gearbox is it, the Jeep or the Land Rover?Have you considered a used box with a guarantee on it?Either way, many scrap/reclamation yards do a supply and fit service as well, which can help control spiralling costs.
Sounds cheap to me.