what i know about the first automatic gearboxes of the XM is that they need perfect maintainance, otherwise they can end up as soup within the 100K. What happened before it totally crapped out on you? was there a period where the car wouldn't react anymore, but after switching to park and back to drive it worked again? did it make a whistle kind of sound? if this is the case i'm affraid that you'll be having a very expensive repair coming up :unsure: I wish I could give you better news, but these gearboxes just seem to all die all of the sudden. there is no computer in them which can cause troubles, this gearbox (4HP18) is controlled by the ATF, the speed of the car and the position of the gasthrottle, and everything is "programmed" by the strength of the different springs inside. If you want to replace this gearbox you'll have to get the engine out, but this gives you a nice oppurtunity to really give it a nice cleaning job under the hood, and replace the timingbelt (while you're at it) but keep in mind that an automatic gearbox (and do take a revised one or better a new one!) will cost you around 1000 pounds (thats an average price here in holland) best of luck with your XM those are truly wonderfull cars and with 90K (is that miles or kilometers) it should be able to go on for a couple more years!