My son has a 1990 750il he bought last year. Only had 52,000 miles supposedly. 3 months after he bought it the transmission went out. Our local BMW dealer quoted him a price of $4000 to fix it with a rebuilt one. sounds like a good price after reading some other stories here. anyways we found a local BMW shop here that had a good reputation and they installed a used transmission back in it for $1800. Now 9 months later it is sometimes not shifting into gear when put in reverse or drive. When it does go into gear it will only drive for awhile (a mile maybe) before it starts slipping again. Anyone have any thoughts on this. I am trying to research before my son has to spend some more big bucks again. Thanks!