Hey Guys, I have a problem with my 2001 LW300. The cars runs great and we really have any major problems, but once in a while(about every 3 weeks) the transmission will shift kind of roughly and then the "Check Engine Soon" light pops on. I had it checked today at Discount Auto and its showing a P1780(TCM Mil Request) and a P0727(Engine Speed Sensor, CKT, No signal). What's unusual is that the reserch I have done doesn't show this sensor anywhere on my car. Not even in the manuals. Discount Auto didn't even have the part listed for my car. Anybody know anything about this and how I can fix the problem. Thanks. Kyle