For what it's worth, here's my experience with Sun Valley: I was given a 1980 300 TD with 390 k miles and a failing rebuilt tranny (I don't know where the rebuilt was from.) I got a rebuilt from Sun Valley for $1050 plus $125 shipping, and my 17 year-old son and I installed it using a rented jack ($30.000). This was one year ago; it's running perfectly - several thousand miles. Steve