Tranny: I replaced the tranny awhile ago, and now I am experiencing a bang sometimes when shift from 3rd gear to 4th gear. Sometimes it works fine. But sometimes the car might even shake while it is shifting? Is it a big problem? I brought it back and the mechanic said the pressure is too high and said is not a big deal. Can somebody help? Does anyone knows if the transmission have adjustment that you can do like the mercedes? Thanks!