On the way home from work tonight I noticed it does not do it when cold,after I stopped at the bank it started buzzing when I started it back up but most of it went away when I got home. The reason I got this trans is I converted my bronco to 2wd since it had front differential issues and always wanted a 2wd version that was never made,when I was told it had a bunch of metal in it I did not use the torque convertor from this trans but used the convertor from the 4wd trans that was working great. The 4wd trans worked perfectly but I did not want the extra weight of the transfercase so I got a 2wd trans,even though the 4wd trans was good I did flush the lines and cooler so I think its just issues with this trans. The guy I had build the trans told me it had wrong parts in it and now wish he would have told me to find another trans to rebuild like he did with a C-4 I had him rebuild,I am going to do a fluid and filter change soon and see if it improves.