well, the mechanic just came to my house and checked it out. and sure enough the tranny is slipping.

So could the fact that the car was idling at 4000rpm have played a role in the transmission messing up? I think that the constant beating being put on the tranny could of messed it up.
the tranny only started giving me problems once I got the car back from having the motor put in. The tranny is under warrenty so I'm sure I can get another one, but should these guys have to put it in for free?

I don't know what to do now, and I'm pretty sure I lost my job because of it.