[Uncle Dim]

I recently purchased a 2000 QC LB Auto. It appears stock but there is some evidence of previous experiments like velcro on the fuse box. Is there any good method to determin if the injector or tranny have been upgraded? I took careof the sterring box and vacum pump leak new I want to move on to an FASS and then some bombs. I hate to fix a tranny that doesn't need fixin. I'm in the Ogden area of Utah and any help would be much appreciated.