Do you mean
this? (strangely better sounding but abruptly ending version
here)
...the quality of these sound clips does not amaze me, though. The former is an 8-bit, 12 kHz PCM waveform file and the latter 8-bit, 11kHz... and I have no idea where you would find a high quality clip of it.
It seems to be listed as a track on some Tranformers soundtracks, though, but I'm not sure if it's any better quality there.

EDIT: Oh, and I never watched Transformers in my childhood. They were a bit before my time. But google search of
transformers transition wav worked rather fine...
