Is a HF 2.5 with a whisper drive Skarrd. Just a Max Tourq clutch and pulley. Dunno if can be seen in this pic but clear cover supports a bearing for the final shaft.
Vid is a lil easier to see; Vids :: whisper drive/HF Engine video by dan3xd - Photobucket
The only problem with the HF 2.5s. They just can't climb. Tried though. just look at the path it made getting a running start.
Now the "Slinky" theme song is playing in my head, lol
Vids :: HFs can't climb video by dan3xd - Photobucket