Originally Posted by
RCFREAK
im almost sure it doesnt fit... i looked at both spools side by side, the cyclone bulkheads are wider than the transmission housing of the pro4, meaning the width will not fit due to the spacing.
Be 100% sure. The cyclone spool IS too wide for a pro 4. Best bet is to by the composite diff halves as they are cheap, take out the balls and use tc5 slipper pads. Be prepared to replace the diff halves often as spools put lots of stress on the outdrives. If you are racing on a track that needs a spool there will be no other way of being on the pace.