2000 supra santera with a hurth hsw 450d transmission.
Boat has been great but as of late i have been adding more and more weight for surfing. In doing so i have noticed the rpm's starting to fluctuate. This is also accompanied by an occasional shudder when the rpm's come back down. The boat doesn't seem to have any fluctuation out of the hole when pulling a skier and getting on plane, just when slammed and surfing. My question is would the transmission slip all the time or only under a heavy load like surfing? I would love some input before pulling the tranny and doing what might be an unnecessary rebuild. Thanks!