Reel kits to improve performance

Greetings,

I bought a Ambasaduer 2500 C1 several years ago and like the reel- casts good, smooth drag etc.
The guy who used to run the reel repair shop in Montesano told me there is a kit available to increase the gear ratio, this being the reels only flaw.
Has anyody heard of this? and if so, where might they be found?

Thanks in Advance, Mike S