I upgraded my 2013 PA-14, ST Turbo Mirage drive last January and these are the individual part numbers needed to convert it to the GT drive.
1 each idler pulley-GT with bearings P/N 81123001 @ $7.00
2 each sprockets GT with bearings P/N 81127001 @ $22.00 each
2 each drum-GT with bearings P/N 81175001 @ $40.00 each
And lastly, since the drums did not have the pedal adjustment decals installed as I expected, I ordered after the fact;
2 each decals, pedal adjustment P/N 81172001 @ $0.70 each.
The total is $132.40 list price and I can confirm, it's worth the $$, time and effort to make the GT conversion
Here is the link to make the upgrade
http://static.hobiecat.com/item_attachm ... 01z117.pdfAlthough it does not show greasing the bearings, I used Evinrude Johnson Triple-Guard Grease..it's blue, totally waterproof and won't wash out in use.....the stuff is really sticky and you don't need much grease to do the job.
Make sure you use a small amount of "Blue Loctite" on the turbo fin threaded shafts prior to screwing back into the new sprocket inserts.
Good luck!