"So what i want to do is update this setup but i want to keep the electonics because they are all working fine"... Sorry but this doesn't make sense to me... You can't update and still use ALL the old stuff!

If you truly want to UPDATE like you said you will need to ditch the ESC and Brushed Motor. Swap to a brushless motor and water-cooled Brushless ESC. You can still use the servo and 27 mhz receiver if you really want to. You can get a cheap water-cooled brushless ESC and motor from hobbyking.com for about $50-$60 for both.

You'll most likely want to run more than a 6 cell nimh on a brushless motor, and in some cases you have to use more than 6 cells nimh. I would suggest getting at least a brand new 7-8 cell nimh pack, go to 2x 7cell NiMh packs or switch to Lipo batteries. (I still run nimh although most will recommend Lipo) Most of the ESC options you will buy will have a BEC that will eliminate the need for a AA battery pack.

What boat is the set-up from? Also If you meant UPDATE using your electronics and just get a new hull I would strongly consider just getting a new boat OR find a newer but used one on http://forums.offshoreelectrics.com/...isplay.php?f=3 - this is the swap shop on Offshoreelectrics.com. Always good stuff for sale there.

Good Luck and welcome to the site.