Couple questions for you guys, I am getting my FTB4.1 today (the post office had lost the box for over a week and a half)

I am going to be running a grear diff in it (got one in my T4.1 as well) what fluids are you guys going with for a med/high traction tight indoor track? Local guys are running 3k in their trucks.

Now onto batteries will a 30c rating pack be enough for stock 17.5? Plan to go with GensAce I have had great luck with them in my 1/8ths as well. I am not even close to the fast guy at my track .... still working on driving skills so keep that in mind.

One more thing do you guys know what size bearings are used in the front wheels for the B4.1 and T4.1? I got a bearing kit from Avid and did not look to see if those are included or not Either way I would like to order up a few extras to have.