hey guys im getting ready for the moroso motorsports park event on the the 31st of march. (palm beach sport compact nats'.)

i got some questions-

1.- is welding the spider gears okay to do or should i just get a spool?
2.- Nitto 555r's or MT E.T. streets?
3.- 275-60-15 or 315-50-15 D.R.?
4.- good tranny fluid for the 4l60e?

other misc **** i gotta do to get ready-
Cap/rotor change- + MSD wires.
change tranny fluid and oil
replace upper intake manifold gasket (its leaking)
water/watter wetter mixture for coolant.
Change plugs
Weld beeds on the end of maf housings to keep from blowing off.