Hey Dave

Great to hear you'll be joining us this year! For 540 2wd gear around 6.5 and 4wd around 7 and those ratios are my exact race ratios. For sport tuned, start off around 7.8 in 2wd and 8.4 in 4wd with the possibility of going a bit taller in both at confirming temps. I always end up at 7.5 in the 2wd but I do hear of others running a little taller but not worth it for me

Cheers

Michael