Big Block T-Maxx question
 

I have a new-era .21 conversion for my maxx which was the original version and I need to get a new .21. My question is what .21 will fit behind the tranny? I hear the RG wont but I don't want to put a ton into the motor. I originally had the Ofna P4 but it is in need of replacement...will pilot shaft work or do I need a short shaft?

I would like to put a Hyper .21 in it..... lemme know.