I got revo 3.3 on on 2.5 revo. Gona replace bell clutch, I have a 40t spur gear what teeth do I need on bell clutch? An how do I get it off motor and replace bearings.
I don't have any advice about the tooth count for a new clutch bell, but to get it off of the motor, there is a C-clip on the end of the bell. Take that off and then the clutch assembly comes off and you will be able to replace the bearings.
14/38 is stock on a 3.3 revo. 15/40 is pretty close and I'm pretty sure I've run it on mine (big block conversion), but I wouldn't vouch for it fitting on a stock revo.
15/36-40 will work fine on a stock revo. I use 15/36 on my 2.5 chassis (picco 21), but it works well with a 3.3 too. My 27 powered revo uses 18/36. 15/38 is the stock ratio on all but the newest version of the revo (the one with the bigger tires has 14/38).