22 Diff Question

[jimbo_468]

Hi I have just brought a used 22 from Ebay (I'm a newbie).
I have brought a motor and ESC and fitted that last night. Everything works ok and I made sure the motor pinion wasn't too tight onto the spur.
I am using a Viper EXC and 7.5t motor (sensored) and a 23t pinion. This will have the power turned right down until my driving improves!!

However, when i turn one or both wheels by hand, or push the car along the table, its really 'notchy'. Is this normal? if not what could be the problem?
The car came with a few spares including the TLR diff rebuild kit. As I don't really know the cars history, am I better off just rebuilding the diff using the kit anyway?

Also - daft question time. When i spin the wheels in the air with the motor, they balloon up (like the monster truck tyres etc). Is this down to crap tyres (they are brand new and pre glued by the last owner - bowties), or will it sort itself out when actually going down the track?

Many thanks - Jim.