Newbie to 4wd and chose a XX4 WE - Any advice?

[Randall34]

I have just got hold of a XX4 WE and i was wondering if anyone has a set up or a track like EPR, or tight bumpy astro. I have to run it with a stick pack lipo as i run 2wd too with the same cells. So its a tight squeeze behind the motor.
It has a purple spur (84t i think) so what pinion? (6.5t motor) and no diff at the front just a one way. Is there any advice on adding weight to balance the car? It weighs 1530g at the moment, and is 740g/790g side to side and 670g/860g front to back.
Any advice is appreciated as i haven't driven 4WD since i had a Cat XLS 18 years ago.
Thanks