The mods you do will depend on what how you want the car to perform, i wanted a trial truck so these are the mods i have done over the last two years to one of my XC's, its performance off road is very impressive........................
This is what i have done:-
Chassis:
Cut off the front off the chassis for better approach angle.
Cut off all the unnecessary lugs.
Transmission:
Locked diffs front & rear
Ballraces throughout
Universal joint front shafts
Fitted a motor / gearbox conversion with a toothed belt drive
Gearbox uses M3 screws & bolts instead of self tapping screws
Suspension:
Modified front and rear suspension for extra travel
Scratch built rear suspension trailling links
Steering:
Modified steering for more lock
Aluminium steering from Roger in Germany
High torque servo
Metal servo mount
Electrics:
Mtroniks ESC
Other:
Thrown away the body shell and fitted a modified Bruder Actros cab, with scratch built rear bed and roll bar
I use Carson tyres as they are a bit softer than Tamiya
Lead rings inside tyres
Good luck!!
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