"We finally broke it @ the 500 hp level. There is a small collar that moves when you select 2wd or 4wd mode."
Thanks Scott for the update. If you are refering to the diferential sleeve, well I broke mine last year. Took the alltrac down from the dyno and went for a spin...forgot to put it back to 4wd

So now my car has a new one and with the help of my (gt3076r

) I´m hopping for 450 bhp. There´s no 4wd dyno in my country
Best Regards
Richard