AKA PTU (power transfer unit)
This is a Problem Child. Be it Mahindra XUV or duster. I have seen them fail. Most of these are not suited to Off-roading at all. They are more suited to Driving "Normally" on snow, preventing spinouts. They cannot take the full torque.
This is going rather OT Sandeep & I hope you'll bear with it!
bhvm, I wouldn't go so far as to write them off. Samba has taken his AWD duster (terrific photologue in T-BHP) right to the end of Sandakphu. And if it can make the cut there (which at my age - I'm running 70 - I frankly wouldn't want to
!) then in my lexicon that qualifies as proper off-roading.
And PTU is a serious misnomer. Transferring power is not the primary function of this coupling. It is there to compensate for the difference in speeds of the front & rear wheels, when making lock-to-lock turns (making do-nuts eg) on smooth tarmac, to prevent torque wind-up. For this reason the better equipped AWDrivers (the Quattro models from Audi eg) use torsen center differentials - with spectacular results in their earlier WRC events, when they wiped off the competition!
Mahindra have had the guts to offer AWD on their XUV models (which few other mfrs have done in India, despite their "SUV" line-up!
) and such relatively high-tech items need proper "development & lead times". I'm sure their XUV700 AWD would have ironed out these niggles.