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GCM (Gross Combination Mass) is the total weight that a vehicle can carry or tow. Through GCM upgrade, one can increase the capacity of carrying the load. Mostly following things are being upgraded such as suspension Leaf springs, shocks, shackles, bushes, U-bolts etc. Finally after fitment a Full wheel alignment is done. A new GCM stated compliance plate fitted to vehicle with the details of the modification.