My 2 month granite blx has a metal layshaft gear and a plastic idler gear and the other night the metal layshaft gear shredded the idler gear. Extremely frustrating considering I've also had the granite bls for over a year which has a plastic layshaft gear and besides upkeep and routine maintenance I haven't replaced anything in the diff on that truck. Any recommendations as far as if I should go all metal or if I should just replace it with the stock idler gear?