Torq-Masters Chromoly Rear Axle Shaft Assembled Pair Jeep JK 2007 to 2018. Torq-Masters 4140 Chromoly Axle Shafts are an essential upgrade Offroaders looking to get the most out of their vehicle. Our Heavy Duty shafts are built to such high quality standards that we can offer an exclusive Lifetime Warranty, giving you piece of mind in the most extreme situations. Torq-Masters 4140 Chromoly axle shafts ship fully assembled. These axles ship standard for Drum Brakes. 4140 Chromoly Lifetime Warranty Ships Fully Assembled Stock Replacement Axle Shafts Ships Same Day