Trail Gears Dirty 30 Birfield Axles shafts and birfield housing are made out of 100% 4340 chromoly steel and are precision polished to remove any imperfections that may cause stress risers and failures. The internals of our Dirty 30 birfields are made out of 300M chromoly steel for maximum strength and reliability. The Dirty Thirty Axles also have a larger size axle shaft going into he birfield to eliminate the weak link in the assembly.
With over a decade of experience, Trail-Gear has been developing, designing and distributing products for adventurous off-roaders and especially wheelers into rockcrawling. Located in Fresno, California, the company specializes in suspension-related parts and accessories including bumpers, armor, axles and drivetrains. The company's employees live and breathe the off-roading lifestyle and Trail-Gear strives to keep their products affordable without cutting corners on design and quality. When you need suspension systems, recovery and towing accessories or lighting solutions, Trail-Gear can outfit you for the trail and beyond. Shop Trail Gear Now