The automatic transmission is made by allison..its the brand name. The manual transmission is not made by allison
2007.5 Chevy 2500HD ccsb Duramax/Allison, victory red, 4x4, Quadzilla stealth 2 with MBRP 4" staright pipe DPF deleted, EGR blocked, GLowshift LED EGT gauge, Top gun 2.5" levelling kit, Overload springs on rear. 18X9 Ultra Mavericks wrapped with 295/70/18 (34.3) Nitto Trail Grappler MT's. Bilstein 5100 series shocks, Spray in bed liner, B&W flip ball gooseneck hitch.