PPE Transfer Case Brace 11+ GM Allison 1000 2000 Series 4X4 Transmissions - 129021115 4500 4-inch mandrel-bent pipe improves flow

4-inch mandrel-bent pipe improves flow up to 176 Percent with virtually no back pressure

Remove your crushed oval-shaped stock down-pipe and replace it with a smooth

and experience the heightened throttle response

The removable plug traps ferrous debris and can be accessed to remove particles from the system

higher continuous power at any exhaust gas temperature

PPE Transfer Case Brace 11+ GM Allison 1000 2000 Series 4X4 Transmissions - 129021115 4500 4-inch mandrel-bent pipe improves flowCracked transmission tail shaft housings (located between the transfer case and the transmission) are a common problem for GM Allison equipped 4x4 pick ups in off road and drag racing applications. Even a nominal amount of driveline vibration can cause the housing to fail, resulting in a transmission fluid leak or worse; internal transmission and transfer case damage. Once the housing cracks, repairing it requires removal of the transmission and