For those with a Allison transmission but dream of having 6 forward gears, look no further than to the PPE 5 to 6 Speed Conversion Kit. Adding Available for: Duramax Allison 1000 Five Speed Automatic Transmissions.
Has anyone put the 5- 6 speed conversion valve body in their allison? Is it worth the money? Change 5 speed to a 6 speed.
Allison 1000 5 Speed 6 Speed Conversion for the GM Duramax diesels.