7.3 Powerstroke John Wood Valve Body
The 7.3 Powerstroke John Wood Valve Body, also known as a JWB, is a custom engine part made by John Wood Automotive, one of the premier E40D/4R100 builders in the country. It helps improve shift quality and does not add a lag when shifting, a feature that is extremely important for many drivers. This valve body works well with most aftermarket transmission tuning, too, so if your truck has a transmission problem, you should consider the Johnwood Accumulator Body.
