Includes JBS clutch mods, primary sheave resurface & ECU reflash.

Fits 2012 – 2013 T4 Models

JBS clutch mods lowers the starting ratio in high, low & reverse from a dead stop .. it gets the tires turning easier.

Fixes the reverse issue of not enough power & helps the entire range.

It lowers the cab noise because it shifts out earlier on top end.

ECU reflash removes the speed limiter & raises the RPM’s, it also raises the diff & reverse limiters. The stock ECU shuts down @ 50 MPH after the reflash you will see 60 MPH on level & 62-65 MPH on a downhill.

Customer must send in their stock OEM parts to be modified/reflashed.

JBS Performance

131 Davis Ct.

Mount Hope, WV 25880

Please call with any questions!!

Clutch/Belt break in – run it easy for the first 4 or 5 miles to make sure the sheaves are clean before you punch it.