The 4k Governor Spring Kit or GSK is a combination of custom designed springs and unique seats. The 4k GSK is designed to allow your truck to enjoy the benefits of full fueling through 4000 rpms. The result is a truck that is much more responsive and fun to drive.
Dramatically changes the driving experience by making your truck much more responsive at the upper end of the rpm band. Highly recommended for anyone with the short rear-end gears... especially if you tow heavy. This kit is designed for a competition or performance oriented truck, you must install 60lb valve springs for this product to be considered safe
Try this kit and see why our competition is screaming about it (yes we've actually had phone calls).