Carli Suspension 2 Degree Pinion Shim Kit 05-26 Ford F-250 / F-350 4x4 GDP-MK21318-BLKH Some of the jarring ride

Some of the jarring ride of the Super Duty rear can be attributed to the factory vulcanized bushings in the leaf spring pack and shackle

Built on a standard GTP38 platform

If you're running an aftermarket 4" exhaust system with a muffler and looking to straight pipe the system

Once the combination of heat and pressure exceeds what the plastic intercooler pipe can handle

By addressing driveline angles

Carli Suspension 2 Degree Pinion Shim Kit 05-26 Ford F-250 / F-350 4x4 GDP-MK21318-BLKH Some of the jarring rideEver had a shimmy in the backend of your Carli lifted Ford while underload? If you're running full spring packs and you have a 2020+ truck, it could be you're a little low on your pinion angle. Through lots of testing, Carli has come out with these 2 degree pinion shims to help get your truck back to riding smooth. Through their testing, they found it was happening only on 2020+ Ford trucks with Full Spring Packs. Factory leafs and or Add A Leaf