Well MOPAR makes a nice kit and it's covered by them for 3yr/36k but if you get a BDS LiftKit it has this warranty:
No Fine Print Warranty:
If you are the original purchaser of any BDS product and it breaks, we will give you a new part. Period.
Shock and Stabilizer Cylinders Limited Lifetime Warranty
BDS Suspension Co. warrants to the original retail purchaser that its shock and stabilizer cylinders are free from defects in material and workmanship for so long as they own the vehicle. Excluded from this warranty are the finish of the product and mounting bushings. Defects in material and workmanship do not include such things as dented cylinders or bent rods caused by obvious side impact, rust, worn or deformed bushings. A shock absorber is a wear item and over time will experience diminished damping resistance due to normal component wear. This is not a defect in material or workmanship and is therefore not warrantable.
BDS Suspension's obligation under all warranties is limited to the repair or replacement, at BDS's option, of the defective material. Any cost of removal, installation or reinstallation, freight charges, incidental or consequential damages are expressly excluded from these warranties.
If you can find a better one you let me know but this so far is the BEST on the market.