Synergy Jeep JK Heavy Duty Metal-on-Metal Tie Rod Ends 7/8-18 LH Details: Fits 07-18 Jeep Wrangler JK and Wrangler Unlimited JK Synergy Jeep Heavy Duty Metal-on-Metal Tie Rod Ends Fully greasable sintered metal on metal bushing design has high wear resistance Specially designed grease grooves in the OD of the ball to allow for maximum lubrication Spring loaded bearing design keeps pressure on bearings and keeps the joint tight as it wears Forged bearing housing made from 1018 steel for a strong, smooth, bearing surface Tie Rod End stud made from 4140 steel with an induction heat treated bearing surface for smooth operation and maximum life Outperforms the factory and all other aftermarket style tie rod ends by offering: A larger shank with no stress riser (doesn't neck down at base), Elimination of the nylon ball race Boots are made from tear/wear resistant black NBR and come with retaining springs Includes all necessary hardware for installation 7/8-18 UNF LH Thread 4131-L are designed specifically to be used in the following Synergy products: 8001, 8002 (2x required per product) 4135-L and 4135-R are designed to be used in the following Synergy product: 8121-00 (3x 4135-L and 1x 4135-R required) Synergy High Performance Grease (4119) is the recommended grease for this product Sold Individually