Occuring at 40 to 45 MPH usually has a root cause in wheel balance. First thing I would do is to swap the front and rear wheels, and see if it still happens. Any looseness in the trackbar will aggravate it. A wheel out of round can cause it. A bad motor mount can cause a reaction like death wobble.

More or less weight in your vehicle can change the angles of your suspension or ride height, and this is where an adjustable track bar can really help dial in your rig’s suspension. SOURCE

Fits Jeep: Jeep Grand Cherokee (WK) (2012-2022) w/ 4WD; Front Drive Shaft to Front Axle or Transfer Case. Jeep Grand Cherokee (WK) (2016-2021) w/ 4WD; w/ 195mm Rear Axle; Rear Drive Shaft to Transfer Case. Jeep Grand Cherokee (WK) (2014-2015) w/ 4WD; w/ 3.6L engine; w/ 195mm Rear Axle; Rear Drive Shaft to Transfer Case.
One style of twin-tube shock is known as the Hydro series, such as the Quadratec 7.0. These use an internal hydraulic fluid that can travel from a working chamber into the outer chamber via valves to provide a moderately better ride than factory shocks. The other style, termed Nitro like the Quadratec 8.0 series shock, uses 150 pounds per
Jeep Grand Cherokee WJ 99-04 Climate Control Heater Heat AC Switch OEM 55115904 (Fits: 2001 Jeep Grand Cherokee) Pre-Owned : Jeep (5) 5 product ratings - Jeep Grand Cherokee WJ 99-04 Climate Control Heater Heat AC Switch OEM 55115904
1999 Jeep Grand Cherokee Exterior Accessories. Running Boards. Custom Grilles. Chrome Trim. Off-Road Bumpers. Grille Guards. Towing & Hitches. Headlights. Tail Lights. oiJ38Q. 132 37 9 328 351 146 180 72 64

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