Jeep Motor Mount Lifts (MML)

A few words about MMLs.

Myth: Body Lift requires a Motor Mount Lift.

Some people say that a MML must be used with a body lift; that is a myth.  Motor mount lifts (MML) and body lifts (BL) are not related except that a BL would eliminate the need to re-locate the radiator or fan shroud (also see 2” MML below).  A body lift, on its own, is not a valid reason for a MML.  That being said, a MML can be installed on a Cherokee.

Using a MML to correct Drive Line Angle issues.

Under normal circumstances, motor mount lifts have only one purpose: to help correct driveline angle issues that are causing vibrations and/or u-joint binding.  In fact, installing a MML on a vehicle with no vibration problems, may cause vibration.  Therefore, it's not really possible to calculate which (if any) MML is needed, simply by knowing how much lift is installed on a given vehicle.  The following link does an excellent job of describing the elements of drive line angle.  Drive Line Angle Information

How much lift is needed to get rid of driveline vibration?

As stated before, it's nearly impossible to determine if a vehicle is best with a stock-height motor mount or a 1" or 2" MML based on the amount of your suspension lift and/or body lift alone.  Most vehicles that have as much as 6” of suspension lift would probably use a stock height or 1” MML (depending on the remainder of the configuration).  A 2” MML has no place in most vehicles.  Remember, no MML will correct vibrations caused by a bent shaft or other failed part.  A MML will correct drive line alignment problems.  If this is the cause of your vibes, then a MML can be the solution.

About the rare 2" MML.

Some abnormal circumstances in which 2" MMLs may be useful include extreme suspension  lift, custom frames, custom engine installations, or bodies that require a particular engine position due to an out of the ordinary configuration.  Most typical lifts (up to about six inches) and other common modifications of stock vehicles do not fall in this category.  If you are considering installing a 2" MML, please check for enough clearance between the bell housing and floor pan. Also check for enough clearance between the valve cover and the hood; this can be done by putting a ball of modeling clay on the highest part of the valve cover and closing the hood (measure the resulting ball).  Remember, you're moving the entire engine assembly 2" upward at the radiator fan.

Still not sure which is best for you?
Give us a call, 866-401-3877. We want to be sure you get the correct motor mount for your vehicle.