Originally Posted by HowIRoll
are you installing this without a BL? just curious if it could be done.
A few words about MMLs
Some people say that a MML must be used with a body lift; that is a myth. Motor mount lifts and body lifts are not related except that it would eliminate the need to re-locate the radiator or radiator shroud. Neither of those are a valid reason for a MML.
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. Therefore, it isnt really possible to calculate which (if any) MML is needed, simply by knowing how much lift is installed on a given vehicle.
That having been said, most vehicles that have as much as 6 of suspension lift would probably use a stock height, or a 1 MML (again, depending on the remainder of the configuration). A 2 MML has no place in this kind of vehicle.
For further information on correct drive line angles, go here and click on the links about halfway down the page. They do an excellent job of describing the elements of drive line angle.
Some abnormal circumstances in which MML's may be useful include custom frames, custom engine installations, or bodies that require a particular engine position due to an out of the ordinary configuration. These are also the kind of designs that might need a 2 MML. Most typical lifting and modification of stock vehicles do not fall in this category.