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JEEP Model, Year, and Engine We ONLY SUPPORT those vehicles and engines listed below. Grand Cherokee: No Products

Woodpecker Trail near Florence, Arizona

Frequently Asked Questions.
Before you call, remember, we only make parts for Jeep.

Return Policy

The basics.
Why Brown Dog motor mounts?
What is the bushing material like?
Do your motor mounts have the stud on the inboard side?
Do you make engine brackets (plates) that work with aftermarket headers?
Where are Brown Dog products tested?
Vibration and motor mounts.
Is it true  high performance motor mounts transmit more engine vibration? 
May I experience more noticeable vibration when these are properly installed?
Any other pointers for reducing vibration when upgrading?
A few words about MMLs. 
Does a body lift (BL) require motor mount lifts (MML)?
How can a MML correct Drive Line Angle issues?
How much lift is needed to get rid of driveline vibration?
Do I need the rare 2" MML?

Return Policy

Full Refund: Products that are returned within 90 days of purchase must be in original packaging and wrapping.  The product must be complete, including all installation hardware.  A full refund minus the original shipping charge will be given.  Return packaging must prevent any damage to the product to qualify for this refund.  If these conditions are not met, the following applies:

On returned products we reserve the right to determine how much of the original purchase price will be refunded.  Considerations for this determination is the condition of the product when we receive it, damage from installation and removal, damage for any other reasons.  Shipping is not refundable under any normal circumstance.

Beyond 90 days after the purchase refunds will not be made. 

The basics.
Why Brown Dog motor mounts?
One reason: They are engineered to take the abuse of extreme driving. If a weld doesn't hold -- and every joint is double-welded -- we'll replace them for no charge .
If you happen to break the plate steel, we congratulate you. We also want action photos, because it must have been amazing! Then call us so we can get another one on it's way. See our life-time warranty for details.
Any other reasons to buy Brown Dog products?
  • Made in USA. Not just final assembly, either. All the bushings are made here. Everything is engineered, cut, cleaned, welded, baked, assembled and packaged in the USA. And we're proud of it.
  • Priority Mail Shipping. All products. Any USA state, territory, or APO/FPO/DPO (military) address.
  • Grade 8 (10.9 metric) hardware included, no extra charge.
  • More steel and double-welded when feasible.
  • Straight forward installation. Everything bolts on or in. No grinding, welding or tapping. Modification is very, very rare. (We'd say never, but we haven't seen every vehicle made by Jeep that's still running.)
  • Choice of rubber or polyurethane bushings.
  • Extended hours and weekend technical assistance usually available.
  • Backed by life-time warranty.
What is the bushing material like?
We offer a choice. Select Ultra-Flex Rubber motor mounts and motor mount lifts to better absorb some drive-line vibration. Select Classic Polyurethane to give your rig a sportier feel.  To learn more about the difference between our Ultra-Flex Rubber and Classic Polyurethane bushings, click here.

Do you make engine brackets that work with aftermarket headers?
Yes, every Brown Dog driver side engine bracket is compatible with after-market headers. Simply order the correct engine bracket for your vehicle year and engine.
Where are Brown Dog products tested?
Some of the toughest trails Arizona can dish out. (Yeah, we know about Utah, but we can't stand the cold.) We also periodically apply the
20-Ton Press Test just to test motor mount's integrity. So if you're on the trails in Arizona,
watch for the Yellow 1991 Wrangler YJ  You'll most likely see us around Florence, AZ.

Vibration and motor mounts. 
Is it true  high performance motor mounts transmit more engine vibration? 
Stock mounts were totally designed for vibration dampening. In fact, some OE parts catalogs list the part name as vibration dampeners or isolators. Any time you go to more steel and less absorbitive material, you can expect some vibration to be transmitted; this is especially true in uni-body vehicles like the Jeep Cherokee XJ (the body is your frame). Generally, the 2.5L (4-cylinder) engine is more likely to transmit vibration than the 4.0L (6-cylinder) engines, which transmit little if any.
May I experience more noticeable vibration from Brown Dog motor mounts when properly installed?
Brown Dog high performance motor mounts (MM) and motor mount lifts (MML) for Jeep are designed differently than others; we believe less engine vibration is transmitted by our mounts than by other performance motor mounts. In addition to design differences, following Brown Dog installation instructions (including torque and tightening instructions) is very important to minimizing vibration. 
Any other pointers for reducing vibration?
First, double-check to be sure torque and other tightening instructions were carefully followed when installing Brown Dog high performance Jeep motor mounts (MM) or motor mount lifts (MML).
Second, be sure your transmission mount is in good condition and properly installed. In testing, we found worn out transmission mounts may not be obvious with older stock mounts. However, installation of high performance mounts accentuates the vibration caused by worn-out transmission mounts. We have found drive line vibration caused by a worn or broken transmission mount mistaken for engine vibration when installing new motor mounts. We have demonstrated this in our own tests.

Third, check for a faulty harmonic balancer. This is not often the problem, but needs to be checked.  The harmonic balancer on Jeep engines is the front pully on the crankshaft that has the timing mark on it. Go here to read a good explanation of a harmonic balancer:
Fourth, and often major vibration culprit which must be evaluated, is improper driveshaft alignment and pinion angle. If you have installed a suspension lift on your Wrangler, you might consider our 1" or 2" motor mount lifts as a part of your driveshaft/driveline angle solution. Here are a couple excellent articles about this issue:
        1. angle/,
Another important thing you can do to eliminate vibration is to install a slip yoke eliminator (SYE). We recommend the Advance Adapter SYE.

A few words about Motor Mount Lifts. 

Myth: Body Lifts (BL) require Motor Mount Lifts (MML).

Some people say that a motor mount lift 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. Check for adequate space between the bell housing and floor pan, and clearance between the highest point on the engine assembly and the hood


Using Motor Mount Lifts to correct Drive Line Angle issues.

Now we're talking.  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 links above do an excellent job of describing the elements of drive line angle. 

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 1.5" MML based on the amount of your suspension lift and/or body lift alone.  
Most vehicles that have as much as 4.5” 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 drive shaft, worn u-joints, 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. Note:  Wear patterns are established in universal joints.  Changing the driveline angle means new wear patterns need to be established (this will likely cause vibrations).  When I make a driveline angle change, I replace the universal joints.


Do I need the rare 2" MML?

Probably not.  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 highest point on the engine assembly and the hood; this can be done by putting a ball of modeling clay on the highest part of the engine installation and closing the hood (measure the resulting ball). 
  • Remember, you're moving the entire engine assembly 2" upward at the radiator fan.  The fan shroud will need to be moved upward to accommodate the change.  In some vehicles (YJ) the shroud can easily be relocated.  In other vehicles you need to relocate the radiator.
    Call us for advice

Still not sure which product 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.