4 Link Suspension Mount Skid System for Jeep TJ / LJ

4 Link Suspension Mount Skid System for Jeep TJ / LJ

Name: 4 Link Suspension Mount Skid System for Jeep TJ / LJ
Brand: Motobilt
SKU: MB1517
Price: 1469.00 USD
Availability: InStock

25% OFF Regular price~~$1,469.00~~Sale price$1,101.75

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Unit Price: / Sku: MB1517

Fits: Jeep Wrangler TJ / LJ

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Product details

Once a Jeep TJ or LJ moves past factory control arm suspension and into a real linked chassis, the frame side mounting points become one of the biggest fabrication challenges in the build. Getting the upper and lower link mounts in the correct location takes time, and if the frame side structure is wrong, the entire suspension layout suffers. Builders end up spending a lot of time measuring, mocking up brackets, and trying to keep everything square while still packaging the skid, drivetrain, and frame rails correctly.

The Motobilt Jeep TJ / LJ Four Link Suspension Kit is designed to remove much of that guesswork by providing a fully welded frame side assembly that houses both the upper and lower links for the front and rear suspension. The rear utilizes a 4 link design, while the front can be run as either a 3 link with a track bar or a true 4 link front depending on the steering system being used. The parts locate from the factory skid plate mounting holes, which simplifies positioning during installation while still allowing the system to be welded solidly to the frame.

This kit is built for serious fabrication work. The skid and main link mount bodies are made from 1/4 inch steel plate, while the secondary boxing plates and internal gussets are 3/16 inch steel plate. The link mounts are completely boxed for strength and designed around specific rod end and spacer dimensions that are important to proper fitment. This system was developed for builders putting together high-clearance TJ and LJ chassis with a wheelbase range of 104 to 118 inches. It is a foundation piece for linked suspension builds where strength, layout, and suspension packaging matter.

Recommended Suspension Joint Details

Lower Links

Require a heim joint with a 1 1/4 inch threaded shank
Bolt hole size is 1 inch
The 1 inch bolt hole will be reduced to a 3/4 inch bolt hole
Reduction is done using 1 inch to 3/4 inch high misalignment spacers
Spacer width must measure 2 5/8 inches
Lower link boxes have a mounting width of 2.63 inches
Lower link mounts were designed with 1.25 inch x 1 inch rod ends with 1 inch x 3/4 inch high misalignment spacers
Johnny Joints with the same 2.63 inch mounting width can be used, but may require weld washers to change the bolt hole size, which is 3/4 inch
If using a Johnny style joint in the lower link mounts, MB1575 weld/reducer washers will allow you to weld into the lower link mounts and convert them from a 3/4 inch hole to a 9/16 inch hole

Upper Links

Use a heim joint with a 7/8 inch threaded shank
Bolt hole size is 3/4 inch
The 3/4 inch bolt hole will be reduced to a 5/8 inch hole
Reduction is done using 3/4 inch to 5/8 inch high misalignment spacers
Spacer width must measure 1 3/4 inches
Upper link mounts were designed for 7/8 inch x 3/4 inch rod ends with 3/4 inch x 5/8 inch high misalignment spacers
Upper mounts will not work with Johnny Joints
The 7/8 inch rod ends were chosen to keep the mounts tight to the front frame rails and allow room for many different engine setups

Important information

Designed for Jeep TJ and LJ 4 link suspension conversions
Rear utilizes a 4 link design
Front can be run as a 3 link with a track bar or as a true 4 link
Designed with a wheelbase range of 104 to 118 inches
Main bodies and skid are 1/4 inch steel plate
Secondary plates and internal gusseting are 3/16 inch steel plate
Ships fully welded and ready to install
Requires welding to the frame
Does not require body removal for installation
Parts locate using the factory skid plate mounting holes
Sold as a kit
Approximate weight is 126 lbs

Suggested related part not included: Universal Transmission Crossmember Kit part number MB3077

Product specifications

Vehicle Fitment

Jeep TJ / LJ

Suspension Configuration

Rear 4 link

Front 3 link with track bar or front 4 link

Material

Main bodies: 1/4 inch steel plate

Secondary plates: 3/16 inch steel plate

Wheelbase Range

104 to 118 inches

Weight

126 lbs approx.

Manufactured

Made in the USA

Notes

Requires removal of the factory spring hangers
Link mount sections bolt to the factory skid plate mounting locations for initial positioning
Included skid plate attaches to the system during installation
Kit requires welding to the frame and is not a bolt-in kit
Body does not need to be removed to install
If front suspension is being run as a 3 link, simply remove the upper link mount on the front side not being used
Motobilt track bar brackets can be used if running the front in a 3 link configuration
If using a traditional steering box or hydraulic assist, the front is often run as a 3 link with track bar to prevent bump steer
If using hydraulic steering, the front can be run as a true 4 link

Frequently asked questions

Is this a complete frame side mount kit for a linked TJ or LJ build?
Yes. This kit consists of the frame side assembly that houses both the upper and lower links for the front and rear linked suspension layout.

Can the front be run as either a 3 link or 4 link?
Yes. The front can be run as a 3 link with a track bar, or as a true 4 link depending on the steering system and build layout.

Is this a bolt-in kit?
No. The parts locate easily using the factory skid plate mounting holes, but the system must be welded to the frame. It is not a bolt-in kit.

Do I have to remove the body to install it?
No. Body removal is not required for installation.

What wheelbase was this kit designed around?
This kit was designed with a wheelbase range of 104 to 118 inches.

Can I use Johnny Joints with this kit?
Johnny Joints can be used in the lower link mounts if they match the 2.63 inch mounting width, but weld washers may be required to change the bolt hole size from 3/4 inch to 9/16 inch. The upper mounts will not work with Johnny Joints.

What transmission crossmember is suggested with this kit?
Motobilt suggests the Universal Transmission Crossmember Kit, part number MB3077, which is not included.

Additional product details & documents

If you are looking to swap your Jeep TJ or LJ to a 4 link suspension then this is the kit for you. The rear utilizes a 4 link design while the front can be used as a 3 or 4 link. This is the new 4 link assembly for the frame side on a Jeep TJ. Building high quality fabricated products for offroad vehicles is the mission. The Motobilt Jeep TJ / LJ Four Link Suspension Kit consists of an assembly that mounts onto the frame and houses both the upper and lower links for the front and rear 4 link suspension. This kit was designed to make it easier to install 4 linked suspension by taking out the guess work.

The kit is fabricated from high strength CNC laser cut steel plate. The main bodies where the links bolt in and the skid are all 1/4 inch steel plate for ultimate strength. Some of the secondary plates to box in the link mounts and internal gusseting are 3/16 inch steel plate. The design comes to you fully welded and ready to install into the Jeep. Once receiving the kit you will be required to weld the parts in place. The parts are located very easily with the factory skid plate mounting holes.

Specifications

Jeep TJ /LJ Four Link Suspension Kit
Front can be run as a 3 link with a track bar also.
Main bodies 1/4 inch steel plate
Secondary plates 3/16 inch steel plate
Sold as kit
Weight: 126lbs (approx.)
Suggested Parts Not Included below:
Universal Transmission Cross member kit par number MB3077

Note:

Requires welding the parts in place
The front suspension can be run as a 3 link which is often used with a track bar when running a traditional steering box or hydraulic assist to prevent bump steer.
If you are utilizing hydraulic steering then you can run the front as true 4 link front.
You do NOT have to remove the body to install.
If you are trying to install a Johnny style joint in the lower link mounts then the MB1575 weld/reducer washers will allow you to weld into the lower link mounts and convert them from a 3/4” hole to a 9/16” hole which is a more common size for Johnny Joint style ends.

Recommended Suspension Joints:

Size Chart-Click Here

The lower links will require a heim joint with a 1 1/4 inch threaded shank and bolt hole size of 1 inch. The 1” bolt hole will be reduced to a 3/4” bolt hole using 1 inch to 3/4 inch high misalignment spacers measuring 2 5/8 inches in width
The upper links use 7/8 inch threaded shank heim joint with 3/4 inch bolt hole that will be reduced to a 5/8 inch hole using a 3/4 inch to 5/8 inch high misalignment spacers measuring 1 3/4 inches in width

Kit Components:

The Motobilt Jeep TJ 4 link kit is very simple to install. Once the factory spring hangers are removed you will bolt the link mount sections to the factory skid plate mounting locations.

Then attach the skid plate we provide with the kit. This kit does require welding to the frame. It is NOT simply a bolt in kit.

The Motobilt TJ 4 link mounting system can easily be modified to a front 3 link if required. Simply remove the upper link mount on the front not being used. We offer the track bar brackets that can be used also if running the front in a 3-link configuration.

The kit was designed with a wheelbase range of 104 to 118 inches.

The link mounts were built with strength in mind as they are completely boxed. The skid and main sections of the link mounts are 1/4" steel. The lower link mounts were designed with 1.25" x 1" rod ends with 1" x 3/4" high misalignment spacers. The mounting width of the lower link boxes are 2.63 wide. Johnny Joints with the same 2.63" mounting width can be used but may require weld washers to change the bolt hole size which is 3/4".

The upper link mounts were designed for 7/8" x 3/4" rod ends with 3/4" x 5/8" high misalignment spacers. The uppers will not work with Johnny Joints. We chose the 7/8" rod ends to keep the mounts tight to the frame rails up front. By doing so it allows for many different engine setups.

Product Components

Instructions

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Instructions

Related parts & accessories

Recommended Suspension Joints:

Size Chart-Click Here

The lower links will require a heim joint with a 1 1/4 inch threaded shank and bolt hole size of 1 inch. The 1” bolt hole will be reduced to a 3/4” bolt hole using 1 inch to 3/4 inch high misalignment spacers measuring 2 5/8 inches in width
The upper links use 7/8 inch threaded shank heim joint with 3/4 inch bolt hole that will be reduced to a 5/8 inch hole using a 3/4 inch to 5/8 inch high misalignment spacers measuring 1 3/4 inches in width

Universal Transmission Cross member kit par number MB3077

4 Link Suspension Mount Skid System for Jeep TJ / LJ

Recommended Suspension Joint Details

Specifications

Instructions

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4 Link Suspension Mount Skid System for Jeep TJ / LJ

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