J&M Street / Race Rear Lower Control Arms Black (1999-2004 Mustang) 23959B

J&M Products – 1999-2004 Ford Mustang Street/Race Rear Lower Control Arms – Black

Part # 23959B  –  3 Piece Poly-Ball / Spherical Bearing Bushing Combo

Made In The USA

Control arm bushings found in the Mustang automobiles can have a significant impact on the vehicle’s ride, comfort, handling, acceleration, noise and vibration. When the car leans (i.e., rolls) in a turn, one side of the chassis moves upward relative to the rear axle, the other side moves downward, and the control arms must twist to allow for the axle to articulate. This causes the control arm bushings to bind. If this bind becomes excessive, it will raise the rear wheel rate and produce sudden, uncontrolled, undesirable changes in handling (e.g., snap oversteer). Lower Control Arms Rear Adjustable Mustang.

Ford minimizes this suspension bind by using compliant rubber bushings in both lower control arms. These relatively “soft” bushings help accommodate the necessary motion of the control arms during body roll. However, the rubber bushings do not provide much in the way of forward and aft support, which can cause wheel hop during hard acceleration and braking.

It has become common practice to replace the stock rubber control arm bushings with solid or two piece polyurethane bushings to resolve the shortcomings of the soft rubber bushings. Hard polyurethane bushings eliminate wheel hop, reduce axle deflection, and improve rear straight line grip. However, the downside of common aftermarket bushings such as delrin, steel, stiffer rubber, solid or two piece polyurethane bushings is they prevent the necessary movement of the control arms during body roll, which in turn produces significant binding in the suspension when the vehicle is cornering. The polyurethane bushings also place unnecessary high stresses on the torque boxes, which are the attachment points for the control arms to the chassis. Standard aftermarket control arms do not allow for rotation of the control arm during cornering because of the stiffness of the bushings. These Lower Control Arms Rear Adjustable Mustang offer many advantages ovrer other available products that do not incorporate all these design features. The bearing liner is attached with a thin sintered bronze wire net impregnated with PTFE powder, the same as utilized on modern long lasting automotive ball joints. Available in Black and Red Powdercoated finish

3 Piece Poly-Ball Bushing on Chassis & PTFE Spherical Bearing on Axle Side

We at J&M Products designed and built Lower Control Arms Rear Adjustable Mustang a tubular lower control arm which will eliminate the unwanted uncontrolled control arm flex. Round tubing is harder to work with but has many other advantages over square or rectangular tubing. It is stronger in bending, torsion, and also lighter than square or rectangular tubing.

Features and benefits:

• 52100 heat treated steel/hard chrome plated ball
• Bearing race is heat treated 4340 chrome moly steel
• Bearing liner is sintered bronze wire impregnated with PTFE powder, same as modern ball joints.
• Chrome-Moly spherical bearing on the axle side
• 3 Piece Poly-Ball Bushing on the chassis side
• Powder coated red or black for great looks & long lasting finish
• Everything including the tube is CNC laser cut for a perfect fit every time
• Pulse welded for superior strength
• Made In The USA
• 100% Lifetime Warranty

We then solved the shortcomings of the factory rubber and other aftermarket polyurethane and stiffer rubber bushings. This was accomplished with our proprietary 3 piece Poly-Ball bushing combination. By spending countless hours looking and dissecting the geometry and the need of the rear suspension we come out with bind-free bushings set up. Our proprietary Poly-Ball bushing combination incorporates a very hard inner polyurethane ball which is surrounded by soft socket outer cups. This combination allows the bushing to articulate like a spherical bearing during cornering but the hard inner ball does not allow the bushing to deflect during acceleration giving you great traction during acceleration like solid bushings but remains completely bind free like a spherical bearing during cornering for great predictable traction in the corners.

Mustang Lower Control Arms 79-98 Ford Mustang Rear Adjustable J&M Products The Testing:

We built a fixture which simulated a factory control arm mounting and tested how much force was needed to make the control arm articulate (twist) in those mounts and the results where astounding.

Poly-Ball Bushings:

• 5 degrees of total rotation = 26.1 foot/pounds of torque
• 7.5 degrees of total rotation = 35.8 foot/pounds of torque
• 10 degrees of total rotation = 41.7 foot/pounds of torque

Standard 2 piece setup using only 85 durometer bushings:

• 5 degrees of total rotation = 124.7 foot/pounds of torque
• 7.5 degrees of total rotation = 156.4 foot/pounds of torque
• The 1/2″ grade 8 bolt twisted in half at 9.2 degrees which was 210 foot/pounds of torque

Fits: 1999 2000 2001 2002 2003 2004  Ford Mustang (except IRS Cobra)