Performance Suspension System 7
These systems use two shocks at every corner for increased handing and body roll control. We also include many of the extras which are optional on the lower end systems. These systems are the REAL complete systems. They are at home wherever you choose to use them from street to heavy four wheeling.
: 1976-1977 Broncos require a two inch body lift to use this system!
Includes front coils, 14 pc. front end bushing kit, front bump stops, drop pitman arm, front shock hoops, front brake line, rear brake line, rear 11 leaf pack springs, rear spring and shackle bushing kit, U-bolts, 8 Extreme shocks with boots, rear shock mounts, rear bump stops, rear bump stop mounting plates, right and left E-brake cables.
The System 7 is pictured with the stock diameter U-Bolt Kit and the optional Shock Jock Rear Shock Mounts.
Watch Your Caster Angle
The caster angle is defined as the number of degrees backward (positive) or forward (negative) of the tilt of the king pins (Dana 30) or ball joints (Dana 44) in relation to a vertical line through the center of the front end.
Caster correction on lifts over 3.5"
These are our observations from years of building early Broncos. We know there are always exceptions to the rules, but we have noticed about 90% of Broncos with wandering problems are the result of incorrect caster. The specification for Bronco caster is +4 to +9 . When the Bronco is lifted, the caster will move in the negative direction. Properly installed degreed C-bushings will move the caster back in the positive direction. Because of the caster issue about 50% of Broncos going to a 4.5" lift and most Broncos going to a 5.5" lift will need more caster correction than the standard 7 degree C-bushing. The additional correction can be addressed in a number of ways. These three are the most common.
1. Radius arm drop brackets: Only drawback with this method is the unavoidable loss of ground clearance.
2. Long radius arms: This is the most common method of correcting caster on taller lifts. Advantages include maintaining ground clearance, additional articulation off-road and improved handling.
3. Bending the stock radius arms: We know this is old school, but long before degreed C-bushings people were lifting Broncos and bending the stock arms to achieve good caster.
WE RECOMMEND upgrading the stock diameter U-bolt kit included in this system to our Extreme Duty U-Bolt Kit for only $50.
The force and stress placed on stock components by off-roading is enormous. We noticed that we were bending the stock u-bolt plates so we set out to build some that could take abuse. We also noticed the stock 1/2" u-bolts are pretty weak. It may seem kind of simple to take a piece of thick metal and drill some holes. We have seen those types of plates. The problem is the edge of a plate like this causes a ridged pressure point and can cause the spring to break at that point. We invested in tooling that routers the edge of our plates. In doing so we are able to keep a stock type edge which compliments the spring when it's articulating.
These are a must have for trail runners and rock crawlers. Keep your rear axle and springs mounted solid!
Select between the regular stock style rear double shock mounts or our new "Shock Jock" rear double shock mounting system which is the result of listening to customers who wanted a long travel rear shock mount that maintained stability while not cutting into the interior space of their Broncos. The design of the Shock Jock maintains stability by mounting the shocks outside the rear springs. The upper Shock Jock mounts are a one piece laser bent and welded ¼" steel design. The thing that most sets the Shock Jock apart from other rear shock mounting systems is flexibility.
- The upper mounts can be bolted or welded in place (lower mounts are weld in).
- The upper mounts can be installed in the forward or rear facing position.
- You have the choice of mounting regular or rod end style shocks.
- Sheet metal trimming is optional.