Frequently Asked Questions

Our customers most Frequently Asked Questions

A-arm / Ball Joint install

  1. Bolts and nut tork spec
  2. Stud spins in steering knuckle
  3. Grease


Get live shipping quotes on JBA web site from Marlin Gehman on Vimeo.

Overseas shipments

  1. Yes, we ship our parts all over the world
  2. Get live shipping quotes on JBA web sites


Why Rear Bump Stops

Rear bump stops are need to keep the rear shocks from bottoming out on themselves and damaging the cylinders.

The best way to set up rear bump stops is to remove the springs and attach the shocks and then jack up the rear axle till the shocks bottom out. Then measure the distance between the factory bump stop and the bump stop pad. You need to fill the gap plus 1/2" to 3/4" to keep the momentum of the compression of the suspension from bottoming out the shock. So if the gap from the factory bump stop and the bump stop pad is 2" mount a 2.75" bump stop on the factory bump stop pad to hit the factory bump stop. This will keep the shock from hitting its self and destroying the cylinder internally.

Lifting a Jeep Grand Cherokee WK

Plan your build & work your plan.

Please take your time to read and understand what you can and cannot do with the Jeep Grand Cherokee WK (2005-2010) in our ultimate WK/XK lift kit resource.

Start with your budget and then look at what you can do with that size budget.

To many people start with the wheels and tires and end up with an expensive cluster that does not work the way they would like.

Save yourself a lot of time and money by starting with a plan.



Installing a OME lift kit on a Jeep Grand Cherokee (WK) with JBA upper control arms.

Install video for the JBA-7.0.HC

Toyota Tacoma 2005 Plus, 4Runner 2003 Plus, FJ Cruisers 2007 Plus, Lexus GX470 2003-2009, Lexus GX460 2010 Plus.

Whats the difference between the JBA STD and JBA HD Toyota UCAs

JBA STD Toyota UCAs for the Tacoma, 4Runner & FJ Cruiser VS JBA HD Toyota UCAs for the Tacoma, 4Runner & FJ Cruiser

First I will start with the STD (standard duty) a-arms, they were designed for the weekend worrier who worked hard all week and wants to play hard on the weekends with his Toyota.  The JBA UCAs will give you 1" extra down travel on the front suspension with more ball joint travel and strut spring clearance.

JBA Tacom upper control armsJBA STD Toyota a-arm

The JBA STD A-arm tubing is 5/32" wall and 1" dia. with a Moog style K6292 ball joint. On the JBA HD (heavy duty) A-arms are thicker tubing, with 3/16" wall and 1-5/16" dia with 11ga guests on the bushing bongs. The HD a-arms are for more extreme offroad abuse like offroad racing, rock crawling and dune jumping.

JBA UCA with Fox CoiloverJBA HD Toyota a-arm

JBA Upper Control Arms with Fox Coilover

Both STD & HD will work with the Fox extended travel coilovers and the JBA Coilovers.

If your steering knuckle is reinforced get the JBA HD a-arms.

If you jump your Toyota you need the HD a-arms, If your steering knuckle is reinforced with a weld on gusset you need the HD a-arms.

The Ball joint range of motion
Up travel is 40 deg off of center line of the ball joint, down travel is 50 deg off of center line. Full range of motion is 90 deg. Note: you will not get that kind of extreme travel with a uni-ball joint


More spring clearance is
More suspension travel
More articulation, See JBA vs Uniball 
More traction on the trails
More Caster
JBA UCAs give you MORE for your money!!

In conclusion the JBA STD a-arms are for a daily driver/weekend worrier the JBA HD a-arms are for extreme offroad use.

The JBA Upper A-Arms, upper control arms (UCAs) were designed for your lifted Toyota Tacoma "05" Plus, 4Runner "03" Plus, FJ Cruisers "07" Plus and will directly replace your stock upper a-arms. The original equipment a-arm (UCAs) hits the spring,  on Toyota Tacoma with a lift kit. The JBA A-Arms are compatible with all the lift kits on the market today! These A-Arms (UCAs) were designed to fit Toyota Tacoma, 4Runner, FJ. Made of heavy duty tubing, red powder coat finish, with replaceable ball joints. The A arms (UCAs) are assembled and ready to bolt onto your Toyota Tacoma, 4Runner,  or FJ.

Sold as a set, 1 left & 1 right UCA.

Both HD and STD UCAs will give you more caster!

Toyota Tacoma Caster with JBA UCAs