How too and Parts list for converting your IRS Upper Control Arms to Double adjustable:

 

You take full responsibility for this modification and while I believe it to be plenty strong, It has not been verified.

 

Part #’s

·        QA1, Phone # 1-800-721-7761, 2 x Part # ADJ12-12, ¾ 16 Double adjuster.

·        2 left hand thread jamb nuts for the double adjuster to thread insert interface.

How Too:

NOTE!!!  This measurement is for the Pin Drive IRS.   If you have standard IRS, DO NOT CUT TO THIS LENGTH!!!

We cut ours at 5.1 inches from the inside of the spindle mount hole.  See picture above.

 If you have the standard IRS, you would need to add 2.5”s to these measurements.  Just to be sure, I also recommend double checking with your current control arms before cutting.   Your are responsible for your cut!!

Drill the arm so that you can weld through the hole into the insert for extra strength.  We used a 7/16th bit.

The arm needs to be welded by a competent welder.  The Thread inserts are 4130 steel and the arms are mild steel.  Also, it may be necessary to press the insert into the upper control arm as it is a tight fit.  Clean up the weld and paint the tube insert and welded area.  The threaded inserts are steel, so they will rust if not painted.

Assemble as above and install in car.  Note: You need 2 jamb nuts per arm, and you should make sure the thread exposure is the same for the double adjuster and the heim.

Finished product. Make sure to tighten your both Jamb nuts after you have set your camber.