2039 - 1982-2002 GM F-Body On-car Adjustable Control Arms- Poly/Roto-Joint 1999-ford-f-150-esi4281697 enhancing handling and performance compared

enhancing handling and performance compared to factory rubber and aftermarket bushings

but too much slipperiness causes excess wheel spin

while wide shoulder blocks deliver confident cornering performance

increasing traction

2039 - 1982-2002 GM F-Body On-car Adjustable Control Arms- Poly/Roto-Joint 1999-ford-f-150-esi4281697 enhancing handling and performance comparedSpanner Wrench This spanner wrenched is used for adjusting and disassemble of Roto Joints used in all UMI Performance products. Over time if the delrin race inside the Roto Joint would wear the spanner wrench is used to tighten the adjusting ring applying more pressure to the delrin inside. The spanner wrench is also used to disassemble the Roto Joint for cleaning, inspection and rebuilding.