Sandrail IRS Conversion
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Alright, once the jig is made, converting a swingaxle to IRS is easy.  Our first need was to convert a sand rail.  I removed the spring plates and torsion bars and cut away the bracing that would interfere with the installation of the pivot.  

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I then assembled the jig and the inner IRS pivot and installed it on the torsion housing.
  The IRS pivot was welded in place and the jig removed.  The jig gets flipped over for the other side and the welding procedure is repeated.  If the IRS pivot is being welded onto a stock frame horn, the outside of the horn needs to be cut away to allow for the pivot to slip inside a little bit


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The rest is assembly.  Install the torsion rods and either the IRS spring plates, or the modified swingaxle spring plates.  Bolt on the arm and you are done.


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If you want to remove the IRS stub that is common on the stock IRS spring plate, the swingaxle plate can be used after simple modification.  A drilling and cutting jig can be made with a stock IRS spring plate, and a piece of cardboard, or thin sheet metal.  Trace the shape and hole positions from the IRS spring plate and trace onto the swingaxle spring plate.  Be sure to flip the pattern over on one of them since the holes are different from left to right.

The original holes are slotted to allow for alignment.  If the car is to be driven on the street, or there is a need for adjustment after installation is complete, then the holes can be elongated with a die grinder.   A trip to the alignment shop would be smart.


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Last updated: February 27, 2014.

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