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Renix AW-4 Transmission Swap into a YJ
'87 XJ AW-4 into '93 YJ

By Shad Ahlstrom



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I cut an appropriately sized hole for the tail shaft of the transmission in a piece of stiff cardboard. I shoved a marker in one of the holes from the back and ran the cardboard by it. This gave me the diameter. I poked a hole in the cardboard at a point along the line and placed the tip of the marker through.
 

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I ran the marker in a circle around the back of the transmission.  I measured the distance from the edge of the existing hole to the punch mark very precisely.
 

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I used a punch at the place I wanted the new hole.  I used that measurement to place a punch mark in the exact same place next to every existing hole.  I drilled an 1/8" pilot hole and rechecked my measurements.
 

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I then drilled them to 7/16".
 

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I slid the transfer case back on and bolted it down. Perfect fit.

 

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