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how can i dyno an AW4 XJ

Best is to lock it in 3rd which is 1:1. You will need some type of manual trans/TCU controller. What year do you have?
 
Unplug the TCM. You can reset the CEL after the runs. Without the TCM in place, the transmission should not shift out of third. You can check out the :Everything you wanted to know about the AW4" thread for the details.

IMO, this should work. Without the TCM, the transmission should not down shift.
 
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