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I picked up a Atlas II out of a 89 XJ that had a 21 spline input I am putting it in my 99 XJ I am aware of the 23 spline output I have on my Tranny.And have to buy a new input gear from AA. What I am wondering is the case currently has a spacer to adjust for a long out put on the 21 spline AW-4 does anyone know if the 23 spline AW-4 will require the same spacer or not?