I had a good teacher on these autos...my favorite brain teaser is the AOD fully hydraulic OVERDRIVE valve body...
One clarification on this Allison failure, this transmission is from a 4x4 and the needle thrust that failed is smaller in the earlier version of the 1000 that has a transfer case hanging on the back end. The 2wd versions and the upgraded 4x4s have the larger thrust bearing in that cluster for the output shaft to ride against...





my favorite brain teaser is the AOD fully hydraulic OVERDRIVE valve body... 
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