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For me it looks advisable to have this "anchor" tool to help with the installation of the countershaft. It's like a shorter version of the push-through bar and helps to take all these rollers at their place.



No tool necessary. Use a light coating of wheel bearing grease to hold all the rollers in the countershaft cluster. Then install the shaft. Same for the thrust washers - use a light coat of grease to "glue" them to the case while you drop the cluster in.

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Also want new thrust washers for the countershaft, they have metal pieces pressed into the lining.



Do they really need to be replaced? I've done a few cases and never had a set worn enough to need replacing.