The bearing block for the rear diff is a belt tensioner, you should have two sets of bearing blocks with A and B on them.
A - with arrow pointing back - rear belt tightest
B - with arrow pointing back - rear belt tight
B - with arrow pointing forward - rear belt loose
A - with arrow pointing forward - rear belt loosest
I run my xx4 with the belt tight, B blocks with arrow pointing back.
Try changing the diff and centre pulleys when you fit a new belt.
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