Lowering can /will make a difference
Take a measurement with the truck loaded with weight on it and with the rear end hanging at full extension. (measure from the yoke to the rear of the tranny)
You will want to have at least 3/4 to 1 inch away from the bottoming out of the tranny output shaft to the inside of the slip-yoke


There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!