If you have a shop do the repair work you might be faced with a tough decision. They could find some real issues leading to the need for a complete rebuild. If so you will then be commited to it because your rig will be in their shop. Best to go in prepared for the worst. Before you go in you can do some investigating of your own. Pay attention to tranny noise in all gears. Does one gear make more noise than the others? Is it hard to shift into first? Does first ever grind. If the synchros are shot then big $'s. Another thing you can do is crawl under there and grab the drive shafts up near the transfer case. Give them a shake. If there is alot of movement then the output bearings are shot. With this knowledge you will be armed and ready to go in and have a talk with the shop before commiting to the work. The less surprises the better I say.
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