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Is there any kind of wear on the driveshaft yoke where it passes through the seal when you slide it in? Maybe a groove worn into it where the seal rides? How much play is there in the shaft when it is slid into the rear of the trans? Can you grab it and move it up and down/ side to side a lot?
If the part that slides into the trans is worn or grooved you can maybe find a good one at a junk yard, or look through the phone book for a place that builds drive shafts, they can get you a new yoke often cheaper than the dealer. Also how are the U-joints? if the shft has excessive vibration from bad joints..or being out of balance it will ruin a new seal quickly.
If you find there is a lot of movement up/down/side to side, perhaps a bearing in the tail of the transfer case is worn.
Good luck
Zeeb
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