I wouldn't go ordering a clutch pack yet. I said in your other thread it may be the clutch pack. You need to take the t-case apart and verify that as the problem.
If this is your only vehicle you could easily see what parts it needs and get it back together temporarily in a weekend with the rebuild thread that was posted.
I saw a price for a clutch pack when I was rebuilding my 4405 and it was either $120 or $150 I think. I could be wrong though, I did not need to replace the clutch pack.