about to install NP-241 SYE, entire rebuild while I've got it apart?

[scorpion]

I'm gonna install a JB Conversions SYE I ordered and now I'm wondering if I should throw caution to the wind and just rebuild the whole thing.  JB sells the remainder of the install kit for $200 and a new chain for $150.  Obviously no one can tell me if I need to or not without seeing inside.  I do know the T-Case came from a forestry suburban that likely had a few miles on (though I have no idea how many) and that the previous owner stated it shifted between gears nicely the last he drove it.

If I find parts that have failed, I realize I need to replace them.  Is there any stated mileage recommendations surrounding the chain and/or internal bearings or T-Case itself?  Does it make sense to anyone to just do a full rebuild?  Half of me thinks I just swap the SYE and see how it goes but it would be so much easier to do the full rebuild while it's already apart so the other half can totally justify the $350 in parts.  If there's a recommendation to do the chain or bearings after 150k (as an example), that alone may just help me answer the question.

Thanks.

[Jason S]

My $0.02:
Being that you don't have full knowledge on the history of the t-case and since it is already out, I lean toward going through the case and checking/replacing bearings, chain, etc. At the least it should give you 100K + miles that you wouldn't have to worry about it; at the most it will save you from having to pull the case back out to do any repairs in the near future.

[scorpion]

My $0.02:
Being that you don't have full knowledge on the history of the t-case and since it is already out, I lean toward going through the case and checking/replacing bearings, chain, etc. At the least it should give you 100K + miles that you wouldn't have to worry about it; at the most it will save you from having to pull the case back out to do any repairs in the near future.

That's kinda what I was thinking and certainly the way I typically look at things.  I guess I already knew the answer but was having a moment of tight-wad.  Thanks.