[Spits] fixing transmission leak?

[s1500@comcast.net]

So ever since I rebuilt my transmission, it has been taking longer & longer to 
engage the overdrive. This means it has been low on tranny fluid. A fill-up 
fixes it, but I want to fix the root cause. When I did a tranny rebuild, I 
instead used my own cut gaskets & sealant instead of the thin paper gaskets. 

I'm wondering if I messed up somewhere. Is it difficult to fix said 
transmission leak without having to take the transmission out again? I feel 
dumb not checking this before putting it back in. 
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