I think it would work. If your not sure you could try it out at home and see how it goes. I defenately would not over fill it.
Maybe you could look into some recipes for Bavarian Cream....it's a pudding filling that I think tends to be thicker. It's easy to make and you can make different flavors. I use this as a filling alot.
Chrissy.....working on drinking her coffee for the day 
I made a cake for my mom using pre-packaged chocolate pudding as a filling. I didn't get to try it myself, but my mom described it as "delicious". Her other description was "verrry moist". I prepared the pudding per directions on package. I wonder if it would work better just to use a bit less milk?
I use the box pudding mix also - but instead of using 2 cups of milk, I only use 1.5 cups. Accidentally used 1 cup one time and had a very thick yummy filling!
~Chelle
I have used it in the past also. The one thing I can say is it's best to use on a cake that will be eaten right away, because the longer it sits the more the pudding soaks into the cake and eventually you are left with a very moist cake (not a problem) but the filling is mostly gone! Very yummy though! 
Another great way to use boxed pudding mix is to whip it with 2 cups heavy whipping cream, makes a great "mousse!" I do that with the cheesecake pudding mix and wow is it great!!
I have also used the pre-packaged pudding, the vanilla with added sliced fresh strawberries is fantastic! Just don't use too much and chill well!
Tracy
It makes a great filling, very mousse like. It will not soak into the cake. I just made a strawberry cheesecake filling like that last night for my WASC cake. I whipped the cheesecake mix and heavy whipping cream all up and added a bit of Strawberry preserves-yum!
It really holds it's shape well but remember you do need to keep it chilled!
Tracy
do you think a powdered mousse mix would work? i bought three boxes and i thought it would make a good filling.
thanks!
tthardy78, I use the snack pack pudding and add the instant pudding dry mix to the snack pack to make it thicker. Its really Yummy. So my recipe is 3 vanilla snack pack puddings then 1/2 package vanilla instant dry mix, stir it up really good. Ive used this for years! Kind of like a thick custard texture. Good luck!
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