i've got 904 transmission overhaul kits sitting around, still in the box and wrapped in plastic. Not sure how old,but the labels are the blue,white and red logo. These still useable, or just conversation pieces? never opened so i'm not sure if the seals are soft,flexible. is today stuff much better?

I'd open one up & see what you see as a good visual always goes a long way but I wouldn't be afraid to use one. I'm sure seal/material tech/composition has improved but I think you'll be fine. Sell me one & it's going into a stock car so I'm not worried

I use to buy allot of the genuine Mopar trans kits from Mancini Racing, they are decent quality & in the late 90's they were around $65-$70 & included the steels & the front band.... Open them up & have a look... Unless they got wet they are probably fine...

as long as it was dry and never damp or wet u should be golden...

The rubber seals start to harden with age, even in ideal storage conditions.

ya true..seal kits are availiable.. i have a few sitting around and used a few old kits with good luck..