Tranny leaking fluid after about 30 miles

[Retrorocketeer]

I have a '92 Eddie Bauer 4x4 auto V6 with 140,000 miles. I have had the truck for about 6 years and it has been sitting for the last 4 years. I drive it about once every 3 months or so. The last 2 times I have driven it, the transmission will start leaking after I drive it for about 30 miles (after it gets hot). It leaks from the front of the bell housing. Would a fluid cooler and a fluid change help or am I in need of a tranny? The fluid is brown and I have never changed it or the filter. I have probably put about 40,000 miles on it since I have owned it. Any help would be greatly appreciated as I am trying to sell the truck but don't want to sell it with a bad transmission nor do I want to put a new transmission in it since they are not worth much to begin with.

 

[boggs1227]

idk if changeing the fluid will help the leak ....front seal has let go .it will have to be dropped and a new seal installed.maybe if you fix the seal and change the fluid / filter it would be able to sell then for more money than a truck with a shot drivetrain.