Auto tranny leak

[sixkill]

I"ve been using a lot of ATF lately, so I decided to pull it in the garage and chase down the leak. Well, not so easy. It looks like it's coming from the left side where the cooling line hook up. I removed all of the evidence and brought it up to the full line. I the ran it at high idle in nuetral for twenty minutes. Not a drop So the I idled it in drive and waited and watched. Nothing. Then I put in reverse for a while I lose about a quart and a half per tank of fuel now. It's all over the side of my truck and the tailgate not to mention the undercarriage. It has refused to leak standing still for the third time now, but it will leak cruising down the road. I have installed BD's X converter, pressure lock and valve body. I have also replaced the troublesome factory lines with dayco push-on hose and fittings. (They do not appear to be bad. The hoses are not cracked and the fitting are tight.) The side of the transmission is clean and does not appear to be cracked. The pan isn't leaking (it doesn't leak without engine running) I don't know what else to do but ask the fellas and see if anyone has had a similar problem and can point out a solution. Thanks