trany front seal question

Steve, the first thing I'd do is verify what is actually leaking. Just because ATF is coming from the front seal area doesn't mean it's the front pump seal that's leaking. I've seen the pump to converter seal leak, the outer pump O-ring leak, the torque converter develop a small crack and leak, and the pipe plug in the lower part of the bellhousing leak. Also seen the dipstick tube o-ring leak and run down the bellhousing making it appear the front seal was leaking.

As for additives. Their the last thing I'd consider. All they do is swell up the seals. Notice I said seals (plural), not seal (singular)? That's because it'll do it to every seal in the trans. shortening their life. I know R&R'ing a trans. sucks but do it right.