We went 200 miles because that’s how far we needed to go. Could have gone much further. We never had to add trans fluid, the soap just sealed it right up. We were camping in the desert and ran over a road sign that someone left in the dirt, it tipped up and cut a nice 3” slice in the pan. Old timer in camp saw us struggling with it and said “get you a bar of soap”. We laughed and tried everything else we had first, Nothing worked. Then we tried the soap and made it home.