1989 c6 automatic. it is on an 1989 F350 dually with 7.3 idi engine. the tranny was rebuilt about 3 years ago and just developed a severe leak and losses about 3.5 quarts of fluid in about 75 miles distance. shifts on schedule and pulls good. is the front seal the only seal to stop this leak, or in there another internal seal in the pump that would cause this leak? thanks for any info on this.