Had some IFS diff work done years ago on a 1990 4runner and the truck has been sitting. The problem is an oil leak on the drivers side. A Spartan locker was installed in the carrier and at the same time I had the older one piece axle and matching tube installed to replace the ADD crap, I supplied the diff pumpkin seals X2 but am wondering is A/ he installed the seal too deep or B/ did I miss an outboard seal. I did not do the work nor see it done.