hey guys, been busy with thanksgiving and all.... I know the rear is just a bolt on part, but do any other mods need to be made, or rather, when you guys did it, are there any other parts, (seals, shafts, etc.), that should be replaced, attended to etc... thanks again.......also what oil would be recommended..... at work we use Mopar 75-140 synthetic... seems to be really good oil, that's what I've been using presently..