I just bought an 88 4wd Mighty max and I'm wanting to service the differentials, trans, and transfer case. Forgive my ignorance on this. How do I determine if my truck has a limited slip rear differential or not, so I know which fluid to use? Also is synchromesh appropriate for the transmission? I apologize if this has been gone over already on the forum, but I was unable to find this information. Thank you in advance.