Ok I need to do my rear main seal and I have never done one on an Idi,i just let it leak no biggie.but my boss told me he is tired of seeing my parking spot rainbow colored. I have only done one I'm my life and it was on a buddies jeep several years ago.any advice is appreciated.

 

You need to pull the trans and flywheel/flexplate. There is a cover on the back of the block that comes off, the seal is in this cover. Pry the old seal out and tap the new one in. Keep in mind the one I put in mine should not be lubed, it is a teflon seal, there is a thin plastic sleeve that comes with the seal, this must be placed over the crank as the seal is slid over so you don't damage the seal. Also check your crank and make sure the new seal doesn't sit in the groove (if there is one) of the old one, or it will start leaking again. If it does just do what I did and tap the seal in a little farther so it sits on a new spot on the crank

 

Personally I'd make the boss change it! lol

 

Haha you tell him, by the way he is a captain (O-6) in the USCG. Do I need any special tool (s) before I start? I am just guessing but I need to get a transmission pan gasket too, to drain the tranny fluid should I do any gaskets or anything on the transfer case while I have the it out?

 

Good metric sockets to get the crossmember out, a trans jack willmake the job alot easier, drop the trans and x-case and roll it clear, do the seal and roll it back and lift it up. the top bellhousing bolts are alot easier to get at IMO from the top.

And as far as the x-case seals, if they ain't leaking leave them,the 1356 you have is rather easy to change seals in if they ever do start leaking. But make sure the vent isnt plugged and you should be ok.

 

Great thanks for the info sounds simple enough. By the way my first diesel was a 84 6.9l I lived that truck!

 

Mine was built in 83 as an 84 I still have the international harvester decal on the valve cover

 

There is a seal that ford sells that comes with a sleeve as well. It has an install tool as well. The sleeve covers any groove in the crank so you don't have to worry about that. Thats the way I went at least.