I was replacing my fuel filter this afternoon on my wifes '06 Expy. This was the first time I was under it since getting it late last summer. So when I was done with the filter I was looking around underneath just to get the lay of the land. I saw something that didn't look right. It look like I am missing a plug or something. I took a couple of pics of it and put red circles around the area that I am questioning. I looked up the whole and could see something that looks like a gear. So please let me know if I am missing something and what the gear thing is. Thanks for your time.

 

flywheel. probably should have a rubber plug there.

 

Looks like the inspection hole for the flywheel teeth like Dporter said, awfull rusty in there.

 

on my 2002 nav there is a rubber plug there that allows you to turn the torque converter to its drain plug allowing you drain the torque converter on fluid changes

 

Verrry inneresting!!! My 2002 Navigator has the rubber plug but doesn't have a drain plug in the converter.

 

Its not a deal if this piece is missing, all of these transmissions have them even if yours does not have the actual drain plug in the TC.

 

It is supposed to have a plastic plug there. All of the 4R70 trans have it and I believe the 4R100s do too. I suggest picking up a plug from the dealer or almost any transmission shop should have a few laying around from some old cores. It is also to keep dirt and debris out of that area. There should also be a plug in the hole of the block opposite of the starter for the same reason

 

Not a big deal, as stated above just pick up a plug. A quick trip to a salvage yard, dealer, trans shop and you'll be set but don't lose any sleep over it!

 

I would suggest making it a small deal though, as road salt and other debris like sand and dirt will get in there and attack the seals. Once the seals start leaking it becomes a BIG deal.

 

Good point!!!!!!!!!

 

Will probably stop by the dealership on the way home from work tomorrow to pick up the plug. When I get the plug should it do anything before replacing the plug. Should I spray some lube or oil up there? Let me know what i should do before sealing it up.

 

Just push it into the hole until it clicks/seats and all is good.