Here is a picture of the differential on my dad's 1983SD, I am confused as to which plugs must be removed to fill/drain the fluid....I was thinking that "B" is the upper plug, and that "C" is the lower drain plug....am I right? I got confused because I saw the foreign object "A" up at the top and I don't know what that is. So which ones do I use? This diff is begining to whine and is a 3.07 with almost 258k on it....probably neglected by previous owners as well, I don't even want to know what the fluid (or whats left of it) looks like Plus as you can see in the picture the whole bottom half is coated with a sludge...which I hope is not leaked out fluid Also, what size Allen Socket is this? 12mm? or 13mm? I only have a 10 and I can see that its quite a bit too small....

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__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

A is the vent.
B is the fill plug.
C is the drain.
Do not remove C before B.
14mm.

14mm hex wrench, and those plugs are probably reeeeeeal tight.

__________________
Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE

Tight is probably an understatement. I ended up swinging a 10lbs sludge hammer against the 14mm hex wrench to get that bad boy out. And that was after pulling every muscle in my upper body trying to muscle it out.

__________________
Adam Lumsden
(83) 300D
Vice-President of the MBCA International Stars Section

Thanks! Yeah I'll probably use the breaker Bar with a 14mm allen socket

I hope they come out, we got a few quarts of Mobil 1 synthetic 75/90 stuff to load them up with (both cars). So far I've never not been able to get a bolt out of either of these cars with enough coaxing and lots of pulled muscles.....always had success after a while...

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

I never heard of one that absolutely couldn't be removed, but sometimes it's pretty brutal. Be careful not to pull the car off the jackstands.

__________________
Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE

I was doing it with the car driven up on a progressive pile of stones and pieces of wood Makes for a very solid base.... Step 1: 12cm thick block of concrete about .5 meters long, Step 2, 3, and possibly 4: Pieces of wood progressively getting higher. I end up with the car sitting on a stack of thick pieces of wood on a block of stone, so the car is as sure footed as if it were on the ground, then I chock the wheels.(the front ones, with steel chocks) For other stuff I use the jack stands and hydrolic jack.....but the small stack of stuff gets it high enough for me to work under there comfortably.....

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)