Rockcrusher diff cover

[tiiiiim]

PS. I only got 1 warrenty car for 2 diff covers. got a spare one ?

[MRGC]

Mine is a D30 it goes in halfway, but will be replacing it with a magnetic sump plug when I find one before installing.

[Breyten]

Just checked both of mine, uncleaned, unpainted. finger tight the D30 has about 2 thread left and the D35 about half of them exposed.
Maybe an issue the foundry does in the design but the rest dont know?

I'm not fussed ATM, will just use thread stop and proper tools to max torque it in.

[Steve F]

Ok I just checked 6 covers, why, well because I have 6 covers unfitted at the moment and this seems to be one of 'those' topics that maybe needs an answer.

I checked 3 D44s and 3 D30s. First thing I noticed is that none of the plugs went in more than a few threads finger tight. So I got the tools out, bear in mind none of these covers are fitted and were just sitting on a box so I couldn't and wouldn't lean on the tools to do the plugs up.

The D30's all went flush with the cover, the threading on the D30 cover goes all the way through, the area the plug mounts is thick but no thicker than the plug. The thread is tappered and there are the same amount of threads cut in the cover as there are on the plug. I think if I really really leaned on the D30 plug I could get it to go below flush but there is no need for that. This cover is my personal one so I tighted it bit harder than the rest as they are not mine and I dont want to risk damaging them however unlikely. All the D30 covers the plug would go flush.

The D44 the plug would also only go in a few threads finger tight and was tighter with a tool earlier than the D30. A quick look showed why. The D44 (and I'm assuming the D35) has a much thicker section around the plug hole. Again the thread is tappered and cut to the same amount of threads as the D30 but it does not go all the way through the cover. Because of this the plug hits a tighter thread section earlier and wont go in any further, it doesn't run out of thread but it is like the end of a tapped hole where the thread is not cut so deep. I dont really see this is a problem as it still goes in plenty of threads.

Here's a couple of pics to try and show what I mean.

D44, Plug rest on a cover


D44, Plug in same cover, lightly tightened


D44 plug hole, not tapped all the way through the thicker mount. Note the thread needs cleaning.


D30 plug hole, thread all the way through. Not such a thick mount area.


Anyway, make of all this what you like.

Cheers
Steve

[MR EXTREME JEEP]

I dunno but those 2 threads dont look the same to me. May be the pic but top one looks coarser.

[Steve F]

Originally Posted by MR EXTREME JEEP

I dunno but those 2 threads dont look the same to me. May be the pic but top one looks coarser.

Not sure of the relevance but I checked anyway. The D44 and D30 are exactly the same as far as I can tell by eye. Both plugs fit both covers and go in the same amount. I tried 2 D30 and 2 D44.

And fo the hell of it here's a pic of the plugs as it was easier to get them side by side as opposed to the thread pics.



Cheers
Steve

[Rodgebone]

i checked mine unpainted so that was not an issue (and they are both still uninstalled)...as Breyton states i am not too worried as it goes in 2/3rds of the way so with a little extra tightening and thread sealer it should be fine...

MRGC, not sure why you would want a magnetic plug on the fill...it will hold metal particles closer to the ring gear whereas a magnetic drain plug tapped into the bottom would be more appropriate (ill be doing that eventually)

tiiiiim: I have tryed both the plugs on the D35 cover and they both only go half way.
So by elimination its the tread throught the actual cover. not the plugs.

I beg to differ with tiiiiim simply because i mic'd both plugs and there was a difference. you obviously have two plugs the same size whereas mine are definitely not...i spoze id chalk that up to the manufacturing process where consistency isnt up to snuff (however i am very happy with the product despite this...being an old mechanic i am used to this sort of thing happening...and it happens all the time in the automotive world)...