Rear Differential Fluid Drain...Need Help - Dodge Cummins Diesel Forum
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post #1 of 66 (permalink) Old 02-28-2019, 02:08 PM Thread Starter
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Rear Differential Fluid Drain...Need Help

Need some quick assistance, although I'm afraid I know the answer.

I've got a 2014 3500 up on blocks and was going to change the rear end fluid. Took out the filler bolt. Took out the lowest bolt of the differential cover and expected oil to drain from that hole, however nothing came out. Do I need to completely remove all of the cover bolts and pry open the cover to get the fluid to drain? Will that ruin the gasket? (I do not have a replacement gasket).


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post #2 of 66 (permalink) Old 02-28-2019, 02:11 PM
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You will have to Pull the cover. The gasket if there is still one in there is reusable from the factory.
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post #3 of 66 (permalink) Old 02-28-2019, 02:12 PM
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You need to remove the cover itself. The gasket is reusable.

That bolt you removed is the Fill Hole.

A word of advice about replacing the Bolts, manual calls for 30 lb ft of torque.
- It seems a little high for these bolts, especially if the threads are wet.

Clean off the old RED loctite and replace the bolts with Blue. Use common sense when tightening this bolts in a star pattern.
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post #4 of 66 (permalink) Old 02-28-2019, 02:14 PM
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Yes, removal of rear cover is required.

You can loosen all bolts. Then start removing bottom ones. Gently pry cover on bottom when most all bolts out

The gasket maybe reusable. If its metal with RTV lines. Or you can buy a new gasket. Or you can just use RTV.

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post #5 of 66 (permalink) Old 02-28-2019, 02:35 PM Thread Starter
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Thanks all. I've got all the bolts out.
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post #6 of 66 (permalink) Old 02-28-2019, 06:01 PM
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Be sure to use a clean rag to clean both sides of the gasket and the mating surface of the diff cover and axle prior to reassembly.

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post #7 of 66 (permalink) Old 02-28-2019, 07:34 PM
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Might as well check your gear pattern.
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post #8 of 66 (permalink) Old 02-28-2019, 07:35 PM Thread Starter
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Thanks for the assistance and advice. All done. No apparent leaks.

Next time I will not take out any of the differential cover bolts. Will just back
each of them out 1/8 inch and let the fluid drain through the gap
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post #9 of 66 (permalink) Old 02-28-2019, 09:23 PM
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If you develop a leak or next time it doesn’t work out for you, I would just buy a gasket. The rtv works, but if your ocd like me your down and out for a day. The directions for the stuff I used stated to put it on the cover, hand tighten the cover onto the differential, then wait 10-15 minutes before torquing it down. Then you were suppose to wait (I believe) 24 hours or so before filling up the differential with fluid. I’m sure a lot of people get away with not following the manufacture directions. But for whatever reason whenever I try to take a short cut, I always regret it and something happens. Anyways long story short a gasket in my opinion is the only way to go. Plus when you have to do the job again it’s a lot easier to get the gasket off than rtv sealant.

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post #10 of 66 (permalink) Old 02-28-2019, 09:30 PM
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Quote:
Originally Posted by Hotel California View Post
Next time I will not take out any of the differential cover bolts. Will just back each of them out 1/8 inch and let the fluid drain through the gap
Why? It doesn't take many seconds extra to remove the cover.
With it off you can inspect the gears and see if things look good in general.

Besides, how did you plan on cleaning off the sealing surfaces with an 1/8-inch gap?
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post #11 of 66 (permalink) Old 02-28-2019, 09:47 PM
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or just invest in a new cover with a drain, then never have to take cover off, unless you wish to inspect things?

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post #12 of 66 (permalink) Old 02-28-2019, 10:12 PM
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Quote:
Originally Posted by Jimmy N. View Post
Why? It doesn't take many seconds extra to remove the cover.
With it off you can inspect the gears and see if things look good in general.

Besides, how did you plan on cleaning off the sealing surfaces with an 1/8-inch gap?
With the oem reusable gasket, it will seal right back up without cleaning the gasket surface.

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