Dana 70 Rear Maintenance - Dodge Cummins Diesel Forum
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post #1 of 12 (permalink) Old 07-19-2014, 07:16 PM Thread Starter
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Dana 70 Rear Maintenance

So my rear end is gonna get some work done. Im planning on putting in some 75W-140 Syntheic Royal Purple oil (How much does it take?), It's limited slip so im guessing i need friction modifier? (How much do i need and how do i add it?), and a new gasket for the cover. Anything else i should do while im in there? Things to look for? The reason i'm doing work on it is because the rear end seems to kind of "catch" mainly while reversing slowly and/or turning slowly, sound like the diff oil? Or maybe somebody didn't add friction modifier or did it wrong before? Thanks for the help guys, this is my first time cracking open a differential cover.


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post #2 of 12 (permalink) Old 07-19-2014, 07:50 PM
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Really nothing to changing the fluid. That catch in mine was a broken tooth on a spider inside the limited slip. So good luck inspect it well

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post #3 of 12 (permalink) Old 07-19-2014, 08:02 PM
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D70

According to my 2002 factory service manual the D70 rear axle gets 3.1 L (6.5 pts) for the 2wd & 3.4L (7.2 pts) for 4wd with 7oz/8oz respectively of friction modifier. No gasket used on the turkey pan cover, just clean thoroughly and rtv it. Confirm the amounts match your specific application. Hope this helps

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post #4 of 12 (permalink) Old 07-19-2014, 08:19 PM
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Royal purple already has friction modifier in it so no need for extra

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post #5 of 12 (permalink) Old 07-19-2014, 08:25 PM Thread Starter
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I found a gasket online though, wouldn't that be better then just using rtv?

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post #6 of 12 (permalink) Old 07-19-2014, 09:45 PM
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Gasket

I guess it just depends on much you enjoy scraping old rtv off, either should seal fine assuming the gasket is the correct materail. I have a Mag-Hytec cover with an o-ring seal, 1 extra qt of oil and a drain plug which eliminated all these issues.

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post #7 of 12 (permalink) Old 07-21-2014, 06:06 AM
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Look for metal in the bottom of housing. Look for play in pinions or roughness in carrier bearings. If you have something rough or "catching" You probably need rebuild. Plus check your u-joints.

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post #8 of 12 (permalink) Old 07-21-2014, 06:12 PM
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Took off my pan drained the oil and I used normal black rtv. Don't have to get crazy just spread it evenly

Be careful tho that rear end oil stinks like all hell try not to spill any! Learned the hard way.

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post #9 of 12 (permalink) Old 07-22-2014, 12:25 AM
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Quote:
Originally Posted by Diesel_River View Post
I found a gasket online though, wouldn't that be better then just using rtv?
No. Factory uses RTV type sealant rather than a gasket. This is because the metal is so thin, it very rarely has a perfectly even sealing surface. The RTV fills in the slightly different levels and creates a good sealing surface, whereas a gasket is a uniform thickness and cant compensate to the same extent for a sealing surface that isn't perfectly uniform. Clean both sealing surfaces well removing all the old RTV, and apply about a 1/8" bead of new RTV on the cover and reinstall torquing the bolts in the correct pattern.

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post #10 of 12 (permalink) Old 07-22-2014, 12:29 AM
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You can buy the gasket at any parts store.

99 2500, Quad cab, 4x4 47RE, BD pressure lock on it, small BD 90/140 chip on the VP 44 connection plug, 17" 3rd gen wheels. 3.55 diffs. Ruenell front bumper and warn winch, Rancho adj shocks. 663k miles.
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post #11 of 12 (permalink) Old 07-22-2014, 12:30 AM
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Quote:
Originally Posted by Spravecek View Post
Took off my pan drained the oil and I used normal black rtv. Don't have to get crazy just spread it evenly

Be careful tho that rear end oil stinks like all hell try not to spill any! Learned the hard way.
Stinks? I actually don't mind the smell of most oil. Also I forgot and left a coffee can under a leaking differential in a 1945 Ford pickup once for nearly a year. By the time I retrieved the can, it was half full of oil and had about 10-20 snails and frogs drowned in it. Must smell good to them.

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post #12 of 12 (permalink) Old 07-22-2014, 12:34 AM
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Quote:
Originally Posted by bigfish95971 View Post
You can buy the gasket at any parts store.
Yes, but as I just mentioned, from my own experience using both types with different vehicles, the gasket is more trouble than not. Since most manufactures use RTV type sealant from the factory on these differentials, there must be some science to it. It is cheap and easy enough to use if you are careful, but if not it can get messy.

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