LSD and me. - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 12-05-2009, 10:52 PM Thread Starter
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Exclamation LSD and me.

A couple of months ago, I changed out the front and rear differential oil. I used the recommended spec, sealed it back up, and... done.

Until today. I changed all of the brake rotors and drums, and while I was adjusting the shoes in the back, I noticed that when I spun one wheel, they both turned in the same direction. Having worked on a few old Broncos I used to own... this strikes me as odd. I was pretty sure they were supposed to turn in opposite directions. So, I start thinking about it and... lo and behold I clear enough dirt away to find the little tag on the bottom that says USE LIMITED SLIP DIFF LUBE ONLY. I'm an idiot, btw.

At this point, I know the obvious is probably to pump it out again and refill it with the correct lube, but, two questions for anyone who knows:

1.) Have I done any major damage running it that way for a few months? If so, what do I look for and what might I need to do to fix it? For what it's worth, I haven't actually 'noticed' any ill effects...but I'm not even sure how they would manifest honestly.
2.) Anyone here have an easily available reccomendation for the LSD rear diff lube?

You guys usually have the right answers to this kind of thing and have been a great resource and knowledge base, so I figured I'd throw this out there. As always, any help greatly appreciated.

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post #2 of 6 (permalink) Old 12-06-2009, 04:03 AM
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The same thing happened with my dad's 1/2 ton Dodge. He changed the rear diff fluid and told me soon after he was hearing a strange whining noise. I drove the truck and heard it also. Both rear wheels also would only turn together in the same direction. The odd thing is, it has a lim slip in the rear, and he filled it with 100% limited slip fluid...I immediatly drained cleand out and refilled the rear diff with standard fluid and put in lim slip additive. The truck drives fine, and the whine is very subsided, but the oil I drained did have lots of metal in it. I will be changing it again here in a few weeks when I go back home, and inspecting it again.

Hopefully in your case, since you caught it quick also, the damage, if any, is very limited.

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post #3 of 6 (permalink) Old 12-06-2009, 12:13 PM
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The oil should be the same all you have to do is add the limited slip additive in, some trucks like more then what is called for some need less but ether way we are talking a small amount most cases should be under a quart maybe even a half pint depending on what rear you have. As far as damage I would say the only ill effect would be the limited slip not working with out the additive. But the clutches could still have enough on them for them to work for a little bit before you add new additive. But some one with more knowledge can chime in

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post #4 of 6 (permalink) Old 12-06-2009, 06:30 PM Thread Starter
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Jeffybuilt, when you found the metal shavings, did you see them in suspension in the oil and just pump it out through the fill-hole, or did you remove the cover and see them in the bottom?

Just asking because I only pumped it out, and didn't see any, but don't want to miss anything...

You bring up another question though, one I'm still not clear on, I hear from different places that LSD's are supposed to always turn in the same direction when they're off the ground???

Milkingcowboy, yeah, I found the spec for the dana70 rear axle, it needs 8oz of additive.

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post #5 of 6 (permalink) Old 12-06-2009, 07:18 PM
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Quote:
Originally Posted by n0ekt View Post
Jeffybuilt, when you found the metal shavings, did you see them in suspension in the oil and just pump it out through the fill-hole, or did you remove the cover and see them in the bottom?

Just asking because I only pumped it out, and didn't see any, but don't want to miss anything...

You bring up another question though, one I'm still not clear on, I hear from different places that LSD's are supposed to always turn in the same direction when they're off the ground???

Milkingcowboy, yeah, I found the spec for the dana70 rear axle, it needs 8oz of additive.
I removed the cover and drained it all out, than hand cleaned everything inside. There was a significant amt. of metal in this one. It was mostly along the bottom and in beteween the clutches/gearing. I probably used 2 cans of contact cleaner and many, many rags.

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post #6 of 6 (permalink) Old 12-06-2009, 08:27 PM
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I changed my diff fluid with the lucas gear oil, plus I added the limited slip diff. addative. I haven't had any problems. Lucas is really good stuff, anyone that has LSD should put the addative in, even with the lucas. Lucas bottle said no addatives needed but the dodge LSD need the addative no matter what.
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