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Old 11-30-2013, 04:42 AM   #1
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Question Driveline question... yes...fluid type too, but more!



Lol. I know, I know...

Was told when I bought the Jeep ('06 Rubi) the driveline fluids were recently changed, I'm thinking not. Coming up on 90k, I've put about 3k on her. Anyway, I've trolled away on here, JF, and my manual for answers. I still have questions from the experts.

1) Why does my Rubicon need 75w-140 for the Dana 44's, but other Jeeps don't? Seemed the others only needed 80w-90 even if they too came with the Dana 44's... Didn't make sense to me, same part should need same fluid regardless the model its in. Did I misunderstand something? I'm not buying fluids from a dealership, so Redline MT-90? Rp Synchromax? Other?

2) The transmission is the NSG370, so 75w-90? Again, MT-90 or RP Synchromax? Other?

3) I did notice a small leak from the driveshaft area from the transfer case. Guessing its the seal. I've never owned a 4x4, never dealt with these kinda things, is it a straight forward repair? I'm fairly mechanically inclined. Its not bad, so I'll change the fluid now, but its too damned cold outside for lengthy repairs.

Any other advice or things I outta do around the 90k mark, let me know. I appreciate it in advance!

Butch

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Old 11-30-2013, 09:11 AM   #2
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I really hate bumping...but I gotta order the oil, no one sells this stuff around here. thanks folks

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Old 11-30-2013, 09:40 AM   #3
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For the rear axle you need the heavier oil due to your LSD.
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Old 11-30-2013, 09:48 AM   #4
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Shouldn't have an LSD it should have a locker.

If you're towing or it's seeing severe use I'd go with the heavier stuff in the rear axle. The manual should state the proper fluid weights though. Folks say the MT90 is good for the manual trans, I imagine the Valvoline MTF would work fine too but I don't have a manual so I haven't used them in a Jeep.

I use Valvoline 75-90 in the diffs with zero issues. ATF+4 in the T-Case.
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Old 11-30-2013, 08:09 PM   #5
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So if I don't don't tow I could use the lighter stuff? Or the locker REQUIRES the heavier stuff?
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Old 11-30-2013, 09:27 PM   #6
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I would think that you could use 75-90 just fine, but obviously they know better than I at the factory. They spec 75-140 apparently, perhaps they have a reason. I wonder why folks don't run lightweight shockproof oil by redline in gearboxes and axles, but again sure there is a good reason.
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Old 11-30-2013, 09:43 PM   #7
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In some circles, they would do the lighter for gas mileage. Here, these boxes on wheels wouldn't gain much I'd guess. At this point I'm wondering from a curiosity standpoint why the difference. And why, unless I'm remembering wrong, the Rubi Dana 44 must be heavier than the other
I'm still new and learning. I'm on my iPad, but earlier, someone said because the Rubi has lockers, and because of the lockers, it requires the heavier fluid. Ok, I'll buy that. Why. Lol. I'm a pain, I know. I just like to understand things. I'll make a guess that the lockers are harder on the axels, so needs the heavier fluid? Which goes back to, what if you don't use the lockers? For arguments sake? I use mine from time to time. Again, I thank all for being patient
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Old 11-30-2013, 09:53 PM   #8
Knows a couple things...

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The Rubicon's axles requires the same basic lubes other TJ axles require, 80W-90 for most conditions or the heavier 75W-140 for heavier-duty uses like towing or rock crawling.

From the FSM...
RUBICON 216 FBI (Model 44) - Mopar Gear
Lubricant 80W-90 (Trailer Towing Mopar Synthetic
Gear Lubricant 75W-140)

The Rubicon's rear axle does indeed also have a limited slip differential that operates when the locker is not locked. However, a LSD doesn't require any heavier viscosity than an open axle does.

Your NSG370 requires a slightly different lube than the older AX5 and AX15 transmissions use so Redline MT-90 would not be a good choice. Two good choices include Redline MTL or Royal Purple Synchromax 70W-80, both of which are synthetics which work great in cold conditions like you get there in Mass.

Changing the rear seal on the transfer case is not difficult but it's not something I'd recommend for a beginner. I've had the rear of my Rubicon's tcase open & it had a few surprises that my previous 231 tcase did not have, one of which got my attention for several days before it was back on the road.
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Old 12-01-2013, 10:47 AM   #9
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Ok, thanks Jerry! I plan on doing more trails next year, and maybe a Jeep Jamboree if time allows, so I'll def go with the heavier.
Again, this is why after having many sports cars and being on their forums, I truly LOVE the Jeep forums. I can ask questions and not cringe awaiting 99% flaming in the hope of 1% actual answers. So to the community, I thank you all!

I will ask one more. When I was working on my daughters XJ, the dealership wanted, if I recall correctly, some serious money for the driveline fluids. For the rear diff and transfer case, what do you use and suggest? I see what you wrote from and I read from the FSM, but we all know things get better from when things are originally built. Thanks.

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