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Unread 07-10-2013, 02:49 PM   #1
austinp2
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Hey guys, so I have a 93 yj and the first U joint my rear driveshaft broke. The whole driveshaft fell out and tons of oil leaked out the back. I am unsure with what oil to replace it with... Is it transmission oil, or is it a different kind of oil. Please help!

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Unread 07-10-2013, 03:03 PM   #2
Evildriver-3
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depending which t-case it may just be a trans fluid and not a gear type oil. Check the end yoke that the centering tabs aren't broken
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Unread 07-11-2013, 10:26 AM   #3
biffgnar
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For pre-96/97 231s with stock output if the driveshaft is off all the TC fluid will drain out. Pretty sure ATF+4 is what is spec'd for refilling that 231.
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Unread 07-11-2013, 03:19 PM   #4
WhiteMtnJeep
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ATF+4 goes in the t-case.
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Unread 07-12-2013, 12:49 AM   #5
jnicewan
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The spec fluid depends on who you want to listen too, Jeep/chrysler naturally preferred their fluid and back then it was ATF+2 & +3, New Process simply called for ATF, Chevrolet (NP231C) like chrysler preferred their fluid and back then it was Dex II & III. And if Ford used this case I bet they would've spec'd Mercon. Other fluids people have successfully used are motor oils from 5w-30 to 30W. Since ATF+4 is the current fluid that superceded the older ones, it is a synthetic based ATF, its probably the better fluid to use but not needed.

Dry fill capacity is less than 2 qts, or closer to 1.6 qts. I would go ahead and drain whats left and start with all new fluid.
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Unread 07-13-2013, 09:53 AM   #6
austinp2
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Ok sounds great. One more thing. Is it the same for the transfer case or is it a different fluid?
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Unread 07-13-2013, 11:47 AM   #7
jnicewan
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Quote:
Originally Posted by austinp2 View Post
Ok sounds great. One more thing. Is it the same for the transfer case or is it a different fluid?
I dont know what your asking, but the t-case takes auto trans fluid (ATF). Nothing special needed, get cheap ATF fluid, Dex/Merc, or put ATF+4 in it.
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