Transfer Case LT230 and LT77 Gear Box - Defender Source
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  #1  
Old August 10th, 2016, 09:39 AM
Michael699
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Transfer Case LT230 and LT77 Gear Box

Hello everyone,

Just picked up a 1985 110 2.5 NA last month and wanted to change out the fluids and filters. i do have a couple questions about the weights. I bought a Rotela 15w-40 for the engine oil. but the the Transfer case and Gear box i am reading so many different forums they are getting tiring! lol The Green bible advises an EP 90 weight for the LT230 Transfer Case and a ATFIID for the LT77 Gear Box. Thus Far and please correct me if i am wrong but i can use a GL4 80w-90 for the Transfer case and a ATF III for the Gear Box correct? I can't seem to find any ATF11D but many people advise the ATF111 is ok since it meets or exceeds the ATF11D. Thank you guys in advance!
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  #2  
Old August 10th, 2016, 09:44 AM
Naplm00
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I use 80w90 in the transfer case and redline mtl in the trans.
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Old August 10th, 2016, 09:46 AM
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John B.
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Any gear oil for the transfer box is fine. It does not need to be GL4. any 75, 80 or 85W90 gear oil.

The gear box is better to use a low viscosity manual transmission fluid. Most people in the US us Redline MTL as it is a good choice and fairly easy to find.
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Old August 10th, 2016, 10:12 AM
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Quote:
Originally Posted by Red90 View Post
Any gear oil for the transfer box is fine. It does not need to be GL4. any 75, 80 or 85W90 gear oil.

The gear box is better to use a low viscosity manual transmission fluid. Most people in the US us Redline MTL as it is a good choice and fairly easy to find.
In addition to what John B, wrote:
Another option for the LT77 is Amsoil Synthetic MTF-94 available at NAPA stores.
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  #5  
Old August 10th, 2016, 10:16 AM
Michael699
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Thanks guys for quick replies! I will check out the redline and amsoil.
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  #6  
Old August 10th, 2016, 10:25 AM
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Just to clarify, the Amsoil product is called "Synthetic Manual Synchromesh Transmission Fluid" http://www.amsoil.com/lit/databulletins/g2080.pdf
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  #7  
Old August 10th, 2016, 10:35 AM
Michael699
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Red Line Synthetic Oil - Gear Oil for Manual Transmissions - MTL 75W80 GL-4 Gear Oil

Found this link for the redline. Looks like it meets the synchro specs also.
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  #8  
Old August 10th, 2016, 01:44 PM
Michael699
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Thanks again everyone! I went with a Lucas heavy duty 80w-90 weight for the transfer box and the redline mtl for the gear box.
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  #9  
Old August 12th, 2016, 10:53 AM
Michael699
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Hey Guys sorry to re open the post but after doing a little research the Lucas Gear oil failed alot of viscosity tests! I attached the link below. Looks like Amsoil might be the way to go for the Transfer box and Diffs! I attached the link below. what are you guys using for the Transfer Box and Diffs??

http://www.lastgreatroadtrip.com/wp-...comparison.pdf
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  #10  
Old August 12th, 2016, 11:03 AM
Naplm00
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Redline mtl for the trans and any ANY 80w90 gear oil will work for the lt230. Mines been running on two year changes of Walmart crap

Lt230 is nearly unkillable, as long as it has some kind of lube it will run
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  #11  
Old August 12th, 2016, 11:35 AM
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Yes, it does not matter. Same for the diffs. I've never ever heard of anyone having wear issues in either. Failures are always overload or oil contamination. Cheap oil or expensive oil won't make any difference.
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Old August 12th, 2016, 01:35 PM
Michael699
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Ok sounds good I am just a little paranoid since it is my first defender. Haha!
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  #13  
Old August 12th, 2016, 01:42 PM
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The gearbox is the one thing to be careful with. The early version, like what your most likely has, is prone to layshaft bearing failure. The synchros can also take abuse is not shifted with compassion. Using an MTF can help a bit with safety factor on the synchros.
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Old August 13th, 2016, 04:55 PM
Michael699
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thanks Red! One more question and i think that will be it, haha. With my Jeep Wrangler i simply overfilled the diffs and the Transfer box till it oozed out then re installed the filler plug. I am assuming the same with is the Diffs and the TC on the defenders? I also read the Gear box will take roughly 2.4L and you DONT want to over fill that one.
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  #15  
Old August 13th, 2016, 05:24 PM
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Yes, to the fill plug. Make sure you drain and fill the swivel housings as well. They have their own fill and drain points.
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  #16  
Old August 13th, 2016, 05:38 PM
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I don't see why overfilling the LT77 would present a problem.
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  #17  
Old August 13th, 2016, 05:57 PM
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Quote:
Originally Posted by sonoronos View Post
I don't see why overfilling the LT77 would present a problem.
Ed, would overfilling an 85/95/380/380-stumpy be a problem, or is that something specific to the LT77?
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  #18  
Old August 13th, 2016, 07:10 PM
Michael699
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Sounds good and for the swivel housings are you guys using grease or oil? I can use a grease gun and the old stuff will just push out? Is that correct?
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  #19  
Old August 13th, 2016, 07:31 PM
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IMO, oil is better. It lets you know when the seals are bad.

If you use grease, you need to use the special semi-liquid Land Rover stuff. You can get most of it out by blowing into the fill hole lightly.

In the end, you might just get oil in there anyway as the seals between the axle and swivels usually leak.
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  #20  
Old August 13th, 2016, 08:06 PM
Michael699
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Oh ok sounds good just use the same stuff as the diffs? The 80w90 weight in the swivels I am assuming?
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