Gear oil for a Truetrac - Defender Source
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  #1  
Old November 24th, 2017, 02:27 PM
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Gear oil for a Truetrac

I learned a long time ago not to debate oil on a forum. In 2004, we almost had a war on the factory five forum about what oil to use and I swear a couple people left the forum over their outrage!

I searched this forum and Google looking for my answer, but then decided to just bite the bullet and straight up ask. What’s the worst that could happen? I run Redline MT90 (75w90 GL4) in my Series III in every case, okay except the 300TDI. I planned to do the same in the TC, swivels and diffs in my LS equipped 90, but then noticed that Eaton says not to use synthetic or FM with the Truetrac. Most other gear oils are GL5 and contain FM.

So, what is the correct answer?
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  #2  
Old November 24th, 2017, 02:56 PM
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When I fitted mine I asked GBR Bill and he said plain old gear oil. So I run 90 weight.
The eye-ties are also very passionate with oil weights and brands.
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  #3  
Old November 24th, 2017, 02:58 PM
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same here, 90 weight for 25 years without an issue...
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  #4  
Old November 24th, 2017, 03:15 PM
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It does not matter. You are just wasting money using synthetic in the axles. Nothing in the axles ever wears as long as the oil is kept clean. Bulk 80W-90 in 5 gallon pails is the easiest way to go.
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  #5  
Old November 24th, 2017, 03:24 PM
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Many flavors of oil are fine... change it if you go wading often with questionable seals...


.
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  #6  
Old November 24th, 2017, 03:25 PM
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Another vote for doesn't matter. What matters much more is changing it on schedule and after getting water into the diff.

Car enthusiast forums are usually full of premium, gourmet oil shills
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  #7  
Old November 24th, 2017, 06:55 PM
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Man, I’m liking these answers!

How about the GL5 issue? Should I look for GL4 or is that only a TC/tranny concern?

I will admit to f’ing up on the 109. After carefully rebuilding the front axle and installing disk brakes to manage the 300tdi, I should have gone with a heavier weight non-synthetic. One swivel has a slight drip. Live and learn.
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1976 Series III 109 "Montoya" ("You killed my father, prepare to die")
1988 Defender 90 LHD "Vizzini" (speed demon from Sicily)
1987 Defender 90 MOD LHD "fezzik" (giant rock thrower)
1975 Porsche 911 hot rod
1964 Porsche (Beck) 904
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  #8  
Old November 24th, 2017, 07:15 PM
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It is only an issue with the gearbox. You can use regular gear oil in the transfer case and axles.
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  #9  
Old November 24th, 2017, 07:17 PM
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GL 5 is ok for the diffs but I been using 4 as I get by the drum, is the oil coming from the ball/seal or from behind the seal? You did use sealant and not rtv? I like to put a thin coat of of permanent on the outer edge before offerING it up.
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Edward Teach is the Blackbeard, and is a member of the Birmabright Brotherhood.

Still looking for that place where I can carry a paddle and get asked what's that.

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85 LR90
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  #10  
Old November 24th, 2017, 10:18 PM
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I use synth in the LT230 and regular in the diffs. I replace the diff fluidss after any large water usage. Not wading, but getting stuck wading... then I might replace it. I change all my fluids every year or so---it just seems intuitively smart to run clean fluids.

I think I just run 75/90 Valvoline in the diffs--whatever was cheapest.

I'd love to see your conversion. Are you planning to come up to CO or Utah for some wheeling in 2018? Just looked at a map, and a little longer than I originally thought (I don't know Texas well and everyplace is more miles than expected) but if you do, drop me a line. Fun to plan some camping/wheeling. I have to start thinking about what I want to hit next year now that I am done with mine...
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  #11  
Old November 25th, 2017, 01:35 PM
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just one note - if you were using a clutch-type LSD, I would definitely recommend an LSD specific gear oil.

But since the truetrac is essentially a torsen, it's all good
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  #12  
Old November 25th, 2017, 01:46 PM
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Quote:
Originally Posted by Davis View Post
I'd love to see your conversion. Are you planning to come up to CO or Utah for some wheeling in 2018? Just looked at a map, and a little longer than I originally thought (I don't know Texas well and everyplace is more miles than expected) but if you do, drop me a line. Fun to plan some camping/wheeling. I have to start thinking about what I want to hit next year now that I am done with mine...
Chris, my best friend (old navy buddy) lives in Greeley and I’m up there several times a year. He and his wife are avid campers, but they’ve now reverted from a more primitive approach to a large 5th wheel trailer. I plan on driving up in the Spring. The wife will probably stay behind as she still refers to my truck as the Offender. That’s probably my fault as I apply the “easier to get forgiveness than permission” approach in my car/truck dealings. Where are you located?
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1976 Series III 109 "Montoya" ("You killed my father, prepare to die")
1988 Defender 90 LHD "Vizzini" (speed demon from Sicily)
1987 Defender 90 MOD LHD "fezzik" (giant rock thrower)
1975 Porsche 911 hot rod
1964 Porsche (Beck) 904
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  #13  
Old November 25th, 2017, 02:39 PM
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Boulder - not far from Greeley (about an hour). I'll pm my info so we can stay in touch. Maybe put a defender source camp/wheel meet up for then...
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  #14  
Old November 25th, 2017, 10:54 PM
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Quote:
Originally Posted by Factoid View Post
I learned a long time ago not to debate oil on a forum.
Nor ask whether to run oil vs grease for the wheel bearings.

Everyone knows the answer is grease but there are some out there who think otherwise...

Been running that same diff up front since 1997ish on straight mineral 90wt or 85/90 or whatever is closest to hand. Same-same, day in, day out. No fancy/exotic name, no small batch artisanal production either.
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