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Was planning to drain/replace the fluids and can't find GL4 anywhere. Trust me,I looked. Did get Lucas 80-90 for the axles but can I use the synthetics (GL5)in the trans and transfer? Thanks all!
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1978 MOD 109 -
Something like this?
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I run Amsoil in my motorcycles. I hate ordering it, the shipping always bites me in the butt. O'Reilly,Nappa,Auto clown,Advance,Tractor suppy,and the local truck stop has ZIPP. They have GL4 in 140wt, that wont leak out the seals but it would feel like I'm dragging an anchor.
1978 MOD 109Comment
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NAPA has exactly what you are looking for. NAPA # SL24239. If they don't have it, simply request that they order it from their warehouse.
Print this page out and bring it with you:
CRC Sta-Lube 85W-90 GL-4. https://www.napaonline.com/Catalog/C...239_0006410049Comment
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Thanks!
1978 MOD 109Comment
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Shell Spirax S4 TXM 80WComment
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Too many unspecified variables.
What are you running?
What is the gearbox? Are the diffs OEM?
What is your average running temp in the gearbox and diffs?
What is your maximum temp in them?
How often do you exceed 70ºC, and for how long?
Do you pull heavy loads? For how long?
Do you do beach driving, or similar? How often?
Do you have diff lockers? Especially, do you have Detroit Diff Lockers or similar?
These all are factors that can help you decide whether or not to avoid GL5 oils. In any case, unless you have a limited slip diff, do not use hypoid LSD oils.Comment
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Oh lord, the oil debate..............Let's talk about religion and politics next?
It's a 1978 MOD 109 with 65,000 miles on it,don't drive on the beach or road, I've got 2 miles on it so it didn't quite get up to working temp. It's now on jack stands waiting for a brake cyl,fuel pump rebuild kit, PCV rebuild) and a hub seal.
Picked up some Lucas 80-90 for the axles and ordering Sta-Lube from Nappa Monday. I'm assuming the axles(dana 60 rear LR front) are open with no factory locker or limited slip.1978 MOD 109Comment
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It's not so much a debate issue as one that has a large number of possible variables. In the end, there is no one right answer to fit every scenario anymore because vehicles have so many metals and combinations.
Oh lord, the oil debate..............Let's talk about religion and politics next?
It's a 1978 MOD 109 with 65,000 miles on it,don't drive on the beach or road, I've got 2 miles on it so it didn't quite get up to working temp. It's now on jack stands waiting for a brake cyl,fuel pump rebuild kit, PCV rebuild) and a hub seal.
Picked up some Lucas 80-90 for the axles and ordering Sta-Lube from Nappa Monday. I'm assuming the axles(dana 60 rear LR front) are open with no factory locker or limited slip.
That being said, from what you've said, I would say that you don't need to worry GL4/GL5 differences since the problems only ensue in yellow metals at temperatures that exceed 70-80ºC and become critical at 90-100ºC. The diffs are fine in any case.
The thing you need to make certain of is that the oil is suitable for EP. That's all.
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There acutally is a correct answer and that is to use what the vehicle manufacturer specs out for it. You can't go wrong with that.
I still use the CRC GL4 found at NAPA. Easy to find, cheap, what is recommended. No debate, no what if....
On the other hand I'm not worried if I put GL5 in the diff if that's all that's available. These aren't Ferrari's and would probably run for a long time using the old bananna and sawdust trick.
Jason
"Clubs are for Chumps" Club presidentComment
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OK, cool. I just thought that the GL5 had the "EP" additives that were gonna' eat the yellow metals up in the trans and transfer case. I see alot of GL4,5 oil around but just had my concerns. The truck will get alot of road time though so I'm sure it's gonna' get hot.
Can I dump some "Lucas oil additive" in with the GL4? I've had great results with it in all my other older vehicles.
Thanks all.1978 MOD 109Comment
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Our hosts have sold Amsoil gear oil for years, and specified it as appropriate for all series trucks. IIRC modern synthetic GL5's don't have the yellow metal issues that the dino oils do. But I am happy to be corrected if I am wrong on this point.
As of this moment I have had no problems after 20 years of running Amsoil and Mobil1 gear lubes.Comment
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Many oil companies have changed over to using non-active sulfur to address nonferrous metal attack issues. However, I've never seen a bottle of GL-5 designate active or non-active sulfur in the EP additive package. Some GL-5 oils state that they are formulated to be noncorrosive to bronze and other yellow metals. I think there may also be a tie between the MT-1 rating and non-active sulfer - can't remember for sure.Comment
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