Dana 30 gear oil

I like Valvoline 85W-140 conventional for the front and back. Friction modifier added to taste when applicable…
 
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This is the one I use…

Valvoline 85W-140 Conventional Gear Oil

May very well be the same oil with label differences because of the market they’re being sold in. Both seem to be the High Performance Valvoline GL-5 85W-140 Gear Oil…

Also, in the link you attached, it looks like it is 235 Baht which is about $3 US cheaper per container than what I can buy it for right now. The price has went up 3x what it cost 2 years ago…
 
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I use 75W140. Synthetic only. I can easily get Valvoline so that’s what I use.
Know that your gears will run cooler when lubed with a conventional gear lube, and yes that is true. That is why gear manufacturers like Revolution Gear & Axle and Yukon and axle manufacturers like Currie and Dynatrac recommend conventional gear lubes.

For one example... "Recommended gear oil is an 80W-90 or 85W-140, Non-Synthetic, GL5 grade or Higher, Name Brand Oil." at https://www.revolutiongear.com/ring_and_pinion_break_procedure

Yes a synthetic will work in an existing axle but the gears will still run cooler with a conventional.
 
Know that your gears will run cooler when lubed with a conventional gear lube, and yes that is true. That is why gear manufacturers like Revolution Gear & Axle and Yukon and axle manufacturers like Currie and Dynatrac recommend conventional gear lubes.

For one example... "Recommended gear oil is an 80W-90 or 85W-140, Non-Synthetic, GL5 grade or Higher, Name Brand Oil." at https://www.revolutiongear.com/ring_and_pinion_break_procedure

Yes a synthetic will work in an existing axle but the gears will still run cooler with a conventional.

I have heard that but also have talked to lubrication engineers who say that’s BS. Who is right? I don’t have a clue.

If the company that makes your gears won’t warranty them with synthetic oil….then you probably should use conventional oil even if the company is wrong.

Either way, I personally only use synthetic gear oil in anything that requires gear oil. Is it better? Probably. Will it last just fine on conventional oil? No doubt.

I’ll keep using synthetic gear oil. But I really don’t care what other people use. Clean oil of the correct weight and chemical composition, changed at appropriate intervals is far more important than the type of oil (synthetic vs conventional) used.
 
But if your rear axle has the Tracloc limited slip differential inside

I've finally found a website that can decode my (export) VIN https://www.vindecoderz.com/EN/check-lookup/1J4F459SX1P304875

FRONT AXLE - DANA 30; DMM: AXLE RATIO - 3.07; DRK: REAR AXLE - DANA M44 / 216MM RBA; DSA: AXLE - ANTI-SPIN DIFFERENTIAL

anti-spin = traclock? but I'll go for that Valvoline 85W-140 LSD for front & rear anyways .. seems approved by @Jerry Bransford :-)
 
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a bit off topic.. but if I have a DANA 30 and M44 regarding the VIN, which lube lockers are the right ones?

Based on @Chris thread https://wranglertjforum.com/threads...d-what-the-difference-is-with-each-axle.9060/ I would have expected there is only a 44, since a M44 is not mentioned.

DANA 30 https://www.amazon.com/gp/product/B008RAAOJW/?tag=wranglerorg-20 (front?)
DANA 44 https://www.amazon.com/gp/product/B008RAD3NG/?tag=wranglerorg-20 (wont fit M44 based on comments)
DANA M44 https://www.amazon.com/gp/product/B06ZZYSSPR/?tag=wranglerorg-20 (supposed to fit M44 based on comments)

which one do I need for the rear? sorry, bad picture.. but it's already pitch black now. can take a better one tomorrow.

IMG_20230325_163709.webp
 
which one do I need for the rear?

probably found the answer myself. regarding some other forum post the DANA M44 on the jeep spec sheet is a DANA 44 and Jeep ads that M for no reason to confuse noobs like me :)

pulled the brightness up all the way in photoshop, and the housing form looks exactly like the LLR-D044 Lubelocker

IMG_20230325_163709x.webp
 
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probably found the answer myself. regarding some other forum post the DANA M44 on the jeep spec sheet is a DANA 44 and Jeep ads that M for no reason to confuse noobs like me :)

pulled the brightness up all the way in photoshop, and the housing form looks exactly like the LLR-D044 Lubelocker

View attachment 410304

It will be the first 2 gaskets you linked…

The last link is for the Aluminum center Dana 44…
 
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