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Old 04-28-2022, 03:11 PM   #1
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Default Axel HF35 limited or not differential?

Ok, the title says it all. I want to change the fluid on the rear differential on my 91 d21 2wd base. I need to know if it has a lsd or not? Or does it even matter if it has the additives for lsd and this one isn't? I think just regular 75w90. Does synthetic make a big difference?
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Old 04-28-2022, 07:03 PM   #2
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Base model, probably not. If it had a LSD they it would have a sticker/tag on the diff cover stating it.



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Old 04-28-2022, 09:37 PM   #3
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Quote:
Originally Posted by dvdswan View Post
Base model, probably not. If it had a LSD they it would have a sticker/tag on the diff cover stating it.



Thatís what I thought. Does it matter if the gear oil that I have has the additives for the limited differential? Iím really just using Dino oil.
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Old 04-28-2022, 09:46 PM   #4
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Nope. You're only using more expensive 90w. LOL I've used Redline and Royal Purple, what ever you prefer, as long as it's 90w, use it.

Manual transmissions need GL-4 only. Just to add to the confusion.
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Old 04-29-2022, 12:18 AM   #5
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Walmart gl5 is what i use.
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Old 04-29-2022, 03:09 AM   #6
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Just adding to the info: If you have a limited-slip diff, you need limited-slip gear oil.

If you have a non-limited-slip, it can use regular gear oil or limited-slip gear oil.
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Old 04-29-2022, 04:22 AM   #7
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Another vote for supertech gl-5 or whatever the cheapest 90w gear oil you can find is. I'm almost certain yours is just a regular open differential, but one way you can check is to lift the back up and spin one of the wheels. If the other wheel spins in the opposite direction it's open. If both wheels spin the same direction it's a limited slip.

It's also fine to use the stuff with limited slip additives in an open differential.
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Old 04-29-2022, 11:15 AM   #8
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OP: Put truck on a hard, level surface then block your front tires, release the emergency brake, jack up the rear from the center of the differential. Spin one rear tire and observe the direction of the spin of the other. If opposite direction, it is an "open" rearend (not LSD).
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Old 04-29-2022, 02:48 PM   #9
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I used Amsoil GL5 in my former 93, works fine
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