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Locking rear diff

Locking rear diff

Postby dustcloud [OP] » Nov 04 2011, 2:39am

I looked at the window sticker on my truck and it says it came with a 3.73 locking diff. But I just tore the crap outta my yd goin around an uphill corner only one tire spun. How can I tell if it is a posi and if it isnt working does adding that "additive" to them thats supposed to be in them really work? Thanx for ne replys.... Joe
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Re: Locking rear diff

Postby ASTE25 » Nov 04 2011, 2:43am

Look for the code "G80" on your glove box sticker. If it's got the G80 code, then it came with a locker. Unless someone replaced it with an open rear end, it has a locker type. The new trucks have a locer type limited slip rear end. I don't believe they take an additive like the old "posi trac" rear ends did. I think that additive was designed to prevent the clutch packs in those rear ends from chattering.
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Re: Locking rear diff

Postby EKinMN » Nov 04 2011, 12:34pm

Jordan is correct. There is no "special" fluid required. Just a high quality synthetic 75w90 is all you need. That siad, there could be something wrong mechanically, or it was changed before you bought it.
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Re: Locking rear diff

Postby dustcloud [OP] » Nov 04 2011, 2:45pm

ok I will look and post what I find. Thanx guys!!
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Re: Locking rear diff

Postby worktruck2011 » Nov 04 2011, 8:50pm

Just because it has a locking differential doesn't mean it'll engage fully right away:

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Re: Locking rear diff

Postby My05Sierra » Nov 04 2011, 8:59pm

In addition I believe you have to be going under 20 mph in order for it to lock in. I know on occasion that I can hear mine kick out at about 20 mph.

On a similar note I think if your wheel speed is too high, that it will kick out or won't engage. Not positive on that one though.
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Re: Locking rear diff

Postby ASTE25 » Nov 04 2011, 9:00pm

Like the video said, my wheel that loses traction only makes about one revolution before the locker kicks in. Oh, it sounds like the rear end is gonna fall out when it locks, but, it stops the wheel spin and my truck takes on off, through the obstruction. EKinMN is right, your rear end may have something wrong. You either should not have torn up your yard, or, you should have torn it up with both wheels, had the locker been working correctly.
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Re: Locking rear diff

Postby dustcloud [OP] » Nov 04 2011, 10:23pm

Ok, I have the G80 on the glove box sticker. When I tore up my yd it was the uphill side wheel that spun for a good 10 feet cuz it was the unweighted wheel and I was going about 5 mph. Guess maybe I'll hafta take the cover off and see if it has the clutch pack in it or not and go from there.
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Re: Locking rear diff

Postby ASTE25 » Nov 05 2011, 1:04am

A locker will not have a clutch pack. 10 feet is not really that far of a spin. The locker might not have had time to kick in.
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Re: Locking rear diff

Postby Chasmanian » Nov 05 2011, 1:43am

10 feet? I don't know, mine locks in pretty quick.
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