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Old 08-25-2012, 08:36 AM
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is this a borg warner 76 or not?

Hi Guys
Im having trouble getting a rebuild kit for my rear differential.

its a GU4 rear axle ( 3.08) with IRS, from a 1999 lumina 3.8L AT





here is a similar diff, not mine



thanks in advance to anyone who can help id this diff, so that I can order a reuild kit !

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Last edited by old yukon; 08-25-2012 at 08:43 AM.
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Old 08-25-2012, 08:48 AM
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That's a new one on me. I've never seen a Lumina with a rear differential. Did you try Randy's Ring & Pinion, DTS, National Drivetrain?
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Old 08-25-2012, 10:50 AM
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Tried them all no go !

I did 101 searches and the best I cam up with was a Borg warner M78

But every image for a borg warner 78 doesn't match to a Chevrolet Lumina 99.

this is not mine but it come up as a 3.08 Irs m78



this has me stumped.
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Old 08-25-2012, 10:59 AM
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Correction borg warner 78 not 76 as the title of the thread says.

Big gear head, you posted something on the borg warner 78 being from Australian rear ends, what would it be doing in a 99 Chevrolet Lumina ?
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Old 08-25-2012, 12:21 PM
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GM shares some platforms with Holden, their Australian operations. The GTO was a Holden chassis, as is the new SS. Rear drive and AWD is a staple in the Holden lineup.
Is this in a Lumina van? Which engine does it have?
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Old 08-25-2012, 12:25 PM
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Thanks for the reply lmsport

no its a sedan

the id tag says engine- LN3 but it looks a lot like the the 3800 series ( L36)
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Old 08-25-2012, 03:06 PM
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Drivetrain - LS1GTO.com Forums
Go here and see if you can find some information. There are a few guys on there that order Borg Warner parts directly from Australia. That is definately a Borg Warner differential that you have. The '04 to '06 GTO, some 3rd gen Camaros and Trans AMs from '85 to '90 and the G8 all used the Borg Warner differentials.
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Old 08-25-2012, 08:40 PM
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You dont call yourself Big Gear Head for nothing. Fount it, i think.

GM 7.75 IRS Rear - 04-06 GTO

its a GM 7.75 IRS Rear - 04-06 GTO



thanks
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Old 08-25-2012, 10:03 PM
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I rebuilt one of those about a year ago. Randy's had the kit, but it was expensive. They have a reputation for causing problems around 20,000 miles. As I understand it they are actually built by Dana now. Dana suposedly bought Borg Warner in Australia and does the GM differentials there now. They used Koyo bearings in them and they didn't hold up very well. I've still got the GM alignment tool for lining up the GTO rear sub frame when reinstalling the rear end.
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Old 08-25-2012, 11:15 PM
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Man now your opening up a new can or worms.

But is seems an important one.
sub frame alignment

discussion
GTO Alignment Process - LS1GTO.com Forums

official procedure
http://www.gto-justice.com/PDF/GTO_C...0Alignment.pdf

here a version of the tool by Pedders



thanks again, your the man !

Hay, anything else I must know before going ahead with the rebuild??
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Old 08-25-2012, 11:36 PM
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hears the front tool while we're at it...




Might as well do the who suspension job with all that effort.
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Old 08-26-2012, 10:54 AM
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HAY BIG GEAR HEAD
you said you have the Gm tool, right
could you give me the measurements star to star so i can fab up my own jig

that will be a great help

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