2004 RWD differential to 2003 AWD

2004 RWD differential to 2003 AWD

Postby WDMICKJR [OP] » April 19th 2017, 7:19pm

I found out that the 2003 AWD was an inside carrier bearing and it has separated the axles splines from the ring and pinion carrier. Akin to worn. I have 2000 RWD sitting in the yard and found 2000 5 lug is not the same as after 2002 6 lugs. Axles are a bit thicker on the 2002 and up.
So I found a 2004 RWD differential at your local junk yard.
QUESTION is:
Would a 2004 RWD Differential suffice as a replacement for 2003 AWD?
'92 Astro CS with '95 4bolt 355 LT1, hand ported *374s & intake (David Vizard tech), EFI 24x, 211/219*, 1.94/1.6", 1.7"roller rockers .574"/.583", shift kit & corvette servo, G80, GT4, 255/70-15s, 2001 LS1 pcm; aka fAstro
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Re: 2004 RWD differential to 2003 AWD

Postby TurnNburn » April 19th 2017, 7:51pm

They are the same and the axle will bolt right in but verify gear ratio before swapping, or your going to have a bad day
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Re: 2004 RWD differential to 2003 AWD

Postby WDMICKJR [OP] » April 19th 2017, 8:52pm

yes. GU6 / 3.42:1.
could you maybe answer another question?
I am exploring all my options...
Are all ring and pinion carriers the same?

I would rather use my 2000 RWD ring and pinion plus carrier and obtain new axle since the carrier is probably ruined where the carrier accepts the 28 splines 6 lug on 2003. I don't know what I get from a junk yard. And would save me tons of work. If so the carriers are all the same. I understand that 1995-2002 used 28 splines, 2003 could have both 28 and 30 and 2004-2005 was all 30 spline.

I suppose discovery will answer all these questions.
Last edited by WDMICKJR on April 20th 2017, 12:44am, edited 1 time in total.
'92 Astro CS with '95 4bolt 355 LT1, hand ported *374s & intake (David Vizard tech), EFI 24x, 211/219*, 1.94/1.6", 1.7"roller rockers .574"/.583", shift kit & corvette servo, G80, GT4, 255/70-15s, 2001 LS1 pcm; aka fAstro
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Re: 2004 RWD differential to 2003 AWD

Postby TurnNburn » April 19th 2017, 9:04pm

yeah that's kind of a grey area since you cross over in that year. I don't have an answer for you. But when you figure it out, post back up here and let us know. As I am sure someone else will ask this question again. Oooooor just wait a few minutes and master mind Will, will be on to clear things up.
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Re: 2004 RWD differential to 2003 AWD

Postby WDMICKJR [OP] » April 19th 2017, 10:20pm

now I am told all 2nd gen ring carriers are all 28 spline. 2 sources. and that all 1992 and later are 28 spline.
i still dunno.

i will update after discovery.
'92 Astro CS with '95 4bolt 355 LT1, hand ported *374s & intake (David Vizard tech), EFI 24x, 211/219*, 1.94/1.6", 1.7"roller rockers .574"/.583", shift kit & corvette servo, G80, GT4, 255/70-15s, 2001 LS1 pcm; aka fAstro
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Re: 2004 RWD differential to 2003 AWD

Postby AstroWill » April 19th 2017, 10:56pm

Did I hear my name?


Up through 89 are 26 spline, 90-05 are 28 spline.
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Re: 2004 RWD differential to 2003 AWD

Postby TurnNburn » April 19th 2017, 11:02pm

Image
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Re: 2004 RWD differential to 2003 AWD

Postby MI_Ghost » April 20th 2017, 9:09am

And to make it a little clearer.
2003-2005 where disc brake axles, 6 lug and approx 2 1/4" wider than the earlier 96-02 drum brake, 5 lug axles. You can not use the 03-05 axle shafts in the 96-02 axle housing because of the extra length.

The differential carrier along with the ring & pinion are the same.

The 04 RWD axle would be a direct swap for the 03 with verification of the gear ratio.
Installing the 02 differential and gearing into either the 03 or 04 axle would be no different than putting in new gears, You still need to have the gears set up properly.
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