REAR AXLE / DRIVE SHAFT

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Sticky Differential gear ratios

Last post by Bret Schmerker « Wed Aug 03, 2022 9:58 pm
Replies: 13
by MountainManJoe » Thu Feb 09, 2012 3:44 pm

differential.jpg
The easiest way to determine your final drive or gear ratio is to look at your RPO codes. This is a set of 3-character codes used...

13 Replies

42231 Views

Last post by Bret Schmerker
Wed Aug 03, 2022 9:58 pm
Badass diff covers

Last post by MountainManJoe « Mon Jan 17, 2022 2:52 pm
Replies: 11
by MountainManJoe » Sun Feb 06, 2011 10:58 pm

11 Replies

7379 Views

Last post by MountainManJoe
Mon Jan 17, 2022 2:52 pm
G80 vs Truetrac

Last post by Astrophysics « Sun Jun 20, 2021 10:30 pm
Replies: 5
by Captn. Crunch » Wed Dec 04, 2019 7:16 pm

As some of you may remember, my last van was equipped with Torsen carriers front and rear. When road cancer ate my beloved test mule to the bone, I...

5 Replies

7855 Views

Last post by Astrophysics
Sun Jun 20, 2021 10:30 pm
NP 233 spline count appears to be 32 in and out

Last post by WE7X « Sun Nov 24, 2019 7:22 pm
Replies: 3
by WE7X » Mon Oct 21, 2019 9:00 pm

I recently found a NP-233C out of a rolled Blazer. It came attached to the transmission and was too cheap to pass up.
The conversion postings...

3 Replies

2334 Views

Last post by WE7X
Sun Nov 24, 2019 7:22 pm
G80 & GT4 for 2004 AWD Astro Conversion

Last post by Captn. Crunch « Sun Oct 27, 2019 5:04 pm
Replies: 33
by forrestmccarthy » Tue Apr 09, 2019 9:29 pm
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I just got some bigger tires (255/70r16) and my van is now a bit sluggish on steep climbs. I’m considering changing my gearing from 3.42 to 3.73 and...
33 Replies

15497 Views

Last post by Captn. Crunch
Sun Oct 27, 2019 5:04 pm
7.5 " 10 bolt Chevy 98 to 2002 rear axle

Last post by Astrophysics « Mon Jun 10, 2019 10:27 am
Replies: 4
by Astrophysics » Wed Jun 05, 2019 11:02 pm

Hi,

Saw a you tube video of G80 Torson type gear limited slip rear axle being OEM in Chevy Camero.
So Astro posi was Eaton with friction plates....

4 Replies

3164 Views

Last post by Astrophysics
Mon Jun 10, 2019 10:27 am
I think it's finally re-gear time. Where to source parts?

Last post by Astrophysics « Tue Jan 22, 2019 5:46 pm
Replies: 36
by Herbie » Thu Jul 28, 2016 3:51 pm
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So after like seven years (five with a lift and taller tires), I'm finally at the point where I can make the spend on doing a re-gear and adding a...
36 Replies

17985 Views

Last post by Astrophysics
Tue Jan 22, 2019 5:46 pm
Non-OEM Axle Swaps, Revisited

Last post by Bret Schmerker « Thu Nov 08, 2018 10:51 pm
Replies: 6
by Herbie » Mon Oct 05, 2015 1:22 pm

So this topic has been covered a bit here and there.

A search reveals some scattered info about the possibility that an E-series Ford 9 might be...

6 Replies

5826 Views

Last post by Bret Schmerker
Thu Nov 08, 2018 10:51 pm
CLUNK, when making a turn?

Last post by LaGrasta « Thu Jan 18, 2018 10:10 am
Replies: 5
by LaGrasta » Mon Jan 15, 2018 9:10 am

When making a turn, I hear a clink in the rear axle, suggestions? Gears, bearings, etc?

5 Replies

3654 Views

Last post by LaGrasta
Thu Jan 18, 2018 10:10 am
Drivetrain noise when in gear

Last post by Mmusicman « Sun Oct 29, 2017 4:01 pm
Replies: 5
by rlyoung » Thu Oct 12, 2017 1:54 pm

It may have been there all along, but I'm guessing not. It's a very faint whoop whoop noise which is rpm dependent, and is--I think--coming from the...

5 Replies

3921 Views

Last post by Mmusicman
Sun Oct 29, 2017 4:01 pm
Rear Diff oil changed; what I learned and a question.

Last post by Wiley « Sun Aug 06, 2017 9:25 pm
Replies: 3
by rlyoung » Wed Aug 02, 2017 12:35 pm

2001 AWD 112,000 miles. Only other rear diff oil change was at 30K.

1. Learned: don't refill too fast at the end or you'll have excess pouring...

3 Replies

3339 Views

Last post by Wiley
Sun Aug 06, 2017 9:25 pm
1993 RWD Astro rear end starting to go

Last post by Captn. Crunch « Thu Apr 06, 2017 5:46 am
Replies: 4
by BayAreaAstro » Fri Mar 31, 2017 2:06 pm

Hi there,

The rear end on my '93 is starting to go. Sounds like the brakes are grinding but they're new. The guys at the oil changing shop also tell...

4 Replies

3957 Views

Last post by Captn. Crunch
Thu Apr 06, 2017 5:46 am
Rear End Swap

Last post by Astrophysics « Sun Feb 19, 2017 11:36 am
Replies: 4
by dobaroy » Fri Feb 17, 2017 6:32 am

The rear end is gone in our '97 Astro (GU5) and we have a 03 Safari AWD rear end, can we swap this into the 97? Thanks

4 Replies

4340 Views

Last post by Astrophysics
Sun Feb 19, 2017 11:36 am
Drive shaft question

Last post by Stroverlander « Sat Nov 05, 2016 9:16 am
Replies: 7
by imncrxtc » Wed Nov 02, 2016 7:06 pm

Hi guys, im trying to help my old man out, and i believe ive come to the right place.
He has a 98 awd drive hes trying to get on the road....its...

7 Replies

4871 Views

Last post by Stroverlander
Sat Nov 05, 2016 9:16 am
rear end swap

Last post by doyoulikeithere « Sat Jul 23, 2016 7:00 pm
Replies: 2
by Dan » Tue Jul 19, 2016 8:20 pm

I have a 89 astro drum brakes carbon single leaf rear end. looking to swap out what years can be used and from what vehicle

2 Replies

3149 Views

Last post by doyoulikeithere
Sat Jul 23, 2016 7:00 pm
Bearing wont budge

Last post by Mmusicman « Tue Mar 15, 2016 7:15 am
Replies: 2
by RINNY » Fri Mar 11, 2016 2:45 pm

I have the G80 rear apart and I have a heavy duty slide hammer but I cannot get the axel bearing to budge. Even heated it a little. Any ideas?

2 Replies

2973 Views

Last post by Mmusicman
Tue Mar 15, 2016 7:15 am
HELP Pinion Yolk seal

Last post by Stroverlander « Tue Apr 07, 2015 2:32 pm
Replies: 10
by RINNY » Fri Apr 03, 2015 3:50 pm

Does any one know a number for the seal that goes in the pinion yolk on a 2004 G80 rear end?

10 Replies

6718 Views

Last post by Stroverlander
Tue Apr 07, 2015 2:32 pm
Thinking of installing a g80 to 2000 Safari AWD

Last post by zaneroni « Fri Nov 28, 2014 7:31 am
Replies: 2
by zaneroni » Thu Nov 27, 2014 10:07 am

Hi
I have been doing a lot of reading of different topics about adding limited slip to Astro's and to be honest I became more and more confused on...

2 Replies

3372 Views

Last post by zaneroni
Fri Nov 28, 2014 7:31 am
"Rear Axle" --New Bearing / Axlels Will Not Go In - HELP!!

Last post by LiftedAWDAstro « Sat Sep 06, 2014 5:47 am
Replies: 9
by T Lea » Mon Jul 14, 2014 5:28 am

1997 Astro AWD
I replaced the rear outer axle bearings. When I slide in the axles up to the bearing area, the axle will not go in. These axles are...

9 Replies

7304 Views

Last post by LiftedAWDAstro
Sat Sep 06, 2014 5:47 am
do i have an LSDiff or not ?

Last post by doyoulikeithere « Fri Jun 06, 2014 3:32 pm
Replies: 9
by stormblue » Thu Mar 14, 2013 6:39 am

1999 AWD
the only rpo code is the gu6 ..... so know i have 3.42 gear ratio.
but i don't have GQ1 or G80 in my rpo list.
apparently .....i do not...

9 Replies

6222 Views

Last post by doyoulikeithere
Fri Jun 06, 2014 3:32 pm
Changing axle seals and bearings...

Last post by skydog « Mon May 05, 2014 5:47 am
Replies: 15
by peppy » Wed Jul 23, 2008 10:31 am
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I'm thinking of changing rear differential fluid. As part of the process, it requires taking off the rear cover. And, I was thinking of changing the...
15 Replies

12449 Views

Last post by skydog
Mon May 05, 2014 5:47 am
put a torsen diff in my 99

Last post by LiftedAWDAstro « Mon Jan 27, 2014 5:19 am
Replies: 9
by Captn. Crunch » Mon Mar 25, 2013 10:27 am

I never liked having an AWD badge on the side of my Safari knowing what they really meant is mostly one wheel drive and sometimes two. I picked up a...

9 Replies

6212 Views

Last post by LiftedAWDAstro
Mon Jan 27, 2014 5:19 am
Play in rear universal joint

Last post by doyoulikeithere « Wed Sep 18, 2013 12:10 pm
Replies: 4
by thunderheart » Tue Sep 17, 2013 9:00 pm

My '94 cargo has a pretty ugly vibration that mostly occurs on down hills or coasting, but seems to go away when power is applied. Got under it and...

4 Replies

3762 Views

Last post by doyoulikeithere
Wed Sep 18, 2013 12:10 pm
Rear Axle Noise

Last post by 1Gary « Sat Sep 14, 2013 4:52 am
Replies: 2
by sstevecu » Fri Sep 13, 2013 7:13 pm

Noisy Rear axle. My 1997 Safari van had a noisy rear axle for the last 20 thousand miles so I decided to pull the cover and take a look. It is a 3.42...

2 Replies

3656 Views

Last post by 1Gary
Sat Sep 14, 2013 4:52 am
Bolt patterns-Ford 9" for Ole Yellar

Last post by 1Gary « Sat Aug 24, 2013 8:56 am
Replies: 12
by 1Gary » Mon Aug 12, 2013 4:01 am

When I do have the Ford 9 built for Ole Yellar because I can choose which bolt pattern and what flange for a conversion to what backing plate I...

12 Replies

7859 Views

Last post by 1Gary
Sat Aug 24, 2013 8:56 am
Hours to change axle bearings?

Last post by maestro « Thu May 16, 2013 4:39 pm
Replies: 2
by maestro » Thu May 16, 2013 3:23 pm

The GT4 / G80 rear end is making noise, sounds like axle bearings to me. Can anyone tell me how many hours it should take for a pro to change them...

2 Replies

3513 Views

Last post by maestro
Thu May 16, 2013 4:39 pm
can you swap axles 26 to 28 splines

Last post by v8famvan « Mon Apr 22, 2013 10:30 pm
Replies: 2
by mr horsepower » Mon Apr 15, 2013 12:38 pm

Hi
My axles are pitted and making noise
I have spare ones incl diff
Only the are 26 instead of 28 splines
Can i swap it incl the spiders
Does it...

2 Replies

3171 Views

Last post by v8famvan
Mon Apr 22, 2013 10:30 pm
your ideas on best all around rear axle gears

Last post by madslammer « Wed Mar 27, 2013 6:39 pm
Replies: 14
by markmitchinnh » Tue Dec 04, 2012 12:20 pm

I would like to know what you guys think about what the best all around gear ratio for traveling and general driving around.

14 Replies

8149 Views

Last post by madslammer
Wed Mar 27, 2013 6:39 pm
Rear Axle issues

Last post by LiftedAWDAstro « Fri Mar 22, 2013 5:45 am
Replies: 10
by djdonovan1 » Sat Mar 16, 2013 12:42 pm

Hey Guys,

I have a custom 97 GMC Safari that I do car shows with all over. My issue is the rear axle. First off, I do have an air suspension setup....

10 Replies

7500 Views

Last post by LiftedAWDAstro
Fri Mar 22, 2013 5:45 am
4.11's and G80 posi in 2005 AWD

Last post by LiftedAWDAstro « Thu Jan 10, 2013 6:43 pm
Replies: 31
by LiftedAWDAstro » Tue Jun 05, 2012 5:03 am
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Ever since I put 4.11's in the SPB back in 2003-4, every van I bought and kept for a while has had 4.10's. This 05 is no different. Going with 4.11's...
31 Replies

18145 Views

Last post by LiftedAWDAstro
Thu Jan 10, 2013 6:43 pm
Is this normal ?

Last post by doyoulikeithere « Fri Jan 04, 2013 6:48 pm
Replies: 23
by Vanboozin » Sun Dec 30, 2012 5:01 pm
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i have what seems to be alot of slack when i move my rear yoke by hand.
the pinion nut and shaft both move with the yoke, doesn't seem that the...
23 Replies

12319 Views

Last post by doyoulikeithere
Fri Jan 04, 2013 6:48 pm
Pinion Angle

Last post by doyoulikeithere « Mon Dec 03, 2012 7:53 pm
Replies: 4
by SnoDrtRider » Sun Nov 25, 2012 5:42 am

I did a search and came up blank...

I have a rumble (slight but annoying) at 50-55 MPH in my 95 AWD. I don't know if it was there before the lift or...

4 Replies

4468 Views

Last post by doyoulikeithere
Mon Dec 03, 2012 7:53 pm
Can I bolt up 1998 rear axle in a 2004 van...

Last post by LiftedAWDAstro « Sat Nov 10, 2012 10:54 am
Replies: 5
by Snowgeek » Thu Nov 08, 2012 10:19 pm

So i have found parts of this info posted in both axle posts and brake posts but no definitive answers so i apologize if it has been covered...

5 Replies

4467 Views

Last post by LiftedAWDAstro
Sat Nov 10, 2012 10:54 am
gear swap demystified

Last post by MountainManJoe « Fri Oct 26, 2012 2:51 am
Replies: 14
by photo_van » Thu Sep 13, 2012 8:08 am

At the risk of posting concurrently with Lifted (whom I owe great appreciation too), this is for those that have never had a diff apart, but for...

14 Replies

8496 Views

Last post by MountainManJoe
Fri Oct 26, 2012 2:51 am
Broken G80

Last post by photo_van « Thu Oct 25, 2012 6:54 pm
Replies: 24
by photo_van » Mon Aug 15, 2011 9:32 pm
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Well my locker hasn't been working for sometime. Took a look in there today, everything looked ok, but there was a 1/2 long chunk of metal stuck to...
24 Replies

14497 Views

Last post by photo_van
Thu Oct 25, 2012 6:54 pm
Richmond Gear's Powertrax

Last post by astrozam « Sun Sep 23, 2012 6:33 pm
Replies: 4
by JHenry45 » Wed Sep 19, 2012 6:00 pm

Has anyone on the board added the Richmond Gear Powertrax unit to their open differential?
How do you like it? How does it compare to the Eaton G80?...

4 Replies

4151 Views

Last post by astrozam
Sun Sep 23, 2012 6:33 pm
Ring & Pinion teeth count

Last post by Stroverlander « Sat Sep 22, 2012 2:42 pm
Replies: 22
by LaGrasta » Mon Sep 10, 2012 10:47 am
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What is the difference in teeth from a 3.24 and a 3.73? I did a quick search but no easy answer.

I bought and paid for mine to be swapped, but never...
22 Replies

12894 Views

Last post by Stroverlander
Sat Sep 22, 2012 2:42 pm
Differential cover

Last post by MountainManJoe « Tue Aug 28, 2012 9:00 am
Replies: 19
by MountainManJoe » Wed Nov 16, 2011 3:39 pm
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I'm considering buying an aftermarket diff cover. Every time I drag the rear over a rock or something, it starts to leak. Also, with all the rust...
19 Replies

10349 Views

Last post by MountainManJoe
Tue Aug 28, 2012 9:00 am
aerostar rearend?

Last post by Smiliesafari « Wed Jun 20, 2012 4:48 am
Replies: 13
by HotrodDaddy43 » Mon Jun 18, 2012 10:40 am

Has anyone ever looked in to using the 8.8 out of one of these? Yes you have to cut the brackets off and add the correct ones. but it seems to have...

13 Replies

8372 Views

Last post by Smiliesafari
Wed Jun 20, 2012 4:48 am
anyone know a lot about the rear axles?

Last post by LaGrasta « Wed Jun 06, 2012 11:58 am
Replies: 6
by markmitchinnh » Tue May 29, 2012 3:44 pm

I bought a G80 posi unit with no gears , the axle it came from was a 3:42 as is my stock open rear axle. Can I use my stock gears or are the gears...

6 Replies

4730 Views

Last post by LaGrasta
Wed Jun 06, 2012 11:58 am
Passenger axle tube leaking again

Last post by chesehd « Thu May 17, 2012 8:37 pm
Replies: 6
by chesehd » Mon Jun 29, 2009 8:08 pm

I replaced the bearing on the axle several years ago and all seemed well. I had a Haynes and between myself and a partner we did alright, or so I...

6 Replies

4811 Views

Last post by chesehd
Thu May 17, 2012 8:37 pm
Getting a strange bump on the road

Last post by 1Gary « Tue Mar 20, 2012 6:30 pm
Replies: 6
by chesehd » Thu Mar 15, 2012 7:52 pm

So this past weekend I've been rolling with the wifey and kids, picking up some pallets in the back of the 'stro. We're almost home, rolling along at...

6 Replies

4563 Views

Last post by 1Gary
Tue Mar 20, 2012 6:30 pm
rear end troubles

Last post by LiftedAWDAstro « Mon Feb 13, 2012 4:09 am
Replies: 32
by completetech » Tue Jan 17, 2012 6:57 am
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I know nothing about rear ends on vehicles, except that they are there. :muhaha:

So anyhow I am hoping for a little guidance or help as to where to...
32 Replies

16300 Views

Last post by LiftedAWDAstro
Mon Feb 13, 2012 4:09 am
diff rebuild

Last post by MountainManJoe « Thu Feb 02, 2012 2:31 am
Replies: 2
by mike4300 » Wed Feb 01, 2012 5:02 pm

just thought i would share some info, anybody having diff noise if youre near toledo,ohio there is a gentleman here that does all the local race car...

2 Replies

3614 Views

Last post by MountainManJoe
Thu Feb 02, 2012 2:31 am
Rear Disc Brake Axle Swap

Last post by Smiliesafari « Thu Nov 24, 2011 5:18 am
Replies: 13
by socalastro » Mon Aug 29, 2011 11:21 pm

Howdy. Got a question. Are there any rear axles out there that I can directly swap into my 97 LS 2wd that have disc brakes? My rearend began howling...

13 Replies

10078 Views

Last post by Smiliesafari
Thu Nov 24, 2011 5:18 am
Rear end is a what?

Last post by Merlin « Tue Sep 27, 2011 9:17 am
Replies: 16
by Merlin » Tue Sep 20, 2011 9:50 am
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I have been slowly working on my Astro van since health issues are with me for life it is going really slow. Right now it is on blocks and I am about...
16 Replies

11515 Views

Last post by Merlin
Tue Sep 27, 2011 9:17 am
G80 in 2000 Astro LS 2wd w/towing package?

Last post by Cobra « Fri Sep 09, 2011 7:56 pm
Replies: 1
by kenny johnson » Fri Sep 09, 2011 7:05 pm

I bought an Astro with hopes of converting it to 4x4. But it seems very costly to change the 2wd to 4wd. I might just stick to 2wd with a lift if...

1 Replies

3660 Views

Last post by Cobra
Fri Sep 09, 2011 7:56 pm
Gear whine?

Last post by Cobra « Fri Aug 19, 2011 10:18 am
Replies: 15
by Cobra » Wed Aug 17, 2011 1:10 pm
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I slapped in a new Zexel Torsen differential in my 98 I was under serious time restraints so i skipped the proper setup procedure (i know stupid eh?)...
15 Replies

9447 Views

Last post by Cobra
Fri Aug 19, 2011 10:18 am
stock differential on 1991 awd Safari

Last post by LiftedAWDAstro « Fri Jul 29, 2011 4:14 pm
Replies: 15
by gmcsasquatch » Tue Jul 26, 2011 9:56 pm
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Does anyone know what kind of differential the 1991 Safari AWD has. I just got a repair manual for it but it doesn't have any information on all...
15 Replies

9508 Views

Last post by LiftedAWDAstro
Fri Jul 29, 2011 4:14 pm
Astro/Safari rear end offset

Last post by 1Gary « Sun Jul 24, 2011 1:43 pm
Replies: 21
by 1Gary » Mon Jul 04, 2011 8:04 pm
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Admins/Mods-if you want to move this thread to the Ole Yellar build after some time that would be OK.I just wanted to illustrate by pictures the one...
21 Replies

11951 Views

Last post by 1Gary
Sun Jul 24, 2011 1:43 pm

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Chevy & GMC Vans

REAR AXLE / DRIVE SHAFT

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