Home » Public Forums » GMCnet » My Final Drive (has a wee bit of rust)
| My Final Drive [message #64295] |
Sat, 14 November 2009 21:06  |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Transmission guru's.
Looks like my 67 Eldo 3.21 drive unit got a little damp inside. Had some sludge on the pan, no oil, and the pan was loose. The gears are clean, but there is a tinge of rust color to it.
I have a seal kit from Manny, also sent him an email for advice, but you guys think this unit is worth using?
Three photos here:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=31643
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: [GMCnet] My Final Drive [message #64301 is a reply to message #64295] |
Sat, 14 November 2009 21:43  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Chris,
I'm probably demonstrating an acute grasp on the obvious with the following
responses.
The rust on the gears appears to be superficial; it'll get worn off pretty
quickly when you put the final drive into service.
The problem is the condition of the bearings and the planetary gear setup
inside the housing.
When you pull the seals out you'll be able to see the ends of the bearings
maybe they'll reveal a bit more.
Personally I'd open it up and if it looks good send it out to Manny for a
rebuild.
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Chris Choffat
Sent: Sunday, 15 November 2009 2:06 PM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] My Final Drive
Transmission guru's.
Looks like my 67 Eldo 3.21 drive unit got a little damp inside. Had some
sludge on the pan, no oil, and the pan was loose. The gears are clean, but
there is a tinge of rust color to it.
I have a seal kit from Manny, also sent him an email for advice, but you
guys think this unit is worth using?
Three photos here:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=31643
--
-Chr$: Perpetual SmartAss
77 Ex-Kingsley 455: The Engineer's Motorhome
Scottsdale, AZ
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] My Final Drive [message #64311 is a reply to message #64295] |
Sun, 15 November 2009 06:34 |
Steven Ferguson
Messages: 3447
Registered: May 2006
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Chris,
Absolutely. You cannot and will not find a stronger unit than the
full planetary '66 & '67 3.21 final drives. I doubt that the
condensation issues you see did any real damage. But on that same
note, since it is out, now is the time for a quick tear down,
inspection, and reseal.
On Sat, Nov 14, 2009 at 7:06 PM, Chris Choffat <cchoffataz@yahoo.com> wrote:
>
>
> Transmission guru's.
>
> Looks like my 67 Eldo 3.21 drive unit got a little damp inside. Had some sludge on the pan, no oil, and the pan was loose. The gears are clean, but there is a tinge of rust color to it.
>
> I have a seal kit from Manny, also sent him an email for advice, but you guys think this unit is worth using?
>
> Three photos here:
>
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=31643
> --
> -Chr$: Perpetual SmartAss
> 77 Ex-Kingsley 455: The Engineer's Motorhome
> Scottsdale, AZ
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: [GMCnet] My Final Drive [message #64330 is a reply to message #64315] |
Sun, 15 November 2009 09:37 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Hey Rob,
How about putting the 3.21 maintenance manual on Bdub's site??
J.R.
> Chris,
>
> I forgot to mention that if you decide to pull it down let me know
> and I'll
> email you a copy of the Maintenance Manual for the 3.21.
>
> Regards,
> Rob Mueller
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: My Final Drive [message #64333 is a reply to message #64295] |
Sun, 15 November 2009 09:47 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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| Chr$ wrote on Sat, 14 November 2009 21:06 |
Transmission guru's.
Looks like my 67 Eldo 3.21 drive unit got a little damp inside. Had some sludge on the pan, no oil, and the pan was loose. The gears are clean, but there is a tinge of rust color to it.
I have a seal kit from Manny, also sent him an email for advice, but you guys think this unit is worth using?
Three photos here:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=31643
|
If you think you want to have it reconditioned, there is a fella in St.Paul MN that rebuilds the 3.21. He has all of the tools (including the case spreader tool) seals and bearings needed to do the job and his work is top notch. His name is John Biwersi and can be reached at: jbiwersi@mac.com
John has done many 3.21's including the FD's that are in Dave Lensi's, Bob Drews,....and my coach. JFWIW
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] My Final Drive [message #64355 is a reply to message #64315] |
Sun, 15 November 2009 14:15 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Robert, that would be great! is it a softcopy?
I think it is just condensation, and here in AZ, that means not much. I may start on it today. It looks a wee bit different thatn the 3.07 that is shown in the manual for the Motorhome.
| Robert Mueller wrote on Sun, 15 November 2009 05:58 |
Chris,
I forgot to mention that if you decide to pull it down let me know and I'll
email you a copy of the Maintenance Manual for the 3.21.
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
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-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: [GMCnet] My Final Drive [message #64364 is a reply to message #64355] |
Sun, 15 November 2009 16:41 |
powerjon
Messages: 2446
Registered: January 2004
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Does require some special tools to work on the drive.
J.R. Wright
On Nov 15, 2009, at 3:15 PM, Chris Choffat wrote:
>
>
> Robert, that would be great! is it a softcopy?
>
> I think it is just condensation, and here in AZ, that means not
> much. I may start on it today. It looks a wee bit different thatn
> the 3.07 that is shown in the manual for the Motorhome.
>
>
> Robert Mueller wrote on Sun, 15 November 2009 05:58
>> Chris,
>>
>> I forgot to mention that if you decide to pull it down let me know
>> and I'll
>> email you a copy of the Maintenance Manual for the 3.21.
>>
>> Regards,
>> Rob Mueller
>> Sydney, Australia
>> AUS '75 Avion-The Blue Streak TZE365V100428
>> USA '75 Avion-Double Trouble TZE365V100426
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
> --
> -Chr$: Perpetual SmartAss
> 77 Ex-Kingsley 455: The Engineer's Motorhome
> Scottsdale, AZ
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] My Final Drive [message #64365 is a reply to message #64355] |
Sun, 15 November 2009 16:51 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Chris,
I have emailed a soft copy ;-) to you off net.
John,
I sent a copy to Billy Massey and Gene Fisher too.
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Chris Choffat
Sent: Monday, 16 November 2009 7:16 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] My Final Drive
Robert, that would be great! is it a softcopy?
I think it is just condensation, and here in AZ, that means not much. I may
start on it today. It looks a wee bit different thatn the 3.07 that is shown
in the manual for the Motorhome.
--
-Chr$: Perpetual SmartAss
77 Ex-Kingsley 455: The Engineer's Motorhome
Scottsdale, AZ
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] My Final Drive [message #64367 is a reply to message #64365] |
Sun, 15 November 2009 17:27 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Senior Member |
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Gahh! I realized you said email after I hit send!
Looks like this one comes apart a bit differently than the 3.07. It's not readily apparant how the LH flange comes off, unless I need a 5/16-24 threaded bolt to use as a jack screw...
I'll peruse the service manual.
Thanks!
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: [GMCnet] My Final Drive [message #64374 is a reply to message #64367] |
Sun, 15 November 2009 17:44 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Chris,
Oh, I just figured you were living up to your signature! ;-)
Go through the manual carefully; I vaguely remember someone telling me that
you had to have needed special tools to reassemble it.
Better yet call Manny and ask him!
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Chris Choffat
Sent: Monday, 16 November 2009 10:28 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] My Final Drive
Gahh! I realized you said email after I hit send!
Looks like this one comes apart a bit differently than the 3.07. It's not
readily apparant how the LH flange comes off, unless I need a 5/16-24
threaded bolt to use as a jack screw...
I'll peruse the service manual.
Thanks!
--
-Chr$: Perpetual SmartAss
77 Ex-Kingsley 455: The Engineer's Motorhome
Scottsdale, AZ
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: My Final Drive [message #64379 is a reply to message #64295] |
Sun, 15 November 2009 19:08 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Senior Member |
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Hi Rob, it didn't come through yet. Did you send it to chris_choffat at cox dot net?
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: [GMCnet] My Final Drive [message #64381 is a reply to message #64379] |
Sun, 15 November 2009 19:24 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Chris,
I deleted it already so I don't know if I sent it to Cox or Yahoo.
I've prepared another copy and will send it to both of your email addresses,
however, before I do I wanted to mention that it is 4 MB in case that's why
it didn't come through.
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Chris Choffat
Sent: Monday, 16 November 2009 12:09 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] My Final Drive
Hi Rob, it didn't come through yet. Did you send it to chris_choffat at cox
dot net?
--
-Chr$: Perpetual SmartAss
77 Ex-Kingsley 455: The Engineer's Motorhome
Scottsdale, AZ
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] My Final Drive [message #64405 is a reply to message #64375] |
Sun, 15 November 2009 21:44 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma: 0
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[quote
I will send you a copy of the 3.21 final drive off net so you can see what
it looks like. It has an explanation of how it works as well.
[/quote]
thanks but someone has already done that. interesting design. i've messed with cars all my life and never saw that before.
Fred V
'77 Royale RB 455
P'cola, Fl
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| Re: My Final Drive [message #64406 is a reply to message #64295] |
Sun, 15 November 2009 21:47 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Senior Member |
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Ahh. pls send to the cox address. the yahoo probably bounced it.
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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