| 3.21 [message #200019] |
Tue, 26 February 2013 19:54  |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Senior Member |
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Anyone else here have a 3.21? Is yours noisy when cold? It has a planetary gearset, so there is more going on. warms up and noise goes away.
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: [GMCnet] 3.21 [message #200022 is a reply to message #200019] |
Tue, 26 February 2013 20:00  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Chris,
I have had one in Double Trouble for three summer tours (~15,000 miles) and I can't here it at all.
Regards,
Rob M.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Chris Choffat
Sent: Wednesday, February 27, 2013 12:54 PM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] 3.21
Anyone else here have a 3.21? Is yours noisy when cold? It has a planetary gearset, so there is more going on. warms up and noise
goes away.
--
-Chr$: Perpetual SmartAss
Scottsdale, AZ
"The Escape Pod" A 77 Ex-Kingsley Featuring: Olds 455, Manny Power Drive, 3:21, Rockwell, Jim B QJET, Quadra bag. Still needs
paint!
Photosite: Chrisc "It has Begun"
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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: 3.21 [message #200030 is a reply to message #200019] |
Tue, 26 February 2013 20:40 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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Senior Member |
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What do you think of the 3.21. I signed up to buy the 3.45 that Bob Dunahugh listed this morning but when he discovered it was a 3.21 (with the axle). He agreed to let me think on it a few days.
The price on the 3.21 is good but I'm wondering if it is worth the effort to go from a 3.07 to a 3.21? Did you guys see a noticeable improvement?
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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| Re: [GMCnet] 3.21 [message #200038 is a reply to message #200030] |
Tue, 26 February 2013 20:57 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Kerry,
I've never had a 3.21, so I'm speaking from hearsay, but I'd definitely
take the 3.21. It's reportedly "bullet proof" and an engineering marvel.
If it proves to be a lower ratio than you'd really like, then when you do,
for whatever reason, pull the transmission, just install Manny's 3.50 chain
drive, yielding an overall 3.67 -- reportedly the "ideal ratio".
Remember that you MUST have the 3.21 right stub axle and support.
However, again from others' advice, you shouldn't just pop the 3.21 in:
There are a couple of bearings that need attention, and perhaps some other
minor parts. We have a 3.21 guru, whose name went CRS on me for the
moment, who'll help. Somebody refresh me!
Ken H.
On Tue, Feb 26, 2013 at 9:40 PM, Kerry Pinkerton wrote:
>
>
> What do you think of the 3.21. I signed up to buy the 3.45 that Bob
> Dunahugh listed this morning but when he discovered it was a 3.21 (with the
> axle). He agreed to let me think on it a few days.
>
> The price on the 3.21 is good but I'm wondering if it is worth the effort
> to go from a 3.07 to a 3.21? Did you guys see a noticeable improvement?
> --
>
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Ken Henderson
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www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] 3.21 [message #200050 is a reply to message #200038] |
Tue, 26 February 2013 22:02 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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| Ken Henderson wrote on Tue, 26 February 2013 20:57 |
We have a 3.21 guru, whose name went CRS on me for the
moment, who'll help. Somebody refresh me!
Ken H.
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Ken...
from an old post by Larry...
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
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] 3.21 [message #200075 is a reply to message #200050] |
Wed, 27 February 2013 06:53 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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| Dennis S wrote on Tue, 26 February 2013 22:02 |
| Ken Henderson wrote on Tue, 26 February 2013 20:57 |
We have a 3.21 guru, whose name went CRS on me for the
moment, who'll help. Somebody refresh me!
Ken H.
|
Ken...
from an old post by Larry...
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
Dennis
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Yup, John is the man. For those of you that would like to get the 3.21 and don't have one to rebuild. John has cores that he rebuilds for sale. Just contact him at the email above. Here are the differences between the 3.21 and the others out there:
http://www.gmcmhphotos.com/photos/g4399-fd-visual-differences-3-07-vs-3-21.html
You will not notice much difference when driving between the 3.08 and the 3.21 accept that by design it has a tendency to act like a posi FD.
I also would not just pop it in. Who knows what went on inside that thing in the last 30 some years before you got it. John can rebuild it for you. If you decide to buy it and want it rebuilt, get it to Dothan. I can then transport it to John for you, saving a lot on shipping. Then can bring it back to you at the fall convention if you think you can wait that long.
John does GOOD work on a great FD.
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] 3.21 [message #200100 is a reply to message #200075] |
Wed, 27 February 2013 12:21 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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Did anyone pipe up on the value of a 3.21 with shafts? Curious as I believe the Pig has that in it now with an aluminum cover. I ordered a 355 lim slip from Jim K and will likely want to sell my drive to mitigate the $$$
Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: 3.21 [message #200102 is a reply to message #200019] |
Wed, 27 February 2013 12:32 |
Cadillackeeper
Messages: 464
Registered: October 2012
Location: Fort Lauderdale
Karma: 1
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I would love to have that!!I drive a 67 Eldorado Everyday!The swich pitch convertor compliments the drive as well don't forget!!
77 455 Elaganza II and 67 Animal, Built 500 Powered Eldo
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| Re: 3.21 [message #200103 is a reply to message #200019] |
Wed, 27 February 2013 12:40 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Personally I like the 3.07 on the highway. It's in the city and on grades would like something around 3.42. Depends on your tire size, weight and how fast you tend to cruise long term. I think a 3.21 would work for me.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] 3.21 [message #200123 is a reply to message #200038] |
Wed, 27 February 2013 16:40 |
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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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Ken,
When the Paterson engine for Double Trouble gets put back together it's going to turn the front wheels through a switch pitch built
by Manny that has the 3.50 chain drive (Power Drive) installed.
Regards,
Rob M.
-----Original Message-----
From: Ken Henderson
Kerry,
I've never had a 3.21, so I'm speaking from hearsay, but I'd definitely
take the 3.21. It's reportedly "bullet proof" and an engineering marvel.
If it proves to be a lower ratio than you'd really like, then when you do,
for whatever reason, pull the transmission, just install Manny's 3.50 chain
drive, yielding an overall 3.67 -- reportedly the "ideal ratio".
Remember that you MUST have the 3.21 right stub axle and support.
However, again from others' advice, you shouldn't just pop the 3.21 in:
There are a couple of bearings that need attention, and perhaps some other
minor parts. We have a 3.21 guru, whose name went CRS on me for the
moment, who'll help. Somebody refresh me!
Ken H.
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Unsubscribe or Change List Options:
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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] 3.21 [message #200135 is a reply to message #200100] |
Wed, 27 February 2013 18:15 |
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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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Sully,
Count the number of bolts that hold that aluminum cover on, if it's 8 you've got a 3.21 if it's 10 you've got a 3.07 (or possibly an
aftermarket ratio).
Here's a photo that LarryW has on the PhotoSite.
http://www.gmcmhphotos.com/photos/fd-visual-differences-3-07-vs-3-21/p16025.html
AFAIK there are no other ratios available for the 3.21.
Here's my experience as far as value goes.
I have two switch pitch transmissions and 3.21 final drives:
The first pair I purchased from Bob Sobrito which he had been told was rebuilt. Unfortunately I can't remember what I paid him for
it as it was in 2007. Because it was going to Australia they were both sent down to Manny's to be checked over. When Manny tore it
down he noted that the rebuild was OK, but lacked the mods he does. When he finished rebuilding it he put it on his test stand and
when he hit the "switch" button nothing happened. Turns out the first rebuilder installed a non-switch pitch torque converter. The
tranny was re-rebuilt at a cost of $885 including a new switch pitch torque convertor. The final drive was torn down and checked,
new seals installed at a cost of $200.
The second pair I bought off eBay for $200.00.
JohnS and I checked the 3.21 following JohnB's instructions and replaced one seal, can't remember what it cost.
The tranny went to Manny for a rebuild and incorporation of the Power Drive. That came to $1767.
Regards,
Rob M.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of sgltrac
Did anyone pipe up on the value of a 3.21 with shafts? Curious as I believe the Pig has that in it now with an aluminum cover. I
ordered a 355 lim slip from Jim K and will likely want to sell my drive to mitigate the $$$
--
Sully
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Unsubscribe or Change List Options:
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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] 3.21 [message #200138 is a reply to message #200135] |
Wed, 27 February 2013 19:03 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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Mine is a 3.21 then judging by the photos
Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: 3.21 [message #200388 is a reply to message #200019] |
Sat, 02 March 2013 19:53 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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No Message Body
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: 3.21 [message #200419 is a reply to message #200019] |
Sun, 03 March 2013 00:16 |
Cadillackeeper
Messages: 464
Registered: October 2012
Location: Fort Lauderdale
Karma: 1
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Senior Member |
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You have to admit,Those GM guys who came up with what I call a "Softball" were brilliant.Huh?
77 455 Elaganza II and 67 Animal, Built 500 Powered Eldo
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| Re: 3.21 [message #200450 is a reply to message #200019] |
Sun, 03 March 2013 09:42 |
Cadillackeeper
Messages: 464
Registered: October 2012
Location: Fort Lauderdale
Karma: 1
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Senior Member |
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Thats what I always have called that little differential,"Final Drive"
77 455 Elaganza II and 67 Animal, Built 500 Powered Eldo
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