| Final Drive ( 3.21 ) Gear Oil Capacity [message #307412] |
Mon, 19 September 2016 15:03  |
larry.whisler
Messages: 356
Registered: August 2005
Karma: 8
|
Senior Member |
|
|
I just finished installing a 3.21 final drive in the coach.
What is the capacity of the 3.21 final drive?
I checked the 67 Olds Toronado manual on the 3.21 and it states 4 1/2 pints
and I thought that I had read somewhere out here on the forum that the
3.21 final drive should not be filled to the hole in the cover but rather
the fluid should be an inch or two below the hole.
So I add two quarts of gear lube and just as I am finishing up the second quart
it starts running out the hole.
Am I missing something? or is the manual a misprint? The drive was completely empty
when I installed it.
larry
|
|
|
|
| Re: [GMCnet] Final Drive ( 3.21 ) Gear Oil Capacity [message #307414 is a reply to message #307412] |
Mon, 19 September 2016 15:51  |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
|
Senior Member |
|
|
Larry:
I filled the 3.70 in my coach to the hole.
I don’t know for certain if that’s right, so I’m going to follow what you learn here.
Dolph
DE N8JPC
Wheeling, West Virginia
1977 26’ ex-PalmBeach
1-Ton, Sullybilt Bags, Reaction Arms, 3.70 LSD, Manny Transmission, EV-6010
“The Aluminum and Fiberglass Mistress"
> On Sep 19, 2016, at 4:03 PM, larry.whisler wrote:
>
> I just finished installing a 3.21 final drive in the coach.
>
> What is the capacity of the 3.21 final drive?
>
> I checked the 67 Olds Toronado manual on the 3.21 and it states 4 1/2 pints
> and I thought that I had read somewhere out here on the forum that the
> 3.21 final drive should not be filled to the hole in the cover but rather
> the fluid should be an inch or two below the hole.
>
> So I add two quarts of gear lube and just as I am finishing up the second quart
> it starts running out the hole.
>
> Am I missing something? or is the manual a misprint? The drive was completely empty
> when I installed it.
>
> larry
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
|
|
|
|
| Re: Final Drive ( 3.21 ) Gear Oil Capacity [message #307429 is a reply to message #307412] |
Mon, 19 September 2016 18:00 |
jhb1
Messages: 303
Registered: February 2004
Karma: 0
|
Senior Member |
|
|
Hi Larry when I changed the fluid on mine I used a little less than 2 quarts there is about an inch and a half left in the second bottle when it started to flow out.. Takes awhile to settle out when filling
HTH
John H. Bell
77 Royale; QuadBag,Manny OneTon,Honda EV4010, FITech
Montreal Qc.
|
|
|
|
|
|
|
|
|
|
|
|
| Re: [GMCnet] Final Drive ( 3.21 ) Gear Oil Capacity [message #307470 is a reply to message #307452] |
Tue, 20 September 2016 09:08 |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
|
Senior Member |
|
|
Thanks. I see that now (I knew there was a reason to have that Oldsmobile manual).
Dolph
DE N8JPC
Wheeling, West Virginia
1977 26’ ex-PalmBeach
1-Ton, Sullybilt Bags, Reaction Arms, 3.70 LSD, Manny Transmission, EV-6010
“The Aluminum and Fiberglass Mistress"
> On Sep 20, 2016, at 12:59 AM, Rob Mueller wrote:
>
> Dolph,
>
> The case on a 3.21 t0 1 is a planetary gear FD and the case is smaller.
>
> Regards,
> Rob M.
> USAussie - Downunder
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Dolph Santorine
> Sent: Tuesday, September 20, 2016 6:52 AM
> To: GMC List
> Subject: Re: [GMCnet] Final Drive ( 3.21 ) Gear Oil Capacity
>
> Larry:
>
> I filled the 3.70 in my coach to the hole.
>
> I don't know for certain if that's right, so I'm going to follow what you learn here.
>
> Dolph
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
|
|
|
|
| Re: Final Drive ( 3.21 ) Gear Oil Capacity [message #307514 is a reply to message #307412] |
Tue, 20 September 2016 20:31 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
|
Senior Member |
|
|
Larry, The first year I ran my 3.21, if I filled it to the fill hole, it would spit out about 1" of fluid. Then I tried running it 1" low and it never spit out any more fluid. Been running it that way since 2005 with no issues. Just make sure the vent, which is located in the center of the left side output shaft plate is not plugged. See this:
http://www.gmcmhphotos.com/photos/fd-visual-differences307-vs-321/p16034.html
and even the rest of the photos in that album for some information on the 3.21.
Bend a 12ga wire at a 90* angle and mark it at 1". The insert in the fill hole and fill to 1" below the fill hole. No need to run another vent up into the engine compartment like some have done. If to full it will still spit it out that high vent. JWID
HTH
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
