Final Drive Coughing Up Gear Oil

[Chazzer]

Jim K,
Thanks for the reply. You are correct on both observations. I am wasting my time and I do not have the knowledge on the venting of the
final drive.

I did a nut and bolt restoration on this car and went over and rebuilt all the major components of it. I took the final drive and trans to a
professional shop for them to go over and reseal. I did this because I lacked the time, tools and knowledge to do it myself.

I am now wasting a pile of my time trying to understand why a unit I sent out to professionals is now leaking. They obviously do not have an
understanding on proper venting of the final drive either.

At the end of the day the OE cover should work as required without having to monkeying around. I went down the road of an improper gasket hoping that
would be a quick and easy fix.

I now know that is not the problem. Your prior post in this thread explaining of the left handed vented seals has given me another situation to
contemplate.

I appreciate your offer for a chat. I will definitely give you a call next week.

Cheers, Jim
--
Jim Owens,

78 Royale,

Out skirts of Kitchener, Ontario

 

[Jim Hupy]

J.R. you could very well be absolutely correct. I have a transmission out
of a early Eldorado, complete with final drive and engine, and it does not
have the hose vent. I have seen several final drives from unknown donor
vehicles that had the iron case drilled and tapped and fitted with tubing.
Those did not look factory. I just "assumed" that was an owner added fix.
Jim Hupy
Salem, Or.

On Sun, Jun 16, 2019, 7:12 AM Jim via Gmclist
wrote:

> Jim K,
> Thanks for the reply. You are correct on both observations. I
> am wasting my time and I do not have the knowledge on the venting of the
> final drive.
>
> I did a nut and bolt restoration on this car and went over and rebuilt all
> the major components of it. I took the final drive and trans to a
> professional shop for them to go over and reseal. I did this because I
> lacked the time, tools and knowledge to do it myself.
>
> I am now wasting a pile of my time trying to understand why a unit I sent
> out to professionals is now leaking. They obviously do not have an
> understanding on proper venting of the final drive either.
>
> At the end of the day the OE cover should work as required without having
> to monkeying around. I went down the road of an improper gasket hoping that
> would be a quick and easy fix.
>
> I now know that is not the problem. Your prior post in this thread
> explaining of the left handed vented seals has given me another situation to
> contemplate.
>
> I appreciate your offer for a chat. I will definitely give you a call next
> week.
>
> Cheers, Jim
> --
> Jim Owens,
>
> 78 Royale,
>
> Out skirts of Kitchener, Ontario
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[jim kanomata1]

I know they had the blowing out the gear lub on the Toro and Eldo earlier.
The dealer fix was to install a vent on the cover.
Also the factory lowered the oil fill by roughly 1" .
So if you have the correct cover, correct gasket , and correct left
seal,you should not have any issue.
The correct gasket must be used with minimal sealant as the sealant will
block the vent. The seal on the driver has 2 holes and a baffle.

On Sun, Jun 16, 2019 at 10:22 AM James Hupy via Gmclist <

> J.R. you could very well be absolutely correct. I have a transmission out
> of a early Eldorado, complete with final drive and engine, and it does not
> have the hose vent. I have seen several final drives from unknown donor
> vehicles that had the iron case drilled and tapped and fitted with tubing.
> Those did not look factory. I just "assumed" that was an owner added fix.
> Jim Hupy
> Salem, Or.
>
> On Sun, Jun 16, 2019, 7:12 AM Jim via Gmclist

>
> > Jim K,
> > Thanks for the reply. You are correct on both observations. I
> > am wasting my time and I do not have the knowledge on the venting of the
> > final drive.
> >
> > I did a nut and bolt restoration on this car and went over and rebuilt
> all
> > the major components of it. I took the final drive and trans to a
> > professional shop for them to go over and reseal. I did this because I
> > lacked the time, tools and knowledge to do it myself.
> >
> > I am now wasting a pile of my time trying to understand why a unit I sent
> > out to professionals is now leaking. They obviously do not have an
> > understanding on proper venting of the final drive either.
> >
> > At the end of the day the OE cover should work as required without
> having
> > to monkeying around. I went down the road of an improper gasket hoping
> that
> > would be a quick and easy fix.
> >
> > I now know that is not the problem. Your prior post in this thread
> > explaining of the left handed vented seals has given me another
> situation to
> > contemplate.
> >
> > I appreciate your offer for a chat. I will definitely give you a call
> next
> > week.
> >
> > Cheers, Jim
> > --
> > Jim Owens,
> >
> > 78 Royale,
> >
> > Out skirts of Kitchener, Ontario
> >
> > _______________________________________________
> > 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
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502

 

[john biwersi]

Gentlemen, The 1968 Tornado and Eldorado was the first production year utilizing a spider gears type differential for the front wheel drive
vehicles. The initial final drive cover for some of these vehicles had a vent pipe on the passenger side of the cover and the fill hole was at the
same level as the 66 and 67 planetary final drives. At some point in time, GM changed the design of these covers by developing the 2 piece gasket
for venting and they lowered the fill hole by approximately 1". They stayed with these arrangements through the 1978 front wheel vehicles. Since your
car is a 1968, you may have a cover that has the vent pipe and the higher level fill plug. If you have the early design and you want to keep it
absolutely original, then make yourself a dipstick such that you can measure the level oil and fill it 1" below the bottom of the fill hole. If you do
not need to keep your vehicle absolutely original, then you can get any 69-78 Tornado or Eldorado final drive cover and the 2 piece gasket and your
final drive oil should stop blowing out the vent. As a side bar, I have found that lowering the 3.21 planetary final drive oil level to match the
same level as the 68-78 final drives helps prevent the oil blowing issue.