Home » Public Forums » GMCnet » [GMCnet] New bees and others on the Final Drive lube
| [GMCnet] New bees and others on the Final Drive lube [message #316460] |
Sat, 22 April 2017 15:15  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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I very seldom hear that owns have changed the FD lube. I change mine every 30,000 miles. That comes out to every other trans fluid/ filter change. Oils cheep. After getting the trans in Barb's 73 GMC. I pulled the FD cover off at the end of the day so it could drip all night. And that it did. The gear lube came out like maple syrup on a 10 degree Winter day in Iowa. 14 hours later. Still slowly dripping. And way be on black. It had mineral base lube in it. Can't get it all out. So I stayed with it. It did the job for 44 years, and 200,000 miles. No reason to change at this point. Personally. I wouldn't change to synthetic unless you can clean ALL the old lube out for sure. So. When was your FD lube changed? If you change the lube. Check with those here about the special gasket with the vent passages. Then how to find/clean the tiny hole in the cover. You need no mechanical skills to do this task. 1/2" socket or wrench, drain container, spray gasket adhesive, scraper of some kind/ single edge razor blade, a solvent to clean gasket area, and 2 qts of gear lube. Bob Dunahugh
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| Re: [GMCnet] New bees and others on the Final Drive lube [message #316467 is a reply to message #316460] |
Sat, 22 April 2017 22:23  |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Might want to add a oil drain plug to make the next oil change easy and
quicker.
On Sat, Apr 22, 2017 at 2:15 PM, Bob Dunahugh wrote:
> I very seldom hear that owns have changed the FD lube. I change mine
> every 30,000 miles. That comes out to every other trans fluid/ filter
> change. Oils cheep. After getting the trans in Barb's 73 GMC. I pulled the
> FD cover off at the end of the day so it could drip all night. And that it
> did. The gear lube came out like maple syrup on a 10 degree Winter day in
> Iowa. 14 hours later. Still slowly dripping. And way be on black. It had
> mineral base lube in it. Can't get it all out. So I stayed with it. It did
> the job for 44 years, and 200,000 miles. No reason to change at this
> point. Personally. I wouldn't change to synthetic unless you can clean
> ALL the old lube out for sure. So. When was your FD lube changed? If you
> change the lube. Check with those here about the special gasket with the
> vent passages. Then how to find/clean the tiny hole in the cover. You need
> no mechanical skills to do this task. 1/2" socket or wrench, drain
> container, spray gasket adhesive, scraper of some kind/ single edge razor
> blade, a solvent to clean gasket area, and 2 qts of gear lube. Bob Dunahugh
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] New bees and others on the Final Drive lube [message #316472 is a reply to message #316460] |
Sun, 23 April 2017 07:11 |
bobby5832708
Messages: 237
Registered: November 2006
Location: Winter Springs FL
Karma: 3
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Bob,
I change the FD oil about every 2 years. On my GMC it's really easy because of several mods:
1. I put on a Ragusa cover that has a drain plug. Really easy to drain the oil.
2. I do not use that gasket with the hokey vent. I RTV'ed the cover on, adapted a 1/4 hose barb to where the fill plug is screwed in to (just standard brass fittings IIRC), and ran a 1/4" hose up to a pint catch can mounted to the edge of the a/c evap housing under the left hood. Using another brass fitting I made a filtered vent that screws into the top of the catch can. This way the venting is way up off the ground, not down near the road where the water is. Now I don't get water into the FD through a low-mounted vent hole when crashing huge puddles or driving on I-275 during a major storm when there is 4 inches of water on the roadway and I'm going too fast and throwing a huge rooster tail of water (the GMC can throw a bigger rooster tail than any vehicle I've ever owned). The catch can allows me to really fill (overfill) the FD and the expanding excess oil has somewhere to go.
Also, refilling the drained FD is easy. I put a pint of oil into the catch can, wait a few hours for the oil to run down to the FD, put in another pint, repeat until I've put in about 5 pints. If I needed to fill the FD in a hurry I can unscrew the fitting at the fill plug and put all the oil in there the normal way. I'm just never in a hurry so I do it the easy way from the top.
I've been running this on the original 3.07 FD for just over 10 years now with the exception of a couple of years when I had a 3.21 FD installed (I rigged the catch can to the 3.21's fill plug too, just a different size fitting). I put the 3.07 back in because it's better for what I need. It still works fine and doesn't make any noise with about 130K miles on it.
For the gear oil, some have said to use 80W-90 and others have said to use 85W-140. I compromised and use about half of each. Nothing special, Walmart's house brand seems to work fine and is priced right.
As usual, YMMV, JWID, IYDWIDYDME (if you do what I did your diff may explode).
Bob Heller
2017 Winnebago 29VE
Winter Springs FL
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| Re: [GMCnet] New bees and others on the Final Drive lube [message #316532 is a reply to message #316531] |
Mon, 24 April 2017 08:50 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Matt,
I don't understand the fix you did.
when you say 'coined' is that just making a dent in the gasket??
________________________________
From: Gmclist on behalf of Matt Colie
Sent: Monday, April 24, 2017 8:44:57 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] New bees and others on the Final Drive lube
I have some very special concern here.
When I last bought a final drive gasket, it came in a Fel-Pro package, but it was partly made on the aftermarket tool that was mine at McCord. I say
partly because the parts that my group shipped had the vent coined into on of the two layers of the gasket. So, I got out a piece of wire and an
hammer and coined the slot myself.
I have no clue what a normal human might do in this case.
Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Still Loving OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] New bees and others on the Final Drive lube [message #316533 is a reply to message #316532] |
Mon, 24 April 2017 09:16 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Keith V wrote on Mon, 24 April 2017 09:50Matt,
I don't understand the fix you did.
when you say 'coined' is that just making a dent in the gasket??
=> Yes, that is what I did. This has to be done carefully or the gasket material will crack. While that may not actually matter to function, we had to reject the cracked parts as loose paper chips were not allowed.
Matt
Subject: Re: [GMCnet] New bees and others on the Final Drive lube
I have some very special concern here.
When I last bought a final drive gasket, it came in a Fel-Pro package, but it was partly made on the aftermarket tool that was mine at McCord. I say
partly because the parts that my group shipped had the vent coined into on of the two layers of the gasket. So, I got out a piece of wire and an
hammer and coined the slot myself.
I have no clue what a normal human might do in this case.
Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Still Loving OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit
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Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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