Home » Public Forums » GMCnet » Jacking and Jack Stands
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| Re: Jacking and Jack Stands [message #302502 is a reply to message #302501] |
Tue, 21 June 2016 19:10   |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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For what it's worth I never lift the front for oil , filter or grease. Just slide under on cardboard. From front for oil plug. From just behind RF tire for filter and every which way from front to hit all fittings
That jack hook drawing shows a double use for front I did not know about. I have the blue one and don't know it it fits that way, plus I never jack only one side.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Jacking and Jack Stands [message #302503 is a reply to message #302501] |
Tue, 21 June 2016 19:19 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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John,
I have one of those bottle jack adapter gizmos, but have only ever used it once or twice. I generally use my 3-1/2 ton floor jack to jack my coach up, or just drive it up some wooden ramps to work under the front end. Jack stands are a must for safety.
As a general rule, you should jack the front end from the middle of the main front cross member, directly under the front motor mount. It is said that you can crack the windshields (mostly on earlier coaches) if you torque the body too uch by jacking on one side or the other. Generally, if you just need to get a wheel off the ground, it is okay to jack it up under the lower control arm, as close to the ball joint as possible.
Whenever I jack up the rear, I place my floor jack under the 'bogey' frame to lift one side at a time. I ten place jack stands under the frame in front of, AND behind the wheels, where the frame is doubled up. It is very heavy from any of those three points. The front end weighs about 4,000 lbs and each side of the rear weighs about that as well.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Jacking and Jack Stands [message #302508 is a reply to message #302501] |
Tue, 21 June 2016 19:50 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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John,
The jack hook you have is a unique design; most are usable only on the rear
bogies -- they don't have the extension which can be used for the front.
Since you have that, you certainly can use it for the front, but I don't
recommend it. It's easier, especially if you have a floor jack, to lift
under the front (actually, second, or main) crossmember -- the big,curved
bottom one you see just forward of the engine. That gets both sides of the
coach up at one time, eliminating even the possibility of a body torque
induced windshield crack. Those DO happen -- I did it to my '76, tho' only
by leaving it in a severely asymmetrical position for several days. There
are two holes in the bottom of that main crossmember; half way between them
is the exact lateral center of the coach -- that's where I jack.
However you get the front end up, DO use sturdy jack stands. Some put them
beneath each end of the main crossmember; I prefer to put them beneath the
joint where the front frame clip is bolted to the straight side rails --
right where your second illustration shows your jack hook positioned.
Ken H.
On Tue, Jun 21, 2016 at 8:02 PM, John O'Reilly
wrote:
> I'm going to change the oil tomorrow. After that I figured I'd grease the
> front end so I wanted to put it up on jack stands. I have a couple of floor
> jacks and bottle jacks. The GMC came with an adaptor gizmo and a hand
> drawing of how to use it (see photos from photo site). Is this the common
> way
> of doing it? Just want to get it up in the air and on jack stands. Thanks.
> jor
>
>
> http://s102.photobucket.com/user/joroiga/media/bottle%20jack%20adaptor1_zps5fnudk8i.jpeg.html
>
>
> http://s102.photobucket.com/user/joroiga/media/bottle%20jack%20adaptor2_zps0tyamt5j.jpeg.html
> --
> John O'Reilly
> 76 Eleganza II (quad bags, disc brakes w/ reaction arm. 3.70 gears, manny
> trans, headers, Patterson dist.)
> Tucson, AZ
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Jacking and Jack Stands [message #302509 is a reply to message #302502] |
Tue, 21 June 2016 20:10 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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John,
Thanks a lot!
You can slide under there no problem that sure hurts the feelings of fat buggers like me! :-(
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 John R. Lebetski
Sent: Wednesday, June 22, 2016 10:11 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Jacking and Jack Stands
For what it's worth I never lift the front for oil , filter or grease. Just slide under on cardboard. From front for oil plug.
From just behind RF tire for filter and every which way from front to hit all fittings
That jack hook drawing shows a double use for front I did not know about. I have the blue one and don't know it it fits that way,
plus I never jack only one side.
--
John Lebetski
Woodstock, IL
77 Eleganza II
Source America First
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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] Jacking and Jack Stands [message #302510 is a reply to message #302509] |
Tue, 21 June 2016 20:20 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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You can always use a set of the plastic ramps to provide extra clearance under the front of the coach. Then slide under. If you remove a wheel, slide it under the frame to act as a final stop, if your jack stands fail.
Tom MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: Jacking and Jack Stands [message #302512 is a reply to message #302511] |
Tue, 21 June 2016 20:44 |
jor
Messages: 43
Registered: June 2016
Location: Tucson
Karma: 0
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Thanks, guys. Just the info I was looking for. I usually drive a vehicle up on boards to change the oil but I like it hanging when I do a grease job. As you all recommend, I ALWAYS use jack stands and I'm going to lift from the middle. Another question: Is there a drawing showing all the grease points? I got a pile of documentation with the GMC but I'm having trouble finding some information. I joined GMCMI and am getting the USB drive with all the manuals on it so that should help.
jor
John O'Reilly
76 Eleganza II (quad bags, disc brakes w/ reaction arm. 3.70 gears, manny trans, headers, Patterson dist.)
Tucson, AZ
[Updated on: Tue, 21 June 2016 20:49] Report message to a moderator |
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| Re: Jacking and Jack Stands [message #302514 is a reply to message #302512] |
Tue, 21 June 2016 21:28 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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John
If you have not already done so - I encourage you to contact Steve F in Sierra Vista. He was the craftsman/owner who built your coach.
I don't know what may have happened to it during the two POs since. It's a beautiful GMC,
Dennis
jor wrote on Tue, 21 June 2016 20:44Thanks, guys. Just the info I was looking for. I usually drive a vehicle up on boards to change the oil but I like it hanging when I do a grease job. As you all recommend, I ALWAYS use jack stands and I'm going to lift from the middle. Another question: Is there a drawing showing all the grease points? I got a pile of documentation with the GMC but I'm having trouble finding some information. I joined GMCMI and am getting the USB drive with all the manuals on it so that should help.
jor
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: Jacking and Jack Stands [message #302516 is a reply to message #302501] |
Tue, 21 June 2016 21:40 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Haa Rob. It is a bit claustrophobic. And my front ride height is not sagged! I added the chin deflector below the core support so can't fit center any more but it really helps cooling. Trade offs!
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Jacking and Jack Stands [message #302517 is a reply to message #302510] |
Tue, 21 June 2016 22:43 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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When reversing down the plastic ramps do not do it under power, let the
coach coast down the ramps. I have shot my plastic ramps over 20 feet when
backing off the ramps.
It just downed on me that I was power braking when I backed off the ramp.
Foot on the brake and tried to ease down the ramp and than with a little
acceleration it would shoot the ramps forward.
On Tue, Jun 21, 2016 at 7:20 PM, Thomas Phipps wrote:
> You can always use a set of the plastic ramps to provide extra clearance
> under the front of the coach. Then slide under. If you remove a wheel,
> slide
> it under the frame to act as a final stop, if your jack stands fail.
> Tom MS II
> --
> 1975 GMC Avion
> KA4CSG
>
> _______________________________________________
> 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: Jacking and Jack Stands [message #302522 is a reply to message #302501] |
Wed, 22 June 2016 01:23 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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If you are going to jack up the front in the middle, which I suggest that you do, please make sure that you are jacking on the correct cross member. The cross member that you want has two vertical holes in the center about 4" apart. You want to jack at the point where those two holes are.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Jacking and Jack Stands [message #302537 is a reply to message #302501] |
Wed, 22 June 2016 10:41 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Being something of a scaredycat, I don't trust adjustable jack stands. I crib mine with 4x4s about two feet long under the frame doublers in back and the crossmember in front.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Jacking and Jack Stands [message #302542 is a reply to message #302518] |
Wed, 22 June 2016 15:28 |
jor
Messages: 43
Registered: June 2016
Location: Tucson
Karma: 0
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Quote:If you don't have a hardcopy, download parts A and B from
That's the ticket. Thanks. What I'm seeing in the manual I have isn't what I'm looking at. This one looks right. I'm starting to get organized. What I'm learning is there are lots of sources for lots of information and at first, it's a bit overwhelming. Getting there though. Thanks.
jor
John O'Reilly
76 Eleganza II (quad bags, disc brakes w/ reaction arm. 3.70 gears, manny trans, headers, Patterson dist.)
Tucson, AZ
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