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Old 08-07-2008, 06:30 PM   #29
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Thumbs up Reese

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Originally Posted by hookedonclassic View Post
bob: What brand is the class v pictured in your post that you used as a replacement. Thanks.



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“After all these years the reason I continue to love Thanksgiving.....I still sit at the kids table.”
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Old 08-07-2008, 06:58 PM   #30
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I'll have to keep an eye on my 08 Yukon. You all have me pretty concerned. I only have 3000 miles on it now, half of it towing.
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Old 08-07-2008, 07:09 PM   #31
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Originally Posted by thatismytruc View Post
I'll have to keep an eye on my 08 Yukon. You all have me pretty concerned. I only have 3000 miles on it now, half of it towing.

Been kind of off this subject for awhile. I will do some checking at the Store soon.

Do you have a photo of the unit?
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“After all these years the reason I continue to love Thanksgiving.....I still sit at the kids table.”
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Sandra wanted to go to Cleveland on vacation,
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Old 08-07-2008, 07:27 PM   #32
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I saw your photos. I was going to have a look tomorrow, It's raining quite hard right now. I assume if it's round bar I may have issues. I will snap a photo if it's something that does not resemble your photos. Thanks.
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Old 08-07-2008, 07:36 PM   #33
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I have an '07 GMC 1/2 ton truck with the factory hitch, and we just got back from an 11,000 mile trip, almost all towing, to Alaska and back. Believe me when I say some of the roads up there are not good. I inspected the hitch several times during the trip, and when we got back, and found no problems.

One of the things that many don't understand about the GM "round" hitch is that it bolts to another cross member that is part of the bumper. Are two round members equal to, less than, or greater than one larger square member?
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Old 08-07-2008, 10:13 PM   #34
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Originally Posted by SteveH View Post

One of the things that many don't understand about the GM "round" hitch is that it bolts to another cross member that is part of the bumper. Are two round members equal to, less than, or greater than one larger square member?
I think this the one you are talking about, it is the one that was installed on our 06 3/4 Burb. Although it did bolt to the underside of the bumper the reciever box itself is where the weld failures are taking place.

Also note how short the frame mount legs are compared to the replacement, much more efficient at transfering the weight to the frame and eventually to the front suspension. Four bolts per side as opposed to 6 on the OEM.
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“After all these years the reason I continue to love Thanksgiving.....I still sit at the kids table.”
RLC

Sandra wanted to go to Cleveland on vacation,
but I’m the Husband, so we went to Cleveland.
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Old 08-08-2008, 06:03 AM   #35
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Have there been any reported failures?

With screws backing off etc. that sounds like a poor installation to me. Surface rust is common.. while welds cracking should not be. Inspection of our running gear is crucial.

No recalls?

yakman
Hi yakman; I have taken my 06 HD to the dealer. At time of inspection it became obvious that no Locktite or lock washers were installed on the two bolts attaching it to the bumper. The paint has blistered at the welds, and there are indicators of welds beginning to crack, despite the opinion of the dealers service person who is not a metallurgist nor a welder. The issue is in design of the hitch. The four side rail bolts which attach the hitch to the frame are close to each other, and much too far forward of the bumper. The Reese tow bar places the hitch ball about two feet back of the rearmost frame mounting bolt. This places the ball at serious leverage advantage once the bumper bolts back out. The noises I have heard must have come from the back of the hitch hitting the bumper when going over bumps.

Yesterday I received a new ULTRA FRAME 15.000 Lbs hitch #41937 made of 3" square tubing 1/4" wall. Frame mounting bolts are spread at 14" centers. No bumper attaching holes in the bracket. They will have to be drilled out in the existing welded to the hitch bracket. Frame mounting rails are massive. They are 1/4" thick and 21" long. I believe it is made by Draw Tite, although it does not display any other names than ULTRA FRAME. The receiver box is a hefty 1/4" wall box reinforced by a 3/8" X 1" thick collar. It has 1/2" & 5/8" pin location. I will be installing it coming Saturday after which I will post a detailed report.

I would like to add one scary detail to the OEM hitch. The breakaway system's tether was attached to the hitch. If that hitch separated from the TV, the brakes would not have been activated. Has someone lost a life because of it, I could never camp again with this kind of memory on my mind. This may not be first thing on our mind, but it is a VERY SERIOUS ISSUE should it happen. Thanks, "Boatdoc"
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Old 08-08-2008, 06:48 AM   #36
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Quote:
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Are two round members equal to, less than, or greater than one larger square member?
The shape has no bearing on the strength as long as the proper calculations were performed by the GM Engineers, and proper materials were used. I just referred to the round bar as a description, a form of differentiation between the factory and after market hitch.
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Old 08-08-2008, 07:07 AM   #37
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Quote:
Originally Posted by ROBERT CROSS View Post
I think this the one you are talking about, it is the one that was installed on our 06 3/4 Burb. Although it did bolt to the underside of the bumper the reciever box itself is where the weld failures are taking place.

Also note how short the frame mount legs are compared to the replacement, much more efficient at transfering the weight to the frame and eventually to the front suspension. Four bolts per side as opposed to 6 on the OEM.
Robert,

I'm not trying to dispute what you are saying, however you are not including the strength and mounting bolts of the bumper crossmember in the equasion of the stock hitch mount.

On my truck, an '07 GMC 1/2 ton, there is an actual crossmember inside the bumper of significant strength...not just the bumper.
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Old 08-08-2008, 09:09 AM   #38
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I am thinking GM may have corrected the problem at least for the 2500 hd. Now I look at hitches when walking threw parking lots hahah my kids say why do you keep looking down to me. Thats funny I think. Mouting bolts I would think should be no less then grade 8
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Old 08-08-2008, 03:09 PM   #39
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Thumbs up Change in design..

Quote:
Originally Posted by SteveH View Post
Robert,

I'm not trying to dispute what you are saying, however you are not including the strength and mounting bolts of the bumper crossmember in the equasion of the stock hitch mount.

On my truck, an '07 GMC 1/2 ton, there is an actual crossmember inside the bumper of significant strength...not just the bumper.
Steve,
Your absolutely right, it's not the strength of the bumper mount bolts that are in question, it's the fact that the welds are failing at the hitch box, poor design and inadequate material strength.

The change in design can be seen in the thru bumper design on the new Suburbans. You can see here that the hitch box is mounted completely thru the square crossmember, and is 360 welded both sides. This hitch also has the two support bolts on either side of the reciever. The hitch itself is bolted directly into the ends of the frame rails. The issue with these has been hitch height. Which can be as high as 23 inches on the Z71.
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“After all these years the reason I continue to love Thanksgiving.....I still sit at the kids table.”
RLC

Sandra wanted to go to Cleveland on vacation,
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Old 08-08-2008, 04:03 PM   #40
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Quote:
Originally Posted by ROBERT CROSS View Post
Steve,
Your absolutely right, it's not the strength of the bumper mount bolts that are in question, it's the fact that the welds are failing at the hitch box, poor design and inadequate material strength.

The change in design can be seen in the thru bumper design on the new Suburbans. You can see here that the hitch box is mounted completely thru the square crossmember, and is 360 welded both sides. This hitch also has the two support bolts on either side of the reciever. The hitch itself is bolted directly into the ends of the frame rails. The issue with these has been hitch height. Which can be as high as 23 inches on the Z71.
My 2007 2500HD Silverado has the tubular hitch set up. I do have the usual surface rust but no cracks yet. I'll certainly keep and eye on it. I think it would be fine for the usual hook and tow, but with all the stress of the WD hitch from raising and lowering the trailer etc. I think it has the potential to fail at those welds.. but then again I'm no doctor, I mean welder.

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Old 08-08-2008, 04:50 PM   #41
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Thanks fr the photos Robert. That's what my Yukon set up looks like, you saved me taking some photos in the rain. I'm feeling very comfortable with that set up. Very strong. My ball ended up being at 20". A smidge high but better than the 23" you mention.
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Old 08-08-2008, 09:10 PM   #42
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Quote:
Originally Posted by ROBERT CROSS View Post
Steve,
Your absolutely right, it's not the strength of the bumper mount bolts that are in question, it's the fact that the welds are failing at the hitch box, poor design and inadequate material strength.

The change in design can be seen in the thru bumper design on the new Suburbans. You can see here that the hitch box is mounted completely thru the square crossmember, and is 360 welded both sides. This hitch also has the two support bolts on either side of the reciever. The hitch itself is bolted directly into the ends of the frame rails. The issue with these has been hitch height. Which can be as high as 23 inches on the Z71.
Robert,

OK, I heard quite a while back the GM hitches were haveing trouble at the welds. I went out and looked at the welds on mine at that time, saw they did not look adequate, so I got out my welder and set about reinforceing the welds. The three welds that hold the receiver to the attachement piece that goes to the bumper crossmember are the ones that I rewelded. I've not had any trouble. The whole job took me less than an hour. However, I think I will retorque the bolts also.
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