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Old 09-24-2014, 06:52 PM   #1
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Pin box

Has anyone ever converted a staight down pin box to a newer style extended ?
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Old 09-24-2014, 09:24 PM   #2
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Heard of going the other way though. What you are speculating may put added stress on frame. I would contact manufacturer about this.
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Old 09-24-2014, 09:25 PM   #3
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Check with the repair shops. I don't see a problem as long as it has the same rating and you can get the right bolt pattern. JMO
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Old 09-24-2014, 09:33 PM   #4
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If you extend the pin forward it increases the lever effect on the frame. I have no idea if it will be good or not. Manufacturer will.
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Old 09-25-2014, 04:53 AM   #5
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Thanks for the replys, I should give more info, I tow with an heavy MDT, really close to a class 8, and I am building a 32 ft 5th wheel from a 73 skamper so info from the manufacturer is slim. I was thinking of some form of motion absorbing pin box and don't know if they make one in the straight down configuration.
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Old 09-25-2014, 08:38 AM   #6
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Why not buy an air ride hitch?
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Old 09-25-2014, 11:41 AM   #7
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I have thought about that also, I like to kinda explore all options, before I jump into anything.
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Old 09-25-2014, 08:00 PM   #8
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Quote:
Originally Posted by Harley1994 View Post
I have thought about that also, I like to kinda explore all options, before I jump into anything.
Putting an extended pin box on a 1973 frame that was designed for a straight drop pin box is probably a big risk. Back then tow vehicles had 8 ft beds.

While you are exploring the option of an air ride hitch, you probably should also consider the height of each hitch and it's height adjustability. With your MDT, you may have a problem keeping the hitch plate low enough for level towing. The target is around 48 inches. Or maybe you are already planning on lifting the fiver height.
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Old 09-25-2014, 10:14 PM   #9
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Air ride hitch are 11-12" high. Most offer 4" spacer if needed.
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Old 09-25-2014, 10:23 PM   #10
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Terry - do you know any mechanical or structural engineers. Even a civil engineer may be able to help you.
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Old 09-26-2014, 06:18 AM   #11
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dayle1, right now I use a full size 5th wheel, and I want to switch to something more forgiving. My trailer is going to be high, it originally had the axles above the springs, plus they were drop axles, I'm going with straight axles and putting them under the springs. Height is not going to be an issue. glennwest, do you have an air ride hitch? and is that height at the top of the plate? Gordon, I can't think of any engineers that I can talk to right now, I think I'll leave the pin box as is.
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Old 09-26-2014, 08:21 AM   #12
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Yes, that is ride height. Trailersaver is 11" and myairhitch is 12". I will be ordering the myairhitch soon.
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Old 09-26-2014, 10:46 AM   #13
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Thanks for the measurments, I'll have to measure what I have now, I can't remember what they are, it sounds like its close.
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Old 09-27-2014, 12:24 PM   #14
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If you are going to extend the hitch forward it will add some torque to the existing pin location. Likely a welded plate from the old pin location back along the frame should be sufficient. How big and how far - I have no idea.
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