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Old 08-23-2006, 09:46 AM   #15
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Quote:
Originally Posted by uwe
You should get 12" drums with 6-bolt hub flange.
To get those axles, you will have to get them to order the higher rated #11 axle, downrated to your specifications.
I also believe that 45degree down is too steep. Your trailer will sit very high, and it will be hard to use the Bal Levelers, if you ahve them, in any terain but flat.
The entry step will be very high also.
I used 32.5 degree down, and it's quite a bit. Stock is 22.5 degree.
Ask your dealer to specify "Airstream" axles. Have them talk to engineering, not sales.... that is the secret to getting Airstream compatible axles from Dexter.
Uwe nailed it. I agree 100% with his post. Additionally, have you thought about disc brakes - they are leaps and bounds above the drum brakes.

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Henry
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Old 08-24-2006, 06:24 PM   #16
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Jim called this afternoon. Dexter had no problem with any issue except for mounting details on the shocks. I had asked Jim to also have Dexter provide shock mounts and to install new shocks.

Shocks on the torsion axles are a bit of an oddity in the trailer world. I told Jim I wanted to consider the matter a bit and would call back with a decision of go or no go on the shocks. After a few minutes of surfing the forums, I decided to press on with shocks.

I asked Jim to:

1. Have Dexter install shock mounts or----

2. Cut the shock mounts off my old axles and reweld at his shop.

3. Re-use my old shocks until I track some down.

Jim's quote for my axles less shock mounts was $434 per plus installation. This may not be as bad as I thought.
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Old 08-24-2006, 06:55 PM   #17
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About the 10 inch brakes

I talked at length with Jim about the standard 10 in brakes on the 3500# axles. He said the same 10 in brake is used up to 5200#.

Here is my speculation about the 10 in. versus 12 in. brake issue. It really doesn't matter what the physical size of the brake drum is independent of other factors in the engineered design. Some of the other factors are the linear force produced by the magnetic actuator (new oval opposed to old style round), width of the shoe, mass of the metal components and their ability to absorb, transfer and dissapate heat. If Dexter's team of engineering specify and recommend the 10 in brake as a part of their design, why should I dabble in second guessing their turn key product.

If I was pushing the edge and trying to tow my trailer with a 1/2 ton tow vehicle, I might go with the 12 in. But I am not. I tow with an F-250 Powerstroke that is good up to about 12,000#.

I am trusting the manufacturer and dealer. I am going with the standard 10 inch electric drum brake and saving my money to spend on my kids.
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Old 08-24-2006, 07:24 PM   #18
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About selecting 45 degree axle arm angles

I do understand the stock angle was 22.5 degrees down. I understand that many owners choose to replace their axles with 32.5 degree axles to get a little more clearance.

I want a very comfortable margin of safety concerning dragging the rear of my trailer. No one on the forums has had anything positive to say about selecting 45 degrees axles for my replacements.

I got out the Dexter application guide. Here is what the numbers say:


difference in inches between loaded 45 deg and 22.5 deg=1.94

difference in inches between unloaded 45 deg and 22.5 deg=2.30

So I am going to assume a very worst case in altering the center of gravity of an unloaded trailer of less than 2.3 inches. By some rough estimate, I could shift the vertical center of gravity of my trailer up by 2% with this arrangement over the stock axles. So if I am creating a roll-over condition for a given curve at 50 mph a could also reduce my speed by 2 % to mitigate the danger. So I cost myself 1 mph of curve handling capability. I can live with that.

The 1.94 to 2.3 inches is also in the neighborhood of the nominal dimension of 2x lumber. So I could carry a block of 2x6 the put under my leveling jacks to overcome the increased height. I can live with that.

I can live with both of the above issue. I will take those consequences over dragging the rear frame of my trailer and causing structural damage or upsetting my waste tanks on a high spot.
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Old 08-24-2006, 07:25 PM   #19
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Quote:
Originally Posted by trevisgardne
......Jim's quote for my axles less shock mounts was $434 per plus installation. This may not be as bad as I thought.
Great price. Sounds like you found a prince of a dealer, as well. Keep us posted.

BTW, you're not in the United States Air Force by any chance, are you?

JIm
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Old 08-24-2006, 07:29 PM   #20
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Quote:
Originally Posted by Jim & Susan
Great price. Sounds like you found a prince of a dealer, as well. Keep us posted.

BTW, you're not in the United States Air Force by any chance, are you?

JIm
Yes I am in the Air Force. Are you?
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Old 08-24-2006, 07:45 PM   #21
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Nah, I just think your avatar is cool. Looks real similar to the 8th Air Force patch from WWII.

One more thing, thank you for your service to our contry. Aim High.

Jim & Susan
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Old 08-24-2006, 08:32 PM   #22
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Woa, big fellow....

Hello from a native Maryvillian who now lives in GA and hunting a new home again in east TN.
Normally, I wouldn't say anything as you appear to be sure of your steps, although they do go against the recommendations of so many others.
Now, that I've made you mad, and I didn't mean to....

Did you know that you can order your axles in increments of 100 lbs?

Did you know that by ordering 3600lb axles, you can get the 12 inch brakes?
With the 6 lug hubs?

Do you really think that Airstream would have changed to 12 inch brakes if 10 inch ones were adequate?

Did you know the axle tubes on the #10 (what you are planning on) are 1/2 inch smaller than the #11's?

Did you know that by ordering the #11 axles, the mounting brackets and holes are almost a perfect match?

Did you know that Dexter will weld the mounting plates on reversed (just like your present ones) and that makes them SOOOOOOO much easier to mount?

Did you know that, if using a #11 axle, by trimming the square holes on your trailer by 1/8" front and back of the hole, that the Dexter axle will bolt right up through the back hole, and the front hole only needs to be elongated by 3/16" for a 'bolt on' application?

The entire application of Airstream hookup requires a very level trailer, and the manuals give very specific measurements to make them work well with the weight distributing hitches. By 'raising' the center of gravity on your trailer when raising the angle, you not only will have to come up with new measurements, but it also will change your spring rates (that is a whole 'nother discussion. Take time to educate yourself on rough riding suspensions, and what they do to cabinetry, rivets in your inside skin, etc. Andy can help you with that. I highly suggest you slow down slightly, and check out everything before you let them order/sell you these axles as you describe. The installation fees can be very high. Please be careful.
Oh, and by the way, I ordered two new 3700lb axles, that is the #11 size, 12" brakes, reversed brackets, and 22.5 degree arm locations and then installed them on a 1973 Airstream and they work so perfectly that it scared me. The price out the door at the Dexter CO in Jackson, GA was right at $900. I installed them, cutting my old mounts off the old axles, and welding them onto the new ones, and the entire project took two of us right at 8 hours.

I have a copy of my order form if you would like to see it. Also, Dexteraxle,com has multitudes of information on it.

Please, research, reconsider.....and ask the Dexter guy why he didn't tell you all the above. He should have.
Good luck.
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Old 08-24-2006, 10:06 PM   #23
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Seems everyone has missed the point that the spindles AND bearings are nearly twice the rating on 12" as opposed to 10".

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Old 08-25-2006, 01:19 AM   #24
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Hello ,

i posted clearly that the spindles and the bearings are larger on the first page of this thread.The 12" brakes are the ones to get ,10" brakes on a 5200#
axle ? you must ask then why do they build the original axles with a 12"
brake ?The bigger stronger spindles should be enough of a good reason to
get the larger axles.There is more to the brake size than speculation of metals and such .I replaced 10" front brakes on my old IH scout with 11"
drums ,a huge improvement ,any increase in the brake size is better,
12" drums is much more than the size difference for certain.The 10" will run
hotter under braking and are not designed for any large travel trailer.Dexters
reasoning must be cost related ,cheaper to use small brakes ,cost them less .
Wider shoes does not equate the same braking ,wider shoes means their trying to make the smaller brakes work better.I would not go down in size
from what the trailer originally came with .Why ,is the question?Andy has
mentioned many times about increasing the rating of the axles ,airstream
trailers are pretty specific to what works well.Just trying to give helpful
information in your axle decision .

Scott
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Old 08-29-2006, 03:59 PM   #25
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By changing the height of the trailer the tongue height will change. That can have an impact on how the trailer pulls.

>>>>>>>>>>>>Action
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Old 09-30-2006, 08:42 PM   #26
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I have my trailer with new axles

I picked up my trailer on Friday. I was very pleased. The grand total cost was $1307 including tax.

That included:

Two new custom order axles
Freight
addition of shock mounts at the factory
installation of 4 new shocks that I supplied
re-routing of the LP line around the new axles
new brake assemblies
installation of everything
new lugnuts, etc.

I even managed to get the shock mounts powder coated by having Dexter do a turn key job. I am very pleased.

American Trailer Accessories was very thorough and very proffessional. The even measured the before and after height and adjusted my hitch assembly to accomodate the new ride height of the trailer.

I did order 4 new shocks from Airstream. $154 drop shipped from my closest dealer. I ordered with a credit card on Tuesday afternoon and the we at the house via UPS on Friday Morning.

Trevis
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Old 10-02-2006, 09:37 AM   #27
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Great!

Quote:
Originally Posted by trevisgardne
I picked up my trailer on Friday. I was very pleased.

Trevis
Good for you man! Feels great doesn't it!

How about some pictures?

Best Regards,
Henry
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Old 10-02-2006, 10:18 AM   #28
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so what did you wind up getting? the #11 axle w/ 12" brakes, or what was specified earlier in the thread with the 10" brakes, etc??
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