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Originally Posted by metalhead
On another note, does anyone know what bolt pattern a 1970 would use?
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6 bolts on a 5 1/2 inch circle.
That is how that trailer was built.
Keep in mind that someone could have changed axles, used 10 inch brakes and put on 5 lugs on a 4 1/2 bolt circle.
It happens, when an owner changes the original design, for whatever reason they may have had.
Best you call the seller and ask how many bolts one wheel has.
Also, keep in mind, that the axles may be shot. Best you check them out too. A quick check is to see how much of the tire, "above the wheel" can you see. It should be about 2 inches. If you cannot see the top of the wheels, the axles are finished. Stand along the side of the trailer, about 20 to 25 feet away and stoop down so that your eyes are about level with the top of the tires.
1974 and older Airstream trailers, will have axle failures, it's just a matter of when. The composition of the rubber rods, back then, in time, simply gave out, allowing the trailer to become lower than it should. This results in bottoming out when you hit even small bumps. That, in turn causes many different types of damage to the trailer.
Another clue, would be if the trailer was parked for as long time, without removing any weight from the axles. That's a sure death for the rubber rods, regardless of the year, and regardless who made the torsion axle.
Rubber must be exercised. If not, in time, it will take a set. When that happens, the axles are finished.
Andy