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Old 11-16-2014, 08:56 PM   #29
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Location: Ontario, CA USA
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My 2001 Alpine also sits tail low even after I set ride height, I think it is just the nature of the beast.

Dave Fernandez
2001, 38ft FDDS, 350 ISC, Tow 2004 Yukon
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Old 11-25-2014, 08:02 PM   #30
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Final follow-up: adjustable linkages in and made front ride height adjustment easy. If you need more adjustment than the small amount the valve will allow, here is an easy and relatively inexpensive solution.

2003 Alpine 38'

Originally Posted by wolfe10 View Post
Perhaps this should go under a new thread RIDE HEIGHT, but with the questions asked here, thought I would update my findings.

Ride height rod length really depends on where the ride height valve is located (how high on the frame rail they mounted it. And, no reason it should/is the same side to side, as only the frame rail to axle dimension (the ride height dimension) is critical.

On our 2003 38' I took some measurements this morning:

Left front ride height: 11 1/2". Rod length (pin to pin): 8 1/4"
Right front ride height: 11". Rod length (pin to pin): 11 5/16"
Both are standard 1/4" bolts at both ends.

Could not lower either side to spec (10 5/16") by adjusting the ride height valve (the 5/16" nut that connects the ride height valve to the arm to which the rod attaches).
And, re-drilling the lower rod mound will only give you about another half inch-- not enough lower to bring either side into specs.

The good news: different length ride height rods are available and reasonably priced.

Here are a variety of fixed length rods:

And the same company has adjustable length rods in two sizes (9-15") and 15-26". Here is the shorter one: https://www.heightcontrolvalve.com/shopexd.asp?id=109

Remember, ride height is critical in front, as change in ride height changes CASTER on our "trailing arm" design suspensions which can cause the coach to pull to one side. In my case, with the left front side ride height quite a lot higher than the right side, left side caster is greater and the coach pulls mildly to the right. Caster should always be a little more on right than left front to compensate for the crown in the road.

And, in back, out of spec ride hight can accelerate U joint and transmission output shaft and/or vibration.

2003 38' Alpine

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Old 11-26-2014, 07:27 AM   #31
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Still curious as to why the OEM adjustment valve and rod will no longer allow the ride hieght to be brought into specs....."Assume" the coach was once in spec [at or after manufacture]--what has changed to not allow it now? I tend to resist after market solutions until I fully understand root cause[s] for the existing problem....are we missing something here?
Old Scout
2003 40' MDTS
Garden Ridge, Texas
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Old 11-26-2014, 12:48 PM   #32
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Since we are the second owner, I have no idea if the front ride height was over an inch high from the factory or became that way over time. The coach, including suspension shows no signs of damage, and only has 34,000 miles on it.

I doubt the original owner was under there measuring ride height.

And, my solution was the least invasive-- particularly compared with remounting the ride height valves by drilling new holes through the (very thick) beams.

Also, remember, as I posted earlier, the left and right rods were no where near the same length (and really no reason for them to be the same length as long as they had a wide range of rod lengths when they assembled the chassis). Bottom line is that the adjustment available at the ride height valve is very limited.

2003 Alpine 38'

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