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  1. #1
    Super Moderator 77rr2x4s's Avatar
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    Car trailer vibrations

    I have a Aluma open car trailer. I installed a factory accessory rock guard to my trailer. It towed fine all of last year without the guard. Now I that installed the guard and I get varying vibrations and all different speeds. It will do it then stop and start agian for no rhyme or reason. And ideas. I hate to have to remove a $500 rock guard.

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    Aspen and Volare Super Moderator aspen79's Avatar
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    Maybe something to with air flow around it causing a harmonic vibration or it changed the wind load on the trailer frame causing a harmonic vibration? I'm only guessing and throwing out a theory, it's been a long time since NVH training. When you say it comes and goes, that's what makes me think of harmonics.
    1979 Aspen Sunrise 500". Bought in 1987 with 72,000 miles and a mighty E24 California emission 90hp leaning tower of power/4-speed
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    Super Moderator 77rr2x4s's Avatar
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    I agree. That is what I thinking also. I sent a email to the manufacturer to see what they have to say.

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    Aspen and Volare Super Moderator aspen79's Avatar
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    I remember way back when, during the truck bug shield, roof visor and "racerback" era of the '80's and
    90's, and trying to explain to customers why one, or worse, a combination two or all three caused all sorts of noise and vibration concerns, due to the air flow being disrupted. As I said though, just a theory on what's causing your vibration.
    1979 Aspen Sunrise 500". Bought in 1987 with 72,000 miles and a mighty E24 California emission 90hp leaning tower of power/4-speed
    1996 Dakota with a torque monster (not) 3.9L V-6 and automatic owned since 1998. Now demoted to winter duty
    2008 Ford Mustang V6, the new summer daily driver

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    Aspen and Volare Super Member Mopars1's Avatar
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    I don't know how it is mounted to the trailer but it may help to put some stress on it with some strong bungee cords or something similar to see if it stiffens the guard up to see if the vibrations go away.
    1977 Dodge Aspen R/T Super Pak T-Tops
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