Cab Isolators

Jake707

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Mar 30, 2020
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I have an 05 crew cab and saw a couple videos of people changing out the cab mounts to hydraulic type isolators, some just did the back two mounts and the OEM style for the other four. I did notice my body lines don’t line up with the bed anymore like most of the videos but more of I’m trying to smooth out the ride. The long bed 2500 is a bit harsh empty and it’s my daily driver. I was wondering if anyone has changed out their cab mounts and if so did you change them all to the hydraulic type? They look to be about $50 each and it looks like I have 6 mounts so that would get up there in price.

I also came across sulastic shackles and they seem good too but have read people having short life spans with them.
 

torqued2dmax

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Mar 26, 2017
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Brookville, PA
I have had mine for 10 years and they are still like new , the company owner said they average 12 years , but I do not put many miles on or tow often I am sure that would make a difference in life expectancy !
 

Jake707

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Mar 30, 2020
76
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I have had mine for 10 years and they are still like new , the company owner said they average 12 years , but I do not put many miles on or tow often I am sure that would make a difference in life expectancy !

You did new isolators or the shackles?
 

Jake707

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Mar 30, 2020
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I did the back with hydraulic and the rest ProThane. I am switching to doorman because the truck vibrates at idle and I can't stand it.

Do you think the vibrations are from the hydraulic or the OEM style ones you replaced?
 

Chevy1925

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Oct 21, 2009
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Do you think the vibrations are from the hydraulic or the OEM style ones you replaced?


It’s from the prothane poly style he installed, not the hydraulic rear ones.

You need to look at your rear springs. More times than not I’m seeing guys with worn out rear leaf packs and the overload is maybe a 1/2” from the main pack. Makes the truck ride rough. You should have 1.75-2” clearance at the very back edge of the overload and the leaf pack. New pack isn’t too expensive or have them re-arched
 
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Jake707

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Mar 30, 2020
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Do those hydraulics only go in the rear or is it just cost savings only putting them in the back two mounts?

I’m not knowing the difference in the lead spring pieces. Where am I looking above the axle or on the end?
 
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Chevy1925

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Suppose to be rear only.

Look at the leaf springs. Should be 5 total on a 2500hd. Each one gets progressively smaller in length. The last thick one on the bottom between axle and leafs is the overload. It’s basically flat while the others have an arch to them. Measure the gap at the end of the overload to the next leaf above it
 

Jake707

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Mar 30, 2020
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Went out and looked at it. I think I measured the right part. Seemed to make sense haha
 

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Jake707

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Mar 30, 2020
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Ok that’s good to know. Not as expensive as I thought then to change all the mounts then.

Ok I measured right then. It’s about 3/4 to 7/8” gap
 
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Chevy1925

don't know sh!t about IFS
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Went out and looked at it. I think I measured the right part. Seemed to make sense haha


Yup, those are worn out.

Sulastics will help marginally on worn out packs.

Good leaf packs and sulastics is a very smooth ride
 

Jake707

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Mar 30, 2020
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is the measurement supposed to be with the truck in the air or sitting on the ground? I would think it would compress and loose some of that gap on the ground right?
 

Chevy1925

don't know sh!t about IFS
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Oct 21, 2009
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is the measurement supposed to be with the truck in the air or sitting on the ground? I would think it would compress and loose some of that gap on the ground right?


The measurement is as it sits currently. In the air means nothing. All springs sag over time. Torsions do it, coil springs, and leafs. As the springs sag, spring rate increases as the pack lays more and more on the stiff overload. Not good for your ride. You also loose preload on the pack which does not help suspension rebound. Specially when the overload becomes more involved.
 

Jake707

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Mar 30, 2020
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Ok. I def think the majority of the harsh ness comes from the rear. It’s rigid and almost like a skip where you feel the one bump three or so times after. Hard to explain
Now I’m wondering what order I should do these as I can’t afford to do them all at once. What’s the biggest bang for the buck I guess.
 
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Chevy1925

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Rear springs are the base of your issues. Start there and progress forward. Sulastics next, then body mounts
 

Jake707

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Mar 30, 2020
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That’s what I was thinking too. I’ll look into new springs and see what they will run first.
 
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