Aftermarket HD Rear Coil Springs - My Experience

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Heavy

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Hello. Figured I would post something that worked for my needs and didn't cost too much. Vehicle: 2013 Tahoe LS, no sunroof, RWD (2wd for you rebel mfers)

I have roughly 600+ pounds just in the cargo and another 300 or so in the 2nd row area. With factory OEM coils the vehicle still maintained roughly a 2" rake in the rear. The shocks/struts were replaced with Bilstein 4600's and running Nokian 11-ply at @55. It drove pretty good, straight and without much of a sway however when it came to significant bumps and such, the back end would turn to jelly. I was thinking of going the helper bag route with an onboard however I didn't want to spend too much $ and I wasn't completely sold on using helper bags. I researched a bit and found these -

Dayton Parts - CargoMaxx 351-897HD - HD: Designed to carry 35% more load at stock load height +1 <--- assumed the +1 is the added inch to the coil

I also looked at Moog but from what I saw it was either OEM (medium duty) or a HD option that had more lift than I was looking for. Nothing in between. I got the Maxxi HD coils through an online retailer and was able to select enough choices to have a fitament for a 07-14 Tahoe LS/LT RWD. Since then, the site has changed a bit. I know the 351-897HD will fit a wide range of trims and years but this was the closest fit to my ride. As stupid as this sounds, I like they were gray in color so I pulled the trigger. lol.

From what I could tell, the HD coils are slightly taller and thicker than OEM but not by much. My eyes aren't what they used to be but the HD ones do feel heavier. According to some sources, depending on your vehicle's trim and I'm sure other factors involved, these springs will raise the rear by roughly 0.9-1". Assuming the raise is due to an unloaded rear and the "+1". Other sources have stated 0.5-1" or 0-1"...."depending on trim and weight". I know there is a XHD version of these springs that will provide a lift of roughly 1.5-2" but I didn't want the rear to sit much higher than it was as I was enjoying the look of the squat. So after installing the HD coils (remember, these are not the XHD) I took measurements and to me it looks like it raised the rear end by roughly 1/2 to 5/8, which isn't too noticeable but it sure stiffened up the rear and took care of a couple squeaks. The ride is 10x better and the rear doesn't feel like it's ever gonna bottom out with all that weight. Luckily the OEM bump stops showed zero wear. I do notice the sway is a bit softer, if that is even a thing, but I'm taking into consideration going from a constant to a variable coil the ride will change. Yeah, it raised the rear end a little but it doesn't look too bad. I guess I'm good to go for the next upgrade if weight is added. I had visions of running 26's with a slight drop but I live in Portland and the Oregon administration (clowns) give zero ***** about the roads here.

Party on Wayne!

1000007339.jpg



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Foggy

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Looks Good ! I'm actually taking off my 22" wheels that came on my 2013
denali and putting on the 20" wheels that were stock on my 2014 denali
Big difference with less sidewall on the 22's.. I'd think if you carry quite
a bit of weight (enough to need better springs) you would really hate
24" wheels for sure.. Very little sidewall . My son put on 24" wheels on his
2016 denali and it rode horrible. He went back to the stock 22"s
 

Joseph Garcia

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Hello. Figured I would post something that worked for my needs and didn't cost too much. Vehicle: 2013 Tahoe LS, no sunroof, RWD (2wd for you rebel mfers)

I have roughly 600+ pounds just in the cargo and another 300 or so in the 2nd row area. With factory OEM coils the vehicle still maintained roughly a 2" rake in the rear. The shocks/struts were replaced with Bilstein 4600's and running Nokian 11-ply at @55. It drove pretty good, straight and without much of a sway however when it came to significant bumps and such, the back end would turn to jelly. I was thinking of going the helper bag route with an onboard however I didn't want to spend too much $ and I wasn't completely sold on using helper bags. I researched a bit and found these -

Dayton Parts - CargoMaxx 351-897HD - HD: Designed to carry 35% more load at stock load height +1 <--- assumed the +1 is the added inch to the coil

I also looked at Moog but from what I saw it was either OEM (medium duty) or a HD option that had more lift than I was looking for. Nothing in between. I got the Maxxi HD coils through an online retailer and was able to select enough choices to have a fitament for a 07-14 Tahoe LS/LT RWD. Since then, the site has changed a bit. I know the 351-897HD will fit a wide range of trims and years but this was the closest fit to my ride. As stupid as this sounds, I like they were gray in color so I pulled the trigger. lol.

From what I could tell, the HD coils are slightly taller and thicker than OEM but not by much. My eyes aren't what they used to be but the HD ones do feel heavier. According to some sources, depending on your vehicle's trim and I'm sure other factors involved, these springs will raise the rear by roughly 0.9-1". Assuming the raise is due to an unloaded rear and the "+1". Other sources have stated 0.5-1" or 0-1"...."depending on trim and weight". I know there is a XHD version of these springs that will provide a lift of roughly 1.5-2" but I didn't want the rear to sit much higher than it was as I was enjoying the look of the squat. So after installing the HD coils (remember, these are not the XHD) I took measurements and to me it looks like it raised the rear end by roughly 1/2 to 5/8, which isn't too noticeable but it sure stiffened up the rear and took care of a couple squeaks. The ride is 10x better and the rear doesn't feel like it's ever gonna bottom out with all that weight. Luckily the OEM bump stops showed zero wear. I do notice the sway is a bit softer, if that is even a thing, but I'm taking into consideration going from a constant to a variable coil the ride will change. Yeah, it raised the rear end a little but it doesn't look too bad. I guess I'm good to go for the next upgrade if weight is added. I had visions of running 26's with a slight drop but I live in Portland and the Oregon administration (clowns) give zero ***** about the roads here.

Party on Wayne!

View attachment 486792


View attachment 486793
If you start to feel any signs in instability in the rear when going through curves, you might want to consider a set of Hellwig sway bars. I believe that they would nicely complement the HD springs and the weight load that you carry.
 
OP
OP
Heavy

Heavy

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If you start to feel any signs in instability in the rear when going through curves, you might want to consider a set of Hellwig sway bars. I believe that they would nicely complement the HD springs and the weight load that you carry.
I was thinking of doing those sway bars too however I'm sure I will find out during my road trip here soon. Tks for the suggestion.
 
OP
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Heavy

Heavy

TYF Newbie
Joined
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Portland, Oregon
Looks Good ! I'm actually taking off my 22" wheels that came on my 2013
denali and putting on the 20" wheels that were stock on my 2014 denali
Big difference with less sidewall on the 22's.. I'd think if you carry quite
a bit of weight (enough to need better springs) you would really hate
24" wheels for sure.. Very little sidewall . My son put on 24" wheels on his
2016 denali and it rode horrible. He went back to the stock 22"s
Thanks. I don't blame you guys for going back to a more comfortable ride. Don't get me wrong, I love a nice chunky look but comfort is sure nice.
 

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