Option Code ZW7

[Bigkevschopshop]

I know that on the 00-06 it was Nivomat rear shocks and softer springs that made the ZW7 package... On the 07-14 what makes the smooth ride package? I know it doesnt have nivomats in the rear anymore and thank god cause those things were not cheap if replacement was needed. Ive searched here with only a few results, some folks saying it was just softer springs, and why do so many shock options say without the ZW7 ? So figured I would help myself with others out if anyone has a definitive answer for these trucks ZW7 code.

 

[HiHoeSilver]

@swathdiver @Countryboy07

 

[swathdiver]

I know that on the 00-06 it was Nivomat rear shocks and softer springs that made the ZW7 package... On the 07-14 what makes the smooth ride package? I know it doesnt have nivomats in the rear anymore and thank god cause those things were not cheap if replacement was needed. Ive searched here with only a few results, some folks saying it was just softer springs, and why do so many shock options say without the ZW7 ? So figured I would help myself with others out if anyone has a definitive answer for these trucks ZW7 code.

ZW7 comes in two flavors. First, it is paired with G65, self-leveling shocks. When one has these two codes they have softer rear coil springs and Nivomat shocks, even on the GMT900s.

If one has only ZW7, they have the HD rear springs, as used on Z71s, and regular shocks and no auto or self leveling features.

Are you wanting to convert your Suburban to plain old ZW7 from Z55/G69?

If so, and you have a 4x4, rear springs are 25783733/45H2164 and rear shocks are 25871227/540-435. Coil spring insulators are 15251980 and 15765071. Note, these are the numbers for my 2009 GMC Yukon XL 4x4 with plain old ZW7.

 

[Bigkevschopshop]

Awesome reply.... Thanks For clearing it up.

I have a plain ZW7 2wd... SO i am guessing I have the HD springs in the rear with regular shocks... Thats good to know for sure... Thanks for the clearification on the ZW7 cause I have heard of the autoride one, and Had heard of Plain zw7 with regular shocks, and glad to know its really a thing.

 

[James Ward]

ZW7 comes in two flavors. First, it is paired with G65, self-leveling shocks. When one has these two codes they have softer rear coil springs and Nivomat shocks, even on the GMT900s.

If one has only ZW7, they have the HD rear springs, as used on Z71s, and regular shocks and no auto or self leveling features.

Are you wanting to convert your Suburban to plain old ZW7 from Z55/G69?

If so, and you have a 4x4, rear springs are 25783733/45H2164 and rear shocks are 25871227/540-435. Coil spring insulators are 15251980 and 15765071. Note, these are the numbers for my 2009 GMC Yukon XL 4x4 with plain old ZW7.

Well as some of you know, I have a 2015 Tahoe LT 4 WD and I have a ZW7 option. Now I have searched for the corresponding front and rear shocks, and frankly I'm now as confused as well. Each vendor I ask, comes with a new, different designation. ZW7 is gone and nobody at GM parts direct now's has any idea of what replaces it.

 

[swathdiver]

Well as some of you know, I have a 2015 Tahoe LT 4 WD and I have a ZW7 option. Now I have searched for the corresponding front and rear shocks, and frankly I'm now as confused as well. Each vendor I ask, comes with a new, different designation. ZW7 is gone and nobody at GM parts direct now's has any idea of what replaces it.View attachment 234297

Post a picture of your RPO sheet when you get a chance.

 

[akbrener]

my 2wd 08 has ZW7, blue shocks. not anything fancy. But I did change the springs out to the Moog "HD springs" and AC Delco HD shocks to get the back end up when towing.. there was a difference. Pretty sure my stock springs had 555 in the last part of the part number. they are long gone, but definitely not a heavy spring

 

[trailblazer]

I have spent a couple hours trying to figure this out and @swathdiver hits the nail on the head that with the NNBS Tahoe's we need the ZW7 and the G65 to get the magic Nivomat's. I am sick and tired of screwing around with leaky air shocks/bags. Does ANYONE here have a 07-13 Tahoe/Yukon with ZW7 and G65 Nivomat's? If so, can you PLEASE let us know what the OEM part number is on your rear shock assembly? This is so painful.

 

[HiHoeSilver]

I have spent a couple hours trying to figure this out and @swathdiver hits the nail on the head that with the NNBS Tahoe's we need the ZW7 and the G65 to get the magic Nivomat's. I am sick and tired of screwing around with leaky air shocks/bags. Does ANYONE here have a 07-13 Tahoe/Yukon with ZW7 and G65 Nivomat's? If so, can you PLEASE let us know what the OEM part number is on your rear shock assembly? This is so painful.

If you have air shocks, then you have Z55/G69. Why do you want ninvomats?

 

[trailblazer]

If you have air shocks, then you have Z55/G69. Why do you want ninvomats?

I have Monroe aftermarket Max-Air MA830 air shocks. I'm convinced that the rubber has leaks as I've sealed up the air lines quite well. I want Nivomats because they auto-level without any sort of electrical interface or pumps. They just seem to "work". Unfortunately, it is ridiculously difficult to get a clear answer from GM or anyone else for that matter. The definitive proof would be to find someone with a 2007-2013 Tahoe or Yukon that has Nivomats. Just slapping on Nivomats from the previous generation could be troublesome as they may not have the correct default ride height set for the 2007-2013 generation.

 

[trailblazer]

I just found this post at a different forum. Appears that one of the member indeed crawled under their truck and found "22811847". I'll have to check that out as RockAuto wants $49/ea. Too good to be true?

Edit: After looking at the part closer, I still question if this is a Nivomat self-leveling part. RockAuto shows 22811847 as being 15.78" when compressed. The older-generation Suburban with Nivomat matches to KYB SR Series Self Leveling Shock #SR2004 $241.79/ea which has a compressed length of 15.77". When I look at RockAuto's selection for my OE rear shock (I have a 2009 Tahoe LT 4WD), it points me to ACDELCO 540433 $51.79/ea which has a compressed length of 15.66"

 

[HiHoeSilver]

I have Monroe aftermarket Max-Air MA830 air shocks. I'm convinced that the rubber has leaks as I've sealed up the air lines quite well. I want Nivomats because they auto-level without any sort of electrical interface or pumps. They just seem to "work". Unfortunately, it is ridiculously difficult to get a clear answer from GM or anyone else for that matter. The definitive proof would be to find someone with a 2007-2013 Tahoe or Yukon that has Nivomats. Just slapping on Nivomats from the previous generation could be troublesome as they may not have the correct default ride height set for the 2007-2013 generation.

I see. You will need the right springs, as well.

I just found this post at a different forum. Appears that one of the member indeed crawled under their truck and found "22811847". I'll have to check that out as RockAuto wants $49/ea. Too good to be true?

Way too good I would think.

 

[HiHoeSilver]

I just found this post at a different forum. Appears that one of the member indeed crawled under their truck and found "22811847". I'll have to check that out as RockAuto wants $49/ea. Too good to be true?

One of James's tricks is to find a truck online with the options you want and use the VIN to get the part numbers. If you can find a VIN, @915_Tahoe can give you the numbers.

 

[trailblazer]

Its gotta be too good to be true. Also I learned more about the KYB true Self-Leveling shocks. The SR2004 are for the 2000-2006 Suburbans and the SR2003 are for the same vintage Tahoe's. They have the same travel distances but must have different internal pressure settings due to the obvious different in weight between the Suburban and Tahoe. The crappy part is that thte SR2003 is $300/ea from RockAuto

I might be better off paying the $120 or so to install an Air Lift onboard air compressor system rather than spending $600 for unicorn shocks.

 

[akbrener]

Its gotta be too good to be true. Also I learned more about the KYB true Self-Leveling shocks. The SR2004 are for the 2000-2006 Suburbans and the SR2003 are for the same vintage Tahoe's. They have the same travel distances but must have different internal pressure settings due to the obvious different in weight between the Suburban and Tahoe. The crappy part is that thte SR2003 is $300/ea from RockAuto

I might be better off paying the $120 or so to install an Air Lift onboard air compressor system rather than spending $600 for unicorn shocks.

What are you hoping to accomplish? do you NEED to have the quick response auto-level? Get a pair of MOOG 81069 springs and a pair of good standard shocks. add the bags inside the springs that can be pumped up with a standard air compressor when you tow

 

[BG1988]

ZW7 comes in two flavors. First, it is paired with G65, self-leveling shocks. When one has these two codes they have softer rear coil springs and Nivomat shocks, even on the GMT900s.

If one has only ZW7, they have the HD rear springs, as used on Z71s, and regular shocks and no auto or self leveling features.

Are you wanting to convert your Suburban to plain old ZW7 from Z55/G69?

If so, and you have a 4x4, rear springs are 25783733/45H2164 and rear shocks are 25871227/540-435. Coil spring insulators are 15251980 and 15765071. Note, these are the numbers for my 2009 GMC Yukon XL 4x4 with plain old ZW7.

Nivomat are pretty good I can leave a can of soda on the bumper and it will still be there..

I admit I left a bottle on my tailgate step

might have to replace the front ones as going over speed bumps causes it to hit the bump stops... but i will do that at 110k or so


I test drove a XFE they have the ZW7 as well it was a pretty smooth ride...