Option Code ZW7

Bigkevschopshop · Nov 13, 2019

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 · Nov 13, 2019

@swathdiver @Countryboy07

swathdiver · Nov 13, 2019

Bigkevschopshop said:
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 · Nov 13, 2019

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 · Nov 15, 2019

swathdiver said:
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 · Nov 15, 2019

James Ward said:
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 · Nov 16, 2019

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 · Nov 23, 2019

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 · Nov 23, 2019

trailblazer said:
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 · Nov 23, 2019

HiHoeSilver said:
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.

Option Code ZW7

Bigkevschopshop

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HiHoeSilver

Away!

swathdiver

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Bigkevschopshop

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James Ward

2015 Tahoe LT

swathdiver

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akbrener

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trailblazer

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HiHoeSilver

Away!

trailblazer

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