I picked up a 200g Yukon XL back in october. this is my first fullsize i have played with. it has the zw7 premium suspspension but seems like it does not have level but i may be reading sticker wrong. looking to change all 4 shocks as they look to be horrible shape. they are super scaley and dond have a single like of paint or any decals left. it is a north east truck. i wanted to run sachs. gm genuine or ac delcos for shocks prefer to match same brand/series at all 4 corners if possible. i do alot of long distance driving so trying to get truck up to *****.
2006 Yukon xl with zw7 suspension
- Thread starter 81MSW79
- Start date
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mattbta
Full Access Member
this will get a lot of noise, but premium smooth ride is ZW7 and G65. you could put the sachs/nivomats on but would need softer springs.
lots of folks run bilstein 4600/5100 and send it.
lots of folks run bilstein 4600/5100 and send it.
so what your saying is since i dont have the g65 designation on my sticker is to convert to the nivomats and try to locate the proper springs to go with it? with the bilstiens from what i seen almost all the rears are requiring a new spring . i am looking to try and keep this simple with a straight swap of shocks.
mattbta
Full Access Member
if you had nivomat/sachs originally they need a stiffer spring to convert to a standard shock. conversely, it appears you don't have those so to change to them, you'd need a softer spring.
swathdiver
Full Access Member
Front shocks are 540-201 or 88965472
Rear shocks are 540-433 or 25871225
GMPartsGiant.com
Don't see too many on here with 4.10 gears, seems like a nice truck.
Rear shocks are 540-433 or 25871225
GMPartsGiant.com
Don't see too many on here with 4.10 gears, seems like a nice truck.
it has been pretty nice so far. those front shocks seem to be discontinued everywhere i look.
The RPO codes don't show G65, so this Premium Smooth Ride didn't have the Nivomats from the factory.
swathdiver
Full Access Member
Stingray Chevrolet in Plant City, Florida says they have them.
i will try calling them on monday may get lucky and they will ship them
been away for awhile so update on what i did. i called the Plant City dealership who said they did not have them in stock. the parts guy gave me number of 2 dealership phone number numbers that are the only 2 in the GM system. one dealership in Missouri and 1 in California. each showed 2 shocks in stock. Called Missouri dealership. Guy at parts counter was super helpful. he said the 2 that showed in there system was incorrect. but he gave me a few parts to choose from to look into. He said for his personal truck which is a suburban( basically same as my yukon xl) he ran the ac delco gold/ heavy duty line shocks ACDelco Specialty 525-68 rear and the ACDelco Specialty 525-59 fronts . so those are what i ordered up to try out for now. thank you everyone who tried to help out especially swathdiver .
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JCODOHERTY
Member
ZW7 also calls for particular jounce bump stops in the rear. Usually overlooked these days. The Hummer H2s and Escalades still call them out correctly and have them listed. You'll notice that they're longer than the regular ones. Rock Auto got them to me easy enough and for the right price. Dealers want way too much for them. I have them with GM replacement Nivomats and GM replacement HD/Z71 type springs. Seems to work well enough. As close as original as I can get it for the back. Might be a tad bit high when unloaded but doesn't dance around and the slightly more than factory rake is what I prefer anyway.
I did not know this. Thanks for the information. I found a set on Amazon referencing the GM part #15270578
JCODOHERTY
Member
For my 04 Yukon XL SLT w/ ZW7 and Nivomats it calls for GM part 15115208, same as the Escalades and H2s. Look for made in US stock. World Parts Direct or Rock Auto will have them.
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ZW7 & Nivomats here also, but in an '04 Tahoe. I saw #15115208 on Rock Auto with identical diameters and a slightly different (more robust) profile from #15270578. That price difference is substantial.
Should I ever need to replace these, your recommendation looks like a firmer upgrade. Thanks again.
JCODOHERTY
Member
ZW7 & Nivomats here also, but in an '04 Tahoe. I saw #15115208 on Rock Auto with identical diameters and a slightly different (more robust) profile from #15270578. That price difference is substantial.
These are the larger rear jounce bumpers found on Escalades/Hummer H2s and Yukons w/ ZW7 smooooth ride. The one in the middle is what was installed by Palmdale CA GMC back around 75k / 90k service or something. The little guy on the right is supposed to be for the front end. Amazon shipped me the fronts. I think they’re both made in USA (original GM spec). Im going to give them a try.
JCODOHERTY
Member
The other ones (replacement existing from a service at some point) don't seem to do anything with new Nivomats and the only spring choice left from GM, the HD / Z71 type replacements. GM used to spec several different springs for the rear on these vehicles. I always thought it was more about selling different "ride" versions to buyers than anything else. The Sachs Nivomat design is good and was new for GM, but the right springs and jounce bumpers must be part of the set up. This is somewhat important when carrying weight in the load bed. The Nivomats do their own thing to level out by compressing oil in two champers, or something like that. Having the longer bump stops out back may improve things. Plus I'm going to a tire with a 116 load index, all 4 corners. Michelin Defender LTX 265/65 R18. I want to maintain the feel of the Nivomats. And was not convinced going to a slightly taller coil spring was the thing to do. I'll report back my findings.
