Rear coil springs 2 different GM style

[Woodblocker55]

Ok brother has 2002 Chev suburban LT has towing he has the 1040 lb coils in rear . They seem pretty soft .. I have a 2006 GMC Yukon XL and mine has the 1300 lb coils mine is pretty stiff if you get some weight on it you can tell there's a big difference . How in the RPO can you really tell witch rear coils you have ? Both have smooth ride suspension ..but the 2002 is way softer in the rear.

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[swathdiver]

Ok brother has 2002 Chev suburban LT has towing he has the 1040 lb coils in rear . They seem pretty soft .. I have a 2006 GMC Yukon XL and mine has the 1300 lb coils mine is pretty stiff if you get some weight on it you can tell there's a big difference . How in the RPO can you really tell witch rear coils you have ? Both have smooth ride suspension ..but the 2002 is way softer in the rear.

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Joe, I'm fairly certain there were 4 suspension options for the GMT-800 Wagons. The first was Z71, Rancho shocks out back with HD springs all around. The next was ZW7 with ACDelco shocks and the same (usually) HD springs. There's another version of ZW7 paired with G65 and this setup runs Nivomat rear shocks with softer springs. Finally, there was Z55 Autoride with G69 Automatic Level Control, a compressor for the air shocks out back and softer springs too.

Check your and your buddies RPO codes looking for ZW7 with or without G65. Good on you for knowing your spring rates, been looking for years for my generation and have come up with zip.

 

[Woodblocker55]

Joe, I'm fairly certain there were 4 suspension options for the GMT-800 Wagons. The first was Z71, Rancho shocks out back with HD springs all around. The next was ZW7 with ACDelco shocks and the same (usually) HD springs. There's another version of ZW7 paired with G65 and this setup runs Nivomat rear shocks with softer springs. Finally, there was Z55 Autoride with G69 Automatic Level Control, a compressor for the air shocks out back and softer springs too.

Check your and your buddies RPO codes looking for ZW7 with or without G65. Good on you for knowing your spring rates, been looking for years for my generation and have come up with zip.

Yes my brothers 2002 Chev suburban LT has G65 the 2006 GMC Yukon XL does not .. both have the ZW7.. thanks for clearing this up we might need to put new set springs in the 2002 for towing . There is big difference when you hook up a trailer G65 seems pretty soft.

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[Fless]

The Nivomats, if theyr'e working right, take a block or two of driving under load to adjust, so be sure that you're not comparing them only when initially hooking up the trailer. Give them a short drive first.

 

[Woodblocker55]

The Nivomats, if theyr'e working right, take a block or two of driving under load to adjust, so be sure that you're not comparing them only when initially hooking up the trailer. Give them a short drive first.

Here is the shocks that were on there I put on coil over shocks for my brother 2002 Chev suburban LT last year .. they both were leaking oil .

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[Woodblocker55]

Now on my 2006 GMC Yukon XL slt ZW7 I bought set of KYB front shocks said they were for smooth ride zw7 but how do I know what shocks go in the rear ? I looked under rear and coils have sticker yet . YKK are they the 1300 lbs ones ? now I'm questioning everything ..

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[Woodblocker55]

I looked there was no RPO code that said anything about level control G65 it said base rr springs... So I'm only thinking that be the 1300 lb rear springs on the GMC Yukon XL slt. So I think 537-387 shocks will work with my ZW7 2006 GMC Yukon XL slt . Really it's Easyer to deal with my weight distribution hitch. With regular shocks .

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[swathdiver]

Now on my 2006 GMC Yukon XL slt ZW7 I bought set of KYB front shocks said they were for smooth ride zw7 but how do I know what shocks go in the rear ? I looked under rear and coils have sticker yet . YKK are they the 1300 lbs ones ? now I'm questioning everything ..

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Joe, my 2009 has YWK springs, sticker looks the same too. Look on the back side of next time you're down there and see if the part number is still on it or above the top most YKK. If you can gently clean the sticker then maybe your phone can read the bar code with one of those bar code scanner apps too.

 

[Woodblocker55]

Joe, my 2009 has YWK springs, sticker looks the same too. Look on the back side of next time you're down there and see if the part number is still on it or above the top most YKK. If you can gently clean the sticker then maybe your phone can read the bar code with one of those bar code scanner apps too.

Here is the number.


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[Woodblocker55]

Here is the number.


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Says they used YKK all way to 2011 .. first year was 2004 ... So are they the 1300 lb coils ? So I just use regular shocks in the rear ?

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