RPO Code Z85, What does it get you?

[SteveDillon]

Hello,

Have a new to us 2019 that came out of fleet use (U-Haul).  It has several towing goodies but not one of the standard trailering packages.  I'm trying to track down what Z85 means in a WorkTruck, 5.3 AFM, Reg Cab, 8' bed.  In prior years I have found it noted as increased towing capacity, or different shocks.  I've been through the 2019 order guide and I can't figure out what exactly z85 means for a 2019.

I'm asking because the truck suspension is very under-dampened, I've started to call the truck Bounce House.  I have counted as much as 5 oscillations after a speed bump.  Trying to find out if 'z85' changes my hunt for a shock with more or adjustable dampening.

[kodiakdenali]

Z85 is listed simply as "Chassis package - increased capacity" in the upfitter manual. that's for a 2020, but I doubt its any different in 2019. I can't help with exactly what that means in terms of equipment though.

[DemonWorks]

give me your vin and I can look up every rpo code (and post them) and maybe we can track down what specific "package" that came with.

 

Aside from that, I would point you to some bilsteins as replacement shocks.

[SteveDillon]

The VIN is 3GCNWAEF8KG296715 ,  It has a u-haul labeled hitch , so not sure what towing package was included.
I had scanned the QR code in the door and my deciphering of the RPO codes are as below.

I might be overthinking, I'm just trying to figure out if Z85 changed the spring rate, or had uprated shocks that somehow I shouldn't be throwing out.  The Bilstein site says "B6 4600" for front and rear for a stock ride height. 5100s for lifted.

Truck won't be lifted, but will haul light farm equipment, and tow a car trailer for a street/track Miata.  My 2 Miatas have springs that are 2-4x factory rates and adjustable dampers to match.  I like a pretty firm ride.  I think I should be buying 5100s but not matching dampers to a spring rate seems odd to me.

Thanks for Any Advice,

Steve

 

 

2019	Model Year
CC10903	Model
07	Build Month
19	Build Year
01	Engineering Book?
WQ	Vehicle Order Number
QJ08	??
AKX
AY0	Airbags, Dual-stage frontal airbags for driver and front outboard passenger; Seat-mounted side-impact airbags for driver and front outboard passenger; Head-curtain airbags for front and rear outboard seating positions; Includes front outboard Passenger Sensing System for frontal outboard passenger airbag
A2S	Seat adjuster, driver 4-way manual
A52	Seats, front 40/20/40 split-bench
A7E	Seat adjuster, passenger 4-way manual
C5U	GVWR, 6800 lbs. (3084 kg)
C67	Air conditioning, single-zone
DLF	Mirrors, outside heated power-adjustable
D31
EF7
E63	Durabed, pickup bed
FE9	Emissions, Federal requirements
FJW
GAZ	Summit White
GU6	Rear axle, 3.42 ratio
H1T
IOR	udio system, Chevrolet Infotainment 3 system, 7" diagonal color touchscreen
I19	ENGINEERING YEAR 2019
J61	Brakes, 4-wheel antilock, 4-wheel disc
KW7	Alternator, 170 amps
L82	Engine, 5.3L EcoTec3 V8 (AFM - Advanced Fuel Mgmt)
MAH	MAH - MARKETING AREA US, PUERTO RICO/USVI
MSL	PLANT CODE SILAO, MEXICO
MYC	Transmission, 6-speed automatic
NB5	Exhaust, single outlet
NK5	Steering wheel, urethane
NTB
QBN	Tires, 255/70R17 all-season, blackwall
QBR	Tire, spare 255/70R17 all-season, blackwall
Q5U	Wheels, 17" x 8" (43.2 cm x 20.3 cm)
RM7	Wheel, 17" x 8" (43.2 cm x 20.3 cm) full-size, steel spare
RWL
UDC	Driver Information Center
U2J	Sirrius XM Delete
U95	Audio system feature, 2-speakers
V8D	Vehicle Statement US
WMK
X88	7 Way Tailer connector
Z85	Increased Capacity Chassis Package (Trailering Suspension)
1WT	Work Truck
4AA	(some interior trim code)
6PA	(suspension code)
7PA	(suspension code)
8X2	(suspension code??)
9X2	(Suspension Code??)
8624	Touch Up Paint Number - Summit White - WA-8624

[DemonWorks]

Option Codes
*IVH is not the definitive source of GM Vehicle RPO information and is intended for service reference only. Should there be any questions about the vehicle's original build or RPO information please refer to the original vehicle invoice or window sticker.
0ST - VAA/COMPONENT REL FRONT SEAT	1SZ - OPTION PACKAGE DISCOUNT
1WT - WT EQUIPMENT GROUP	2ST - VAA/COMPONENT REL REAR SEAT
3ST - VAA/COMPONENT REL REAR SEAT	4AA - INTERIOR TRIM
4ST - VAA/COMPONENT REL REAR SEAT	5FC - VAA/COMPONENT REL FRONT
5L5 - THEFT DETERRENT SYSTEM FLEET IMMOBILIZER MODIFICATIONS	5ST - VAA/COMPONENT REL REAR SEAT
6PA - COMPONENT FRT LH COMPUTER	7PA - COMPONENT FRT RH COMPUTER
8X2 - COMPONENT RR LH NON-COMPUTER	9X2 - COMPONENT RR RH NON-COMPUTER
A2S - SEAT ADJUSTER, DRIVE 4-WAY MANUAL	A52 - SEATS, FRONT 40/20/40 SPLIT-BENCH
A7E - SEAT ADJUSTER, PASSENGER 4-WAY MANUAL	AED - WINDOWS, POWER FRONT, PASSENGER EXPRESS DOWN
AKP - GLASS, SOLAR ABSORBING, TINTED	AL0 - SENSOR INDICATOR INFLATABLE
AQQ - REMOTE KEYLESS ENTRY	AU3 - DOOR LOCKS, POWER
AXG - WINDOWS, POWER FRONT, DRIVER EXPRESS UP/DOWN	AXK - VEHICLE TYPE TRUCK
AY0 - AIRBAGS DRIVER AND FRONT PASS	B0M - VEHICLE GM PROD WEEK 30
BG9 - FLOOR COVERING, VINYL	BWN - STEPS-CORNER ASSIST, BUMPER
C5U - GVWR, 6,800 LBS. (3,084 KG)	C67 - AIR CONDITIONING
CAP - FLT-COMPETITIVE ASSISTANCE PRGM	D31 - MIRROR, MANUAL INSIDE RR VIEW
D72 - DOOR HANDLES	DLF - MIRRORS, OUTSIDE HEATED POWER-ADJUSTABLE
E2C - ORDER TO DELIVERY EXPEDITE TO CUSTOMER	E35 - PICKUP BOX INNER-STEEL
E63 - PICKUP BED	EF7 - COUNTRY UNITED STATES OF AMERICA (USA)
FE9 - 50-STATE EMISSIONS	FJW - VEHICLE FUEL-GASOLINE E15
FLT - SALES PROCESSING OPTION	GAZ - SUMMIT WHITE
GF5 - TRIM PACKAGE - WORK TRUCK	GU6 - REAR AXLE 3.42 RATIO
H1T - JET BLACK	I19 - ENGINEERING YEAR 2019
IOR - CHEVROLET INFOTAINMENT 3 7" DIAG COLOR TOUCHSCREEN ADDITIONAL FEATURES FOR COMPATIBLE PHONES INCLUDE: BLUETOOTH AUDIO STREAMING VOICE COMMAND PASSTHROUGH TO PHONE, ANDROID AUTO & APPLE CARPLAY CAPABLE	J61 - BRAKES, 4-WHEEL ANTILOCK
JBP - BRAKE LINING WEAR INDICATOR	K34 - CRUISE CONTROL
KC4 - COOLING, EXTERNAL ENGINE OIL COOLER	KC5 - POWER OUTLET, FRONT AUXILIARY, 12-VOLT
KMV - FLT-U-HAUL DAILY RENTAL	KNP - TRANSMISSION OIL COOLER
KW7 - ALTERNATOR, 170 AMPS	L82 - ENGINE, 5.3L ECOTEC3 V8 WITH ACTIVE FUEL MANAGEMENT
MAH - MARKETING AREA US, PUERTO RICO/USVI	MCY - USB PORT
MSL - SILAO, MEXICO PLANT	MYC - TRANSMISSION, 6-SPEED AUTOMATIC
N33 - STEERING COLUMN, TILT-WHEEL, MANUAL WITH WHEEL LOCKING SECURITY FEATURE	NB5 - EXHAUST, SINGLE OUTLET
NE8 - EVAPORATIVE SYSTEM LEVEL 3 EMISSIONS	NK5 - STEERING WHEEL, URETHANE
NTB - EMISSION SYSTEM	Q5U - 17" BRIGHT SILVER PAINTED ALUMINUM WHEELS
QBN - ALL SEASON TIRES	QBR - ALL SEASON SPARE TIRE
QK1 - GATE TYPE-PUBX END STANDARD	QT5 - TAILGATE, WITH LIFT ASSIST AND POWER LOCK
R13 - WT APPEARANCE PACKAGE * BUMPER, FRONT CHROME * BUMPER, REAR CHROME * 17" BRIGHT SILVER PAINTED ALUMINUM WHEELS	R6F - B-CODE ASSIGNMENT VOMS
R9Y - FLEET MAINTENANCE CREDIT	R9Z - POMS EXPEDITE-SOLD ORDERS/TSE
RM7 - WHEEL, 17" FULL-SIZE, STEEL SPARE	RWL - CHASSIS DRIVE LINE-REAR WHEEL DRIVE
SAF - TIRE CARRIER LOCK	SU7 - AXLE RR
TDM - TEEN DRIVER MODE	U2J - DIGITAL AUDIO SYSTEM-S-BAND- NONE
U73 - ANTENNA	U95 - AUDIO SYSTEM FEATURE, SPEAKERS
UDC - DRIVER INFORMATION CENTER, 3.5"	UE0 - ONSTAR DELETE
UHL - FLT-UHAUL PROCESSING OPTION	UIR - INFOTAINMENT DISPLAY- NORMALLY BLACK COLOR (TFT) 7", WVGA 800X480P
UJM - TIRE PRESSURE MONITORING SYSTEM WITH TIRE FILL ALERT	UMN - SPEEDOMETER INST, MILES & KILO, MILES ODOMETER
UVC - REAR VISION CAMERA	V46 - BUMPER, FRONT CHROME
V8D - VEHICLE STATEMENT US	VJH - BUMPER, REAR CHROME
VQ2 - FLEET ORDERING AND ASSISTANCE	VRF - RADIATOR FAN MODULE
VRG - VAA/COMPONENT REL COCKPIT	VRH - VAA/COMPONENT REL STEERING COLUMN
VRK - VAA/COMPONENT REL ROOF TRIM	VRL - VAA/COMPONENT REL FRONT HORIZONTAL SUSPENSION
VRM - VAA/COMPONENT REL FRONT VERTICAL SUSPENSION	VRN - VAA/COMPONENT REL REAR SUSPENSION
VRR - VAA/COMPONENT REL TIRES & WHEELS	VSX - LABEL TOWING
VT7 - OWNERS MANUAL ENGLISH LANGUAGE	WMK - VIN MODEL YEAR 2019
X88 - MARKET BRAND CHEVROLET	YK6 - IDENTIFICATION (SEO)
Z85 - SUSPENSION PACKAGE, STANDARD	ZLQ - WT FLEET CONVENIENCE PACKAGE * REMOTE KEYLESS ENTRY, 2 TRANSMITTERS * TAILGATE, WITH LIFT ASSIST, POWER LOCK, AND RELEASE * CRUISE CONTROL * MIRRORS, OUTSIDE HEATED POWER-ADJUSTABLE * WINDOWS, POWER FRONT, DRIVER EXPRESS UP/DOWN * WINDOWS, POWER FRONT, PASSENGER EXPRESS DOWN * DOOR LOCKS, POWER

[redwngr]

Any chance it's just worn out shocks?

[SteveDillon]

Thanks for all the help, as per Gregs post which lists Z85 as standard suspension I don't think Z85 indicates anything special or "increased capacity chassis package".  Gregs list shows Z85 as standard suspension which seems a lot more correct.

I went to GM parts direct and looked up replacement springs RPO code 6PA and 7PA lead me to very generic springs used in numerous builds.
For the rear spring codes ab<xx>, (abdk, abd3,abd,.abd4) lead you to rear spring rate.  I don't see that code on my build sheet, but again the spring listed seems very generic.
Shocks Rear are indicated with RPO code ad<xx>, Shocks front are chosen by a few codes.  My shocks are pretty generic.
I never saw z85 listed as a determining factor in picking Springs or Shocks.

I'll be ordering bilsteins soon.  
I think this will be funny in a truck forum: earlier this year, I upgraded my 1993 Miata from original, still working, Bilsteins with  143k miles, to Fox Coilovers.  Yup my tiny little Miata has Fox suspension.
 

[SteveDillon]

11 hours ago, redwngr said:

Any chance it's just worn out shocks?

I bought it used (but only 17k miles) so I can't rule that out, I've seen enough others on here with complaints about bouncy ride that this could be how it shipped from factory.
Looking at prices on 4 shocks, it appears to be about $150-200 extra to go to Bilsteins compared to replacing all 4 with OEM, so i'll just upgrade. 

[Osceola]

I know we’re talking about suspension improvements. My 2015 Yukon SLT has max towing package. My veh could use. Little more lift when towing my Lakota bumper pull LQ horse trailer. I do use a Reese heavy duty weight distribution kit with round bars. The air shock OEM compressor seems to go on a lot when under tow. Is this normal? I thought about installing Firestone air bags to rear coil springs for a more stable ride. I know I don’t have Adaptive Air ride like the newer GM Yukons. But will these air bags help and can they be installed in this 2015 Yukon?

[swathdiver]

4 hours ago, Osceola said:

I know we’re talking about suspension improvements. My 2015 Yukon SLT has max towing package. My veh could use. Little more lift when towing my Lakota bumper pull LQ horse trailer. I do use a Reese heavy duty weight distribution kit with round bars. The air shock OEM compressor seems to go on a lot when under tow. Is this normal? I thought about installing Firestone air bags to rear coil springs for a more stable ride. I know I don’t have Adaptive Air ride like the newer GM Yukons. But will these air bags help and can they be installed in this 2015 Yukon?

 

Yes, it is normal for the compressor to run to try and keep the truck level.  But you should still inspect your shocks and the system for leaks.  They often need replacing at around year 8.

 

I thought that the Firestone "bags" go where the jounce bumpers go and the AirLift Springs go inside the coils?

 

Either way, they will certainly help steady the load.  Actually, if memory serves, the AirLift Springs that go inside the coils are not for use with with the air ride suspension.