Didn't have time to fully look through the whole page this morning. I was curious about the RPO code on that axle where the flange is real close to the axle tube. I see that on the 8.5 axles but not the 9.5. The 9.5 seems to have more spacing away from the axle tube.
I'll look at that page this afternoon, it had a lot of data on it.
It came from a 2011 Escalade:
1GYS3KEF3BR252701
1SD PACKAGE OPTION 04
1SZ DISCOUNT OPTION PACKAGE
415 TRIM COMBINATION LEATHER, VERY LIGHT LINEN/COCOA ANILINE, (05) (08)
41I INTERIOR TRIM VERY LIGHT LINEN/COCOA (I) (08)
6LL COMPONENT FRT LH COMPUTER SEL SUSP (6LL)
7LK COMPONENT FRT RH COMPUTER SEL SUSP (7LK)
98U PRIMARY COLOR EXTERIOR, WHITE DIAMOND (02)
A31 WINDOW POWER OPERATED, ALL DOORS
AG1 ADJUSTER FRT ST POWER, MULTI-DIRECTIONAL, DRIVER
AG2 ADJUSTER PASS ST POWER, MULTI-DIRECTIONAL
AJ1 WINDOW TINTED DEEP, ALL EXCEPT W/S AND DRS
AJ7 RESTRAINT SYSTEM SEAT, INFLATABLE, DRIVER & PASS, FRT & SEAT SIDE
AL0 SENSOR INDICATOR INFLATABLE RESTRAINT, FRT PASS/CHILD PRESENCE DETECTOR
AL4 SEAT RR BKT
AN3 SEAT FRT, INDIVIDUAL (NON BKT)
AP3 LOCK CONTROL, ENTRY REMOTE, KEYLESS ENTRY, START
ARL PLANT CODE ARLINGTON, TX, USA
ARS ADJUSTER RR REAR SEAT, POWER, STOWABLE
AS3 SEAT REAR UTILITY
ASF RESTRAINT ROOF SIDE, LH & RH, INFLATABLE
AU3 LOCK CONTROL SIDE DR, ELEC
AXN IDENTIFICATION 9.5" LIGHT DUTY BEAM
AXP VEHICLE TYPE MULTI-PURPOSE PASSENGER VEHICLE
AYE RESTRAINT HEAD, RR SEAT, ANILINE LEATHER (WITH DVD)
B30 COVERING FLOOR CARPET
B39 COVERING FLOOR CARPET, LOAD FLOOR
B58 COVERING FLOOR MAT, FRT & RR, CARPETED INSERT
B85 MOLDING B/S EXTERIOR, BRIGHT
BRS STEPS, RUNNINGBOARD SIDE, RETRACTABLE, POWER
BS1 INSULATION ACOUSTICAL PKG
C25 WIPER SYSTEM RR WINDOW, INTERMITTENT
C36 HEATER AUXILIARY
C49 DEFOGGER RR WINDOW, ELECTRIC
C5Z GVW RATING 7, 200 LBS
C69 HVAC SYSTEM RR AIR CONDITIONER
CF5 ROOF SUN, GLASS, SLIDING, ELEC
CJ2 HVAC SYSTEM AIR CONDITIONER FRT, AUTO TEMP CONT, AUX TEMP CONT
D07 CONSOLE FRT COMPT, FLOOR, CUSTOM
DCP PROCESSING DIRECTIONS & CONNECTIONS SERVICE PACKAGE
DD8 MIRROR I/S R/V LT SENSITIVE
DH6 MIRROR I/S FRT VAN LH & RH, SUNSHADE, ILLUM
DK8 CONSOLE ROOF INTERIOR, DELUXE
DL3 MIRROR O/S LH & RH, REMOTE CONTROL, ELECTRIC, HEATED POWER FOLDING, TURN SIG IND, LT SENSITIVE, COLOR
DNU EQUIPMENT ADDITIONAL DVD SCREEN
DT4 ASHTRAY CIGARETTE LIGHTER
E2C ORDER TO DELIVERY EXPEDITE TO CUSTOMER
E52 BODY EQUIPMENT ONE PIECE LIFT GATE WITH LIFT GLASS
E61 DOOR RR LIFTGATE, POWER
EF7 COUNTRY UNITED STATES OF AMERICA (USA)
FE9 CERTIFICATION EMISSION, FEDERAL
FHS VEHICLE FUEL GASOLINE E85
G69 LEVEL CONTROL AUTO, AIR, HD
G80 AXLE POSITRACTION LIMITED SLIP
GMQ RADIO AM/FM STEREO, SD NAV, DVD-ROM, CAF, USB, RSA, VOIC E REC, AUX JACK
GU6 AXLE REAR 3.42 RATIO
HNE EQUIPMENT HEAT & COOLED CUPHOLDERS
JD9 BRAKE VAC POWER, 17" DISC/DISC, W/VSES, 7700 LBS
JF4 PEDALS ADJUSTABLE, POWER
JL4 CONTROL ACTIVE BRAKE
K34 CRUISE CONTROL AUTOMATIC, ELECTRONIC
KA6 HEATER SEAT, RR
KA9 HEATER STEERING WHEEL
KB6 HEATER SEAT, COOLING, FRT
KC4 COOLING SYSTEM ENG OIL
KNP COOLING SYSTEM TRANS, HD
KW1 GENERATOR 160 AMP
L94 ENGINE FLEXIBLE FUEL, (GAS/ALC), 8 CYL, 6.2L, SFI, ALUM CYL DEACTIVATION, GM
MYC TRANSMISSION AUTO 6 SPD, HMD, 6L80
N30 STEERING WHEEL DELUXE
NT7 EMISSION SYSTEM FEDERAL, TIER 2
NZ4 WHEEL SPARE 17 X 7.5, J, STEEL, DESIGN 2
QST TIRE ALL P285/45R22 BW TL AL2
R7V CONTROL SALES ITEM NO. 46
R9I CONTROL SALES ITEM NO. 84
R9N CONTROL SALES ITEM NO. 89
R9Z CONTROL SALES ITEM NO. 100
S85 WHEEL 22 X 9, ALUM, CHROME, FLANGED
SAF LOCK SPARE TIRE, HOIST SHAFT
SLL SALES PROCESSING SOLD ORDERS
T4Q HEADLAMPS LED, RH RULE OF ROAD, FMVSS
T74 HEADLAMPS CONTROL AUTOMATIC, DELAY
T96 LAMP FOG, FRT
TGA LANGUAGE CONTROL ENGLISH, FRENCH, SPANISH
TL1 GRILLE SPECIAL
TQ5 CONTROL INTELLIGENT HIGH BEAM
U42 ENTERTAINMENT PKG REAR SEAT, SINGLE DISPLAY, REM CONTROL, AUX JACK 2-WIRELESS DUAL CHANNEL HEADPHONES
U84 ANTENNA BODY SIDE WINDOW, RADIO
UBS DIGITAL AUDIO SYSTEM S-BAND AND TRAFFIC
UD7 SENSOR INDICATOR REAR PARKING ASSIST
UE1 COMMUNICATION SYSTEM VEHICLE, G.P.S. 1
UFT SENSOR INDICATOR SIDE OBSTACLE DETECTION
UG1 OPENER GARAGE DOOR, UNIVERSAL
UJM TIRE PRESS INDICATOR MANUAL LEARN
UK3 CONTROL STEERING WHEEL, ACCESSORY
UK6 RADIO CONTROL RR SEAT & EARPHONE JACKS
ULT APPEARANCE PACKAGE CADILLAC ESCALADE, PLATINUM
UPF WIRELESS INTERFACE SHORT RANGE, VOICE REC
UQS SPEAKER SYSTEM PREMIUM AUDIO BRANDED WITH SURROUND AMPLIFIER
USR RECEPTACLE USB
UVC CAMERA REAR VIEW
V1K BAR LUGGAGE CARRIER, CENTER CROSS
V54 LUGGAGE CARRIER ROOF, PAINTED
V8D VEHICLE STATEMENT US
VFF VIDEO FORMAT REGION 1, NTSC
VGD FASCIA FRT, CUSTOM, BODY COLOR
VGE FASCIA RR, CUSTOM, BODY COLOR
VH9 ENVELOPE OWNER INFO MAN
VPV HANDLING CHARGE ARLINGTON ASM TO KERR INDUSTRIES, ARLINGTON, TX AND RETURN TO ARLINGTON ASM
VR4 TRAILER HITCH WEIGHT DISTRIBUTING PLATFORM
VT7 OWNERS MANUAL ENGLISH LANGUAGE
VZ2 CALIBRATION SPEEDOMETER A
XL7 FREQUENCIES RATING 315 MHZ, LONG DISTANCE
Y91 MERCHANDISED PKG LUXURY EDITION
YD3 AXLE (BASE EQUIP) FOR SCHEDULING GVW PLATE
YD5 SPRING FRONT BASE EQUIPMENT
YD6 SPRING RR, BASE EQUIPMENT
YE9 CONVENIENCE PKG COMFORT & DECOR LEVEL #3
Z75 CONVERSION NAME PLT CADILLAC
Z82 TRAILER PROVISIONS SPECIAL EQUIPMENT, H.D.
Z95 CHASSIS PACKAGE MAGNERIDE
ZRS TIRE SPARE P265/70R17-113S
ZY1 COLOR COMBINATION SOLID
ALL of the GMT900 1500s are like that. You know how I know, besides the pictures and seeing them side by side? There's only one part number for the parking brake anchor block. That and the dust shield is what bolts up to that. The one for the '09 Hummer is way different.
I kinda think I know why you discount the photo with the tape measure on both axles. I was in the heavy equipment parts business and like you, saw tons of parts that were only minutely different from one another. Our air spring catalogs seemed like they were a foot thick back then!
I would normally find it odd that GM put the AXN on an AWD truck when they hadn't done so for many years but since it was the end of the model run and the new generation was using a different axle, it makes sense that they would use up all their extra parts. Saw this with the GM G-Bodies in the 1980s.