GM Service Manual Online
For 1990-2009 cars only

RPO

Description

AU7

Key Common, Fleet

BPU

First Position Prop Hanger, NON-BOC, Height A

BPV

First Position Prop Hanger, NON-BOC, Height B

BPW

First Position Prop Hanger, NON-BOC, Height C

EG4

Wheelbase 157 Inch

EL4

490 cm (193 in) Wheelbase

EQ4

582 cm (229 in) Wheelbase

ERA

Second Position Prop Hanger, Height A

ERB

Second Position Prop Hanger, Height B

ERC

Second Position Prop Hanger, Height C

ER7

612 cm (241 in) Wheelbase

ET7

658 cm (259 in) Wheelbase

EY1

Yoke: Propeller Shaft, Driveline, Dana®

FD0

Frame: Rail, Full Depth, 612x15 cm (241x6 in), 22 680 kg (50,000 lb)

FD2

696 cm (274 in) Wheelbase

FD5

Frame: Rail, Full Depth, 622x20 cm (245x8 in), 36 288 kg (80,000 lb)

FF1

Hub: Front, Oil-Filled

FL1

Axle: Front, 3 674 kg (8,100 lb)

FM6

Axle: Front, 4 536 kg (10,000 lb)

FNV

445 cm (175 in) Wheelbase

FN0

Suspension: Front, Taperleaf, 4 989 kg, (11,000 lb)

F14

Suspension: Front, Tapered Leaf, 3 674 kg (8,100 lb)

F15

Suspension: Front, Tapered Leaf, 4 082 kg (9,000 lb)

F43

Axle: Front, 4 082 kg (9,000 lb)

F59

Stabilizer Shaft: Front

GG0

Suspension: Rear, Multileaf, 6 804 kg (15,000 lb)

GN0

Suspension: Rear, Multileaf, 8 618 kg (19,000 lb)

GN1

Stabilizer Shaft: Rear

GN2

Suspension: Rear, Tapered Leaf, 8 618 kg (19,000 lb)

GN8

Suspension: Rear, Multileaf, 9 526 kg (21,000 lb)

GQB

Third Position Prop Hanger, Height A

GQC

Third Position Prop Hanger, Height B

GQD

Third Position Prop Hanger, Height C

GQ0

Suspension: Rear, Tapered Leaf, 6 804 kg (15,000 lb)

GR9

Suspension: Rear, Tapered Leaf, 9 526 kg (21,000 lb)

G68

Shock Absorbers: Rear, Heavy Duty

G86

Axle: Limited Slip

G98

Seal: Rear Axle Oil, Stemco®

HPK

Axle: Rear, Eaton® 19000, Two Speed, 8 618 kg (19,000 lb)

HPM

Axle: Rear, Eaton® 19060T, Two Speed, 8 618 kg (19,000 lb)

HPP

Axle: Rear, Eaton® 21060S, Single Speed, 9 526 kg (21,000 lb)

HPZ

Control: Rear Axle Shift, Two Speed, Electric

HR2

Control RR Axle Shaft, Full Air, Trans LVR Mounted

H08

Axle: Rear, Dana® S150-S, Single Speed, 6 804  kg (15,000 lb)

H10

Axle: Rear, Eaton® 15040S, Single Speed, 6 804 kg (15,000 lb)

JE3

Brake: Hydraulic

JE4

Brake: Air

JE5

Braking System: Antilock

JQB

Universal Joint: Main, 1480/148N Series

JQF

Adjuster: Rear Slack, Automatic, Rockwell®

JQM

Universal Joint: Main, 1710/17N Series

JQP

Universal Joint: Main, 1550/155N Series

JQR

Universal Joint: Main, 1610/161N Series

JRF

Shield: Rear Brakes, Dust

JRG

Brake Rating:Frt Air Abex, 197, Non Asbestos lining, 5.5 in Slack 15X4,. Fab shoe& 4 or 8 Hole Mtg.

JRI

Brake Rating: Rear, Air Abex 197 Non-Asbestos Lining, 14 cm (5.5 in) Slack, 42x18 cm (16.5x7 in) Fab Shoe, 10 Hole Mounting

JTF

Brake Adjuster Front Slack, Rockwell® Manual

JTG

Brake Adjuster Rear Slack, Rockwell® Manual

JTJ

Brake Adjuster Eaton Automatic RR

JTK

Brake Adjuster Eaton Automatic FRT

JTT

Air Dryer B/W Model, AD9 Heated, Brake Air Tank

JTW

Air Dryer B/W Model, AD-SP, Heated, Brake Air Tank

JUE

Brake Adjuster: Front Slack, Rockwell® Automatic

JVA

Provisions Antilock Brake Delete

JXG

Valve: Air Brake Moisture Ejector, B/W DV2, Heated, Front

JZC

Chamber: Front Brake, Type 16

JZD

Chamber: Front Brake, Type 20

JZF

Chamber: Rear Brake, Type 30

J78

Valve: Moisture Ejector Air Brake

J82

Valve: Front Air Brake, Limiting

KA2

Engine Coolant Heater: 115 V, 1500 Watt w/Cord

KA4

Engine Coolant Heater: 120 V, 1000 Watt W/Cord

KC1

Filter: Oil, Luberfiner 750C

KG3

Generator: 145 AMP

KG8

Generator: 130 AMP

KNB

Air Cleaner: Dry

KPJ

Engine Shutdown: Automatic

KPS

Oil Cooler: Engine

KQR

Starter: HD, Overcrank Protection

KRG

Air Cleaner: Dry Inside Type

KRW

Hose: Radiator, Silicone

KTE

Injector: Ether, Start System

KUK

Separator, Fuel/water, Racor Cold Weather Non Heated

KUN

Separator, Fuel/Water, Davco, Heated, 200 Series

KUS

Air Cleaner: Dual Element

KUV

Air Compressor B/W, 13.2 CFM, Water Cooled For Accessory Drive

KUW

Fan Clutch Drive-Cold Weather

KVB

Hose: Water, Silicone, Except Radiator

KW1

Generator: 160 AMP

KYG

Air Intake: Air Compressor Plumbed to Engine Air Cleaner

KYR

Governor Vehicle Speed- 65 mph

KZX

Air Compressor: B/W, 13.2 CFM, Water Cooled

K05

Heater: Engine Coolant

K34

Cruise Control: Automatic, Electronic

K40

Engine Brake: Exhaust

K53

Fuel Sender, Robust Fuel System

K67

Starter Engine, Heavy Duty

LG5

Engine: Diesel, 7.2L, L6 Turbo, Electronic

LQA

Power Option: Caterpillar® 3126, 7.2L, 270 gross hp @ 2300 RPM

LQQ

Power Option GMPT V8, 8.1L, 210 nET HP @ 3, 800 RPM

LQY

Power Option GMPT V8, 8.1L, 270 NET HP @ 3, 800 RPM

LSV

Engine: Caterpillar® 3126, 7.2L 130.6 kW (175 hp) @ 2200 RPM

LSX

Engine: Caterpillar® 3126, 7.2L 210 gross hp @ 2200 RPM

LVA

Governor Vehicle Speed-60 mph

LVR

Power Option Caterpillar 3116, 6.6L, 170 Gross HP @ 2600 RPM

LVX

Power Option Caterpillar 3116, 6.6L, 185 Gross HP @ 2600 RPM

L18

Engine Gas, 8 Cyl, 8.1L, MFI

MF1

Transmission: Allison® AT545, Automatic

MK0

Transmission: Manual, 5-Speed, Eaton®, 7.22 1st, 1.39 4th, Direct Drive

MM7

Transmission Manual 6 Speed, Eaton BOOS SYNC, 9.01 1st, 560 FT LBS Direct Drive

MPJ

Clutch, Cerametallic, 33 cm (13 in), Eaton® Valeo

MPU

Transmission: Eaton® FS5005A, Manual, 5-Speed

MSC

Transmission: Eaton® FS4005B, Manual, 5-Speed

MTD

Clutch: 14-1 Cerametallic, Eaton-Valeo®, Pull Type

MTW

Transmission, Auto 5-Speed, Allison, LCT 2400, w/PTO Drive, Gear and Park Pawl

MWE

Pilot Shaft: Automatic Transmission, No Spline

MWM

Clutch 14-1 Cerametalix, Pull Type, Spicer Greasable Bearing

MWW

Pilot Shaft Transmission, 44.45 mm (1.75 in) Spline

MWX

Pilot Shaft: Transmission, 38.1 mm (1.5 in) Spline

MX4

Transmission, Auto 5-Speed, Allison, LCT 2000, 3.51 1st, 1.00 4th, 0.73 5th, O/D, Conv Clutch

MZE

Clutch 14-2 Cerametalix, Pull Type Greasable Bearing

M1F

Power Take Off, Rear

NB5

Exhaust System: Single

NC2

Exhaust System: Single

NH9

Fuel Tank: 227 L (60 Gal), Right Rectangular

NJ2

Fuel Tank: Temporary

NL9

Fuel Tank: 132 L (35 Gal), Right Rectangular

NM8

Leaded Fuel System: Compatible

NRZ

Exhaust Emission Control: Diesel, W/O Converter

NWB

Separator: Racor Spin-On, Fuel/Water

NXN

Fuel: 57 L (15 Gal) Additional

NXW

Steering: Power, TRW Ross

NYB

Fuel Tank: 227 L (60 Gal), Left Rectangular

N1B

Exhaust System Side Exit

N33

Steering Column: Tilt Type

N40

Steering: Power, Non-Variable Ratio

PNB

Wheel: Polished Aluminum, Both Sides, Rear

PNQ

Angle: Rear Axle Pinion, Nominal 3°

PNR

Angle: Rear Axle Pinion, Nominal 4°

PNS

Angle: Rear Axle Pinion, Nominal 5°

PNX

Angle: Rear Axle Pinion, Nominal 6°

PNY

Angle: Rear Axle Pinion, Nominal 7°

PQB

Wheel: Front, Generic Steel, 10 Hole, 287.75 mm (11.25 in) BC BS, Disc

PQJ

Wheel: Front, Cast, 20 x 22.5

PQK

Wheel: Rear, Cast, 20 x 22.5

PQR

Wheel: Front Generic, 8 Hole, 275 mm (10.8 in), BC, FN

PQS

Wheel: Rear Generic, 8 Hole Disc, 275 mm (10.8 in) BC, FN

PQU

Wheel: Front, Generic Steel, 10 Hole, 287.75 mm (11.25 in), BC Piloted, Disc

PQV

Wheel: Rear, Generic Steel, 10 Hole, 287.75 mm (11.25 in), BC, Piloted, Disc

PQY

Wheel: Front, Generic 10 Hole, 287.75 mm (11.25 in), BC, Aluminum, Hub Piloted

PQZ

Wheel: Rear, Generic 10 Hole, 287.75 mm (11.25 in), BC, Aluminum, Hub Piloted

P53

Tire Tread, Spare Tread and Brand, Front Match

P54

Tire Tread, Spare Tread and Brand, Rear Match

QH3

Wheel: Front, 22.5x7.50, 10 Hole, 287.75 mm (11.25 in) BC, FN, Hub Piloted

QH4

Wheel: Rear, 22.5x7.50, 10 Hole, 287.75 mm (11.25 in) BC, FN, Hub Piloted

QK1

Wheel: Front, 20x7.5, 5° Rim

QK2

Wheel: Rear, 20x7.5, 5° Rim

QM1

Wheel: Front, 22.5x7.5, Rim DCT

QM2

Wheel: Rear, 22.5x7.5, Rim DCT

QM6

Wheel: Front, 22.5x8.25, Rim DCT

QM7

Wheel: Rear, 22.5x8.25, Rim DCT

Q82

Wheel: Front, 19.5x6.0, 8 Hole, 275 mm (10.8 in), BC, FN

Q83

Wheel: Rear, 19.5x6.0, 8 Hole, 275 mm (10.8 in), BC, FN

RLE

Wheel: Front, 22.5x7.5, 10 Hole, 287.75 mm (11.25 in) BC, BS, DCT, BAL, (FI-27403)

RNH

Wheel Front 22.5 X 8.25, 10 Hole, 285.75 MM BC Piloted Hub Aluminum (AKW RA29555)

RNN

Wheel RR 22.5 X 8.25, 10 Hole, 285.75MM BC Piloted Hub Aluminum (AKW RA 29555)

RPQ

Wheel: Front, 22.5x8.25, 10 Hole, 285.75 mm (11.25 in) BC, Piloted Hub

RPR

Wheel: Rear, 22.5x8.25, 10 Hole, 285.75 mm (11.25 in) BC, Piloted Hub

RQ2

Vehicle Application: Truck Service

RRS

Wheel: Front, 22.5x8.25, 10 Hole, 285.75 mm (11.25 in) BC BS, DCT, (FI-27404)

R3B

Front Tire: Extra Strength Highway Tread

R3C

Front Tire: Premium Highway Tread

R3J

Front Tire: Highway Traction Block Tread

R3K

Front Tire: On/Off Road Rib Tread

R3N

Front Tire: Premium Highway Improved Steering Control Tread

R4A

Front Tire Brand: Goodyear

R4H

Front Tire Brand: General

R4L

Front Tire Brand: Michelin

R4N

Front Tire Brand: Bridgestone

R4R

Front Tire Brand: Select, Brand Plant

SNF

Wheel: Spare, Front

SNR

Wheel: Spare, Rear

S3B

Tire Tread: Rear, Extra Strength Highway

S3C

Tire Tread: Rear, Premium Highway

S3D

Tire Tread: Rear, Highway Premium

S3H

Tire Tread: Rear, Highway

S3J

Tire Tread: Rear, Highway Traction

S3K

Tire Tread: Rear, On/Off Road Rib

S3M

Tire Tread: Rear, All Season

S3R

Tire Tread Rear Highway Traction-High Center of Gravity

S4A

Rear Tire Brand: Goodyear

S4H

Rear Tire Brand: General

S4L

Rear Tire Brand: Michelin

S4N

Rear Tire Brand: Bridgestone

S4R

Rear Tire: Select, Brand Plant

TM0

Battery: Dual

TM1

Battery: Single

TM2

Battery: Single, Delco® Freedom

TNL

Battery: Twin, 12V (1110)

TNN

Battery: Twin, Delco® 1150, 12V

TNR

Battery: Three, Delco® 1150, 12V

TRF

Tires: Front, Radial Identifier

TRG

Tire Select Front Brand Customer

TRH

Tire Select Rear Brand Customer

TXA

Equipment Easy Lift Hood

UF3

High Idle Switch

UXQ

Gage: Metric package

UXT

Gage: Transmission Temperature

U31

Gage Ammeter

VWU

Grille Argent Silver

V01

Radiator: Heavy Duty

V04

Shutters, Radiator

V14

Transmission: Cooler Oil

V76

Hook: Tow

XRL

Tire: Front, 235/80R22.5/G, 14PR,BL TL Radial

XRN

Tire: Front, 295/75R22.5/G, 14PR, BL TL Radial

XSB

Tire: Front, 255/80R22.5/G, 14PR, BL TL Radial

XSH

Tire: Front, 275/80R24.5/G, 14PR, BL TL Radial

XTI

Tire: Front, 245/70R19.5/F, 12PR, BL TL Radial

XTQ

Tire: Front, 245/75R22.5/G, BL TL Radial

XTU

Tire: Front, 265/75R22.5/G, BL TL Radial

XTY

Tire: Front, 245/70R19.5/G, 14PR, BL TL Radial

XUE

Tire: Front, 9.00R22.5/G, 12PR, BL Radial TL

XUN

Tire: Front, 9.00R20.0/F, 12PR, BL Radial TT

XWH

Tire: Front, 10.00R20/G, 14PR, BL Radial TT

XWJ

Tire: Front, 10.00R22.5/F, 12PR, BL Radial TL

XWK

Tire: Front, 10.00R22.5/G, 14PR, BL Radial TL

XWL

Tire: Front, 11.00-R22.5/G, 14PR, BL Radial TL

X80

Plate GVW Rating

X88

Name Plate: Chevrolet

YRL

Tire: Rear, 235/80R22.5/G, 14PR, BL TL Radial

YRN

Tire: Rear, 295/75R22.5/G, 14PR, BL TL Radial

YSB

Tire: Rear, 255/80R22.5/G, 14PR, BL TL Radial

YSH

Tire: Rear, 275/80R24.5/G, 14PR, BL TL Radial

YTI

Tire: Rear, 245/70R19.5/F, 12PR, BL TL Radial

YTQ

Tire: Rear, 245/75R22.5/G, BL TL Radial

YTU

Tire: Rear, 265/75R22.5/G, BL TL Radial

YTY

Tire: Rear, 245/70R19.5/G, 14PR, BL TL Radial

YUE

Tire: Rear, 9.00R22.5/F, 12/PR, BL Radial TL

YUN

Tire: Rear, 9.00R20.0/F, 12PR, BL Radial TT

YU8

Wheel: Single, Polished Aluminum, One Side, Front

YWH

Tire: Rear, 10.00R20/G, 14PR, BL Radial TT

YWJ

Tire: Rear, 10.00R22.5/F, 12PR, BL Radial TL

YWK

Tire: Rear, 10.00R22.5/G, 14PR, BL Radial TL

YWL

Tire: Rear, 11.00R22.5/G, 14PR, BL Radial TL

YX7

Attachment Main Driveline Two-Shaft System

YX8

Attachment Main Driveline Three-Shaft System

YX9

Attachment Main Driveline Four-Shaft System

ZRL

Tire: Spare, 235/80R22.5/G, 14PR, BL TL Radial

ZRN

Tire: Spare, 295/75R22.5/G, 14PR, BL TL Radial

ZSB

Tire: Spare, 255/80R22.5/G, 14PR, BL Radial TL

ZSH

Tire: Spare 275/80R22.5/G, 14PR, BL Radial TL

ZTI

Tire: Spare, 245/70R19.5/F, 12PR BL TL Radial

ZTY

Tire: Spare, 245/70R19.5/G PR BL Radial

ZUE

Tire: Spare 9.00R22.5/F, 12PR, BL TL Radial

ZUN

Tire: Spare, 9.00-20.0/F, 12PR, BL Radial TT

ZWH

Tire: Spare, 10.00R20/G, 14PR, BL Radial TT

ZWJ

Tire: Spare, 10.00R22.5/F, 12PR, BL Radial TT

ZWK

Tire: Spare, 10.00R22.5/G, 14PR, BL Radial TT

ZWL

Tire: Spare, 11.00R22.5/G, 14PR, BL Radial TT

Z88

Conversion Nate Plt GMTB

001

3.70 Ratio Code

002

4.11 Ratio Code

003

4.33 Ratio Code

004

4.78 Ratio Code

005

4.56 Ratio Code

006

4.63 Ratio Code

008

4.88 Ratio Code

009

5.29 Ratio Code

011

5.57 Ratio Code

012

5.83 Ratio Code

013

3.73 Ratio Code

014

6.14 Ratio Code

015

6.17 Ratio Code

017

6.50 Ratio Code

022

7.17 Ratio Code

034

3.54 Ratio Code

035

3.54 Ratio Code

036

6.57 Ratio Code

038

6.57 Ratio Code

039

3.55 Ratio Code

051

6.43 Ratio Code

057

3.36 Ratio Code

066

4.10 Ratio Code

069

3.90 Ratio Code

070

5.38 Ratio Code

071

3.91 Ratio Code

41P

Wheel Color: Black

7Y4

Meter Engine, Hour

71L

Secondary Color: Exterior, Red Orange

71U

Primary Color: Exterior, Red Orange

86L

Secondary Color: Exterior, Wheatland Yellow

86U

Primary Color: Exterior, Wheatland Yellow

91U

Primary Color: Exterior, Black, Low Gloss