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End of first post is a PDF with all GM RPO codes. Following posts have many entries per year. HTH!
Truck RPO Codes
TYPICAL GLOVE COMPARTMENT LABEL
(RPO CODES)
RPO is GM shorthand for Regular Production Option. These code describe the details of any Vehicle
This is aa aproximation of the RPO Code label that is found in all GM vehiles at the time of manufactiure.
Service Parts Identification 10108227 DO NOT REMOVE
1GNEC16K6RJXXXXXX 131.5 CC10906
AG9 AJ1 AS3 AT5 AU3 AU6 AXP A31 A95 B33 B37 B85 B96
C5U C60 C69 DK6 D48 D55 E55 GT4 JAN JB6 K34 K68 LO5
MX0 M30 NA1 NB2 NK3 NRQ N33 P06 QHA R7M SLM TR9 UX1
U16 U88 VG8 VK3 VP6 VXS V08 V22 V27 V73 XHA X88 YA7
YD3 YD6 YE9 YF5 YHA ZHA ZQ2 ZQ3 ZY1 1SB 1SZ 13D 13I
50U 6WN 7WN
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TRUCK ENGINE CODES RPO ENGINE TYPE VIN 8
LB4 4.3L V6 TBI Z
L35 4.3L V6 CPI W
L03 5.0L V8 TBI H
L05 5.7L V8 TBI K
L19 7.4L V8 TBI N
LL2 2.8l V6 TBI R
LL4 6.2L V8 DIESEL J
LN8 2.5l L4 TBI E
EMISSIONS CODES RPO EMMISIONS
NA1 UDER 8500 GVW
NA4 OVER 8500 GVW
NA5 FEDERAL
NB6 CALIF, TIER 1
NB7 CALIF, TLEV
NA6 HIGH ALTITUDE
NF2 FED, TIER 1
NM8 LEADED FUEL COPMPATABLE
NN8 UNLEADED FUEL, EXPORT
NB2 CALIFORNIA
NRQ CC EXHAUST (T1)
FINAL DRIVE OPTION CODES RPO FINAL DRIVE
GU2 2.73:1
GU4 3.08:1
GU5 3.23:1
GU6 3.42:1
G44 3:.07:1
GT4 3.73:1
GT5/GT8 4.10:1
GM1 2:59.1
HC4 4.56:1
AUTOMATIC TRANSMISSIONS RPO HMD TYPE DESCRIPTION
A3/M40 TH400/3L80 3 SPD (HD) NON - ELECTRONIC SHIFT ECM KICK DOWN CNTL
1st 2.48
2nd 1.48
3rd 1.00
R 2.08
A3 TH350/3L60 3 SPD (STD)
1st
2nd
3rd
R
MD8/A4 TH700R4/4L60 4 SPD NON - ELECTRONIC SHIFT ECM LOCK TORQUE CONVERTER
1st 3.06
2nd 1.63
3rd 1.00
4th 0.70
R 2.29
MD9 TH125R4 3 SPD NON - ELECTRONIC
ECM LOCK TORQUE CONVERTER
M30 4L60E 4 SPD OD PCM CONTROLED SHIFT
PCM LOCK TORQUE CONVERTER
1st 3.06
2nd 1.63
3rd 1.00
4th 0.70
R 2.29
MT1 4L80E 4 SPD OD, (HD) PCM CONTROLED SHIFT
PCM LOCK TORQUE CONVERTER
1st 2.48
2nd 1.48
3rd 1.00
4th 0.75
R 2.08
MANUAL TRANSMISSIONS RPO TYPE DESCRIPTION
M4 4 SPD MUNCIE
1st
2nd
3rd
4th
R
M28 6 SPD Borg-Warner, 85nn
1st 3.63
2nd
3rd 1.35
4th
5th
6th
R
MCO 4 SPD MUNCIE/GETRAG, (310 ft lbs)
1st 4.02
2nd 2.30
3rd 1.40
4th 1.00
R 3.74
ML9 6 SPD ZF, 90 mm, OD
1st 2.68
2nd
3rd
4th
5th
6th
R
268 5 SPD MUNCIE/GETRAG, w/OD, (310 ft lbs)
1st 4.02
2nd 2.30
3rd 1.40
4th 1.00
5th 0.73
R 3.74
MY2 5 SPD MANUAL, HMD w/OD
1st 4.02
2nd
3rd
4th
5th
R
MY6 4 SPD MANUAL NEW PROCESS
1st 3.09
2nd
3rd
4th
R
MT8 5 SPD 5 SPEED MANUAL W/Deep Low
1st 6.34
2nd 3.44
3rd 1.71
4th 1.00
5th 0.73
R 6.34
MM5 5 SPD 5 SPEED MANUAL W/OD
1st 4.02
2nd 3.23
3rd 1.40
4th 1.00
5th 0.73
R 3.74
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