GM RPO Code Database

Search the code list

24,366

codes on file

51,776

documented meanings

1973–2026

model years

Type a code, or describe the option in words. Every entry says where the meaning came from and which years we hold it for, because an RPO code can mean different things in different eras and a list that hides that is worse than no list.

Code or description

Model year

Sourcing Any From a GM document Corroborated GM option master, dated General reference Provisional

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The full list, A to Z

Showing 601–700 of 741 codes beginning with G. One meaning shown per code — the best-sourced one we hold. Search above for the rest.

Code	Meaning	Years	Sourcing
GSR	Family Code, Window Side DR	1991	GM dated
GSS	Primary Color Exterior, Ferrari Red	—	Reference
GST	Primary Color Exterior, Mirage Glow (719u)	—	Reference
GSU	Primary Color Exterior, Chlorophyll	—	Reference
GT1	P, RAX, M, AXLE REAR, 5.625 RATIO, 10,500 KG	1999	GM sourced
GT2	P, RAX, M, AXLE REAR, 4.77 RATIO	1999	GM sourced
GT3	P, RAX, M, AXLE REAR, 4.55 RATIO	1999	GM sourced
GT4	Rear axle, 3.73 ratio	2026	GM sourced
GT5	Rear axle, 4.10 ratio	2019	Reference
GT6	P, RAT, M, RATIO, TRANSAXLE FINAL DRIVE 4.19 (USE OPTION FV5)	1997	Provisional
GT7	P, RAX, M, AXLE REAR, 3.33 RATIO	1984	GM sourced
GT8	Axle,heavy Duty Rear,4.10 Ratio	—	Reference
GT9	P, RAX, M, AXLE REAR, 2.87 RATIO, 10620 E, 8	—	Provisional
GTA	Model Conversion Turbo GT	—	Reference
GTB	Model Conversion Turbo HO	—	Reference
GTF	Appearance Package Special Edition 'g5'	—	Reference
GTH	Primary Color Exterior, Yellow (5456)	—	Reference
GTR	Primary Color Exterior, Opulent Blue Metallic (705u)	—	Reference
GTS	Primary Color Exterior, Luxo Blue Met (933l)	—	Reference
GTY	Rear axle, wide-track this code has more than one documented meaning — filter by year	2026	GM sourced
GTZ	Primary Color Exterior, Cobalt Red (946l)	—	Reference
GU1	Axle,rear,2.41 Ratio	—	Reference
GU2	P, RAX, M, AXLE REAR, 2.73 RATIO this code has more than one documented meaning — filter by year	1983	GM sourced
GU3	Axle,rear,2.93 Ratio	—	Reference
GU4	3.08 axle ratio	2020	GM sourced
GU5	Rear axle, 3.23 ratio	2026	GM sourced
GU6	Rear axle, 3.42 ratio	2026	GM sourced
GU7	P, RAX, M, AXLE REAR, 2.77 RATIO	1994	Provisional
GU8	P, RAX, M, AXLE REAR, 3.90 RATIO this code has more than one documented meaning — filter by year	1983	GM sourced
GU9	P, FAX, M, AXLE FRONT, 3.91 RATIO	1997	GM sourced
GUC	Primary Color Exterior, Bluebell Blue Met (727u)	—	Reference
GUD	Primary Color Exterior, Honey Mellow Yellow (726u)	—	Reference
GUE	Primary Color Exterior, Smokey Eye Grey Met (748u)	—	Reference
GUF	Primary Color Exterior, Mineral Oil Blue Met(749u)	—	Reference
GUJ	Primary Color Exterior, HS Green Cocktail Met (899s)	—	Reference
GUL	Primary Color Exterior, Shiny Silver (947t)	—	Reference
GUP	Primary Color Exterior, Lisbon Red (949t)	—	Reference
GUQ	Primary Color Exterior, Norway Blue (948t)	—	Reference
GUR	Primary Color Exterior, Galapagos Gray (945t)	—	Reference
GUS	Primary Color Exterior, Ebony Black (944t)	—	Reference
GUT	Primary Color Exterior, Sunset Gray (946t)	—	Reference
GV0	P, FAX, M, AXLE FRONT, 3.55 RATIO	1997	Provisional
GV1	AXLE REAR, 2.73 RATIO	—	Provisional
GV2	P, RAX, M, AXLE REAR, 5.83 RATIO this code has more than one documented meaning — filter by year	1984	GM sourced
GV3	P, RAT, M, RATIO, TRANSAXLE FINAL DRIVE 3.57 (USE OPTION FQ4)	1999	Provisional
GV4	P, RAX, M, AXLE REAR, 5.428 RATIO	1998	GM sourced
GV5	P, FAX, M, AXLE FRONT, 3.82 RATIO	1997	GM sourced
GV7	P, FAX, M, AXLE FRONT, 4.05 RATIO	1997	GM sourced
GV8	Axle,rear,2.72 Ratio	—	Reference
GV9	P, RAX, M, AXLE REAR, 4.25 RATIO	1992	Provisional
GVB	Primary Color Exterior, Lotus Green Metallic (768u)	—	Reference
GVC	Primary Color Exterior, Saturn Grey Metallic (766u)	—	Reference
GVD	Primary Color Exterior, Macaw Blue Metallic (765u)	—	Reference
GVF	Primary Color Exterior, Spectrus Grey Metallic (763u)	—	Reference
GVJ	Primary Color Exterior, Rusk Grey Metallic (767u)	—	Reference
GVK	Primary Color Exterior, Chili Red Pearlescent (769u)	—	Reference
GVL	Primary Color Exterior, Desert Beige Metallic (770u)	—	Reference
GVM	Primary Color Exterior, Pepper Red Solid (771u)	—	Reference
GVU	Primary Color Exterior, Mocha Bronze Met (518q)	—	Reference
GVW	Family Code, GVW Rating	1988	GM dated
GVX	Primary Color Exterior, Auburn Brown (956t)	—	Reference
GW1	P, RAX, M, AXLE REAR, 3.91 RATIO	1999	GM sourced
GW2	Sales Package 22, 000 GVW Sales	—	Reference
GW3	Sales Package 24, 000 GVW Sales	—	Reference
GW4	Sales Package 26, 000 GVW Sales	—	Reference
GW5	Ratio Transaxle Final Drive 3.16	—	Reference
GW6	P, RAX, M, AXLE REAR, 3.27 RATIO	1984	GM sourced
GW8	Axle,rear,2.92 Ratio	—	Reference
GW9	P, RAX, M, AXLE REAR, 2.93 RATIO (DUP WITH GU3) this code has more than one documented meaning — filter by year	1988	GM sourced
GWA	Primary Color Exterior, Seashell Met (160v)	—	Reference
GWD	Primary Color Exterior, Flip Chip Met (161v)	—	Reference
GWE	Primary Color Exterior, Noblesse Met (162v)	—	Reference
GWH	Primary Color Exterior, Phantom Grey Met (169v)	—	Reference
GWJ	Primary Color Exterior, Deep Sky Met (167v)	—	Reference
GWL	P, RSP, M, SPRING REAR, 9,000 LBS this code has more than one documented meaning — filter by year	1998	GM sourced
GWP	P, PLT, R, PLANT CODE, GLIWICE, POLAND	1996	GM sourced
GWR	Primary Color Exterior, Alchemy (deep Purple) (116v)	—	Reference
GWS	Primary Color Silver Topaz Metallic (101v)	—	Reference
GWT	Primary Color Champagne Silver Met (102v)	—	Reference
GWU	Primary Color Pinot Noir Met (103v)	—	Reference
GWV	Primary Color Golden Globe Met (104v)	—	Reference
GWX	Primary Color Subterranean Met (105v)	—	Reference
GWY	Primary Color Atlantis Met (106v)	—	Reference
GX1	P, RAX, M, AXLE REAR, 5.429 RATIO, 519 E, 8	—	GM sourced
GX2	AXLE REAR, 3.07 RATIO	—	Provisional
GX3	P, RAT, M, RATIO, TRANSAXLE FINAL DRIVE 3.33 this code has more than one documented meaning — filter by year	1983	GM sourced
GX4	Axle,rear,3.75 Ratio	—	Reference
GX5	Axle,rear,4.09 Ratio	—	Reference
GX6	P, RAX, M, AXLE REAR, 3.53 RATIO	1984	Provisional
GX8	P, RAT, M, RATIO, TRANSAXLE FINAL DRIVE 3.74 (USE OPTION FY2)	1997	Provisional
GXA	P, SSR, M, SUSPENSION REAR, 13,500 LB, TAPERED LEAF this code has more than one documented meaning — filter by year	1998	GM sourced
GXD	Sterling Gray Metallic	2026	GM sourced
GXG	Primary Color Iridium Met (121v)	—	Reference
GXH	Primary Color Berlin Blue Met (122v)	—	Reference
GXL	Package Cxl Option G	—	Reference
GXN	Primary Color Exterior, Bottle Green Met (715u)	—	Reference
GXP	Primary Color Exterior, Flame Orange Metallic (197v)	—	Reference
GXR	Primary Color Exterior, Mond Gray Metallic (194v)	—	Reference
GXT	Primary Color Exterior, Sand Gray Metallic (198v)	—	Reference
GXV	Primary Color Exterior, Perlado Black Pearl (730t)	—	Reference

Using the master list

This is the full GM RPO code list we hold — every Regular Production Option code in the database, searchable by code or by description and filterable to a single model year. Most RPO lists on the internet run to a couple of hundred codes copied from one service manual. This one holds 24,366, and tells you where each meaning came from.

What an RPO code is

RPO stands for Regular Production Option. Every piece of factory equipment on a GM vehicle carries a three-character code, and the ones fitted to your truck are printed on the Service Parts Identification label in the glove box or on the door jamb. G80 is a locking differential, Z71 is an off-road suspension package, K05 is a block heater.

They matter because they are what the factory actually built, not what a listing claims. If you are buying a truck, the label settles the argument. If you are ordering parts, the axle and transmission codes decide which part fits.

Why the same code means different things

GM has reused these codes for decades and across every division. A code that means one thing on a 1978 pickup can mean something unrelated on a 2015 SUV, and plenty of entries in circulation come from bulk listings with no year and no document behind them.

So every entry here is labelled with where it came from. GM sourced means we hold an actual GM document for it. GM dated means it comes from the option master with a date attached. Reference means it is in general circulation with nothing dated behind it — still useful, but treat it as a lead rather than a fact. Filtering by your model year is the single best way to get an answer you can rely on.

Read the codes off your own label

If you have the sticker in front of you, the RPO decoder will read a photo of it and decode every code at once, checked against your model year.

FullSizeChevy.com is not affiliated with, endorsed by, or sponsored by General Motors. Chevrolet, GMC, Cadillac, Silverado, Sierra and related marks are trademarks of General Motors LLC and are used here only to identify applicable vehicles. RPO meanings vary by model year, platform and configuration — verify against your own label before buying parts.