Hm... I wrote this a few years back on CF... well, guess what. I still own it. Even if they DID modify my location from something obscene.

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It happens all the time... people want to know how to break down the Regular Production Order (RPO) codes on their new C4!

Let's create our own list, and not send members to other forums!

To find your RPO code, check under the center console, or the left rear storage bin.

Confirm that the VIN number matches your car! It's quite common for a new center console to be installed without consideration for the RPO sticker!

If you want a build sheet, contact the Nation Corvette Museum at http://www.corvettemuseum.com/.

Some of these RPO's, I am sure came from The Corvette Black Book (various years) by Michael Antonick.

Some of these RPOs are independant of themselves. For example, one RPO indicates that the manual transmission was selected, where another indicates WHICH manual, even though only one was available... which must be some kind of leftover from when there were 3 different manual transmissions (back in the 60s, there was the 3 speed and two different 4 speeds).

First off, though, what is an RPO? It is the Regular Production Order code. These codes were assigned by GM to keep track of options and activities during the manufacturing of a car. These numbers are not reflective of anything other than what code was available at the time it was assigned. However, some codes have taken on meanings unto themselves, such as the Z28 Camaro, or the ZR1 Corvette. The "Z28" and "ZR1" are both the RPO codes assigned to that option package.

Same thing goes for the old W30 Cutlasses and WS6 Firebirds of the day. At times, GM will establish an RPO that stays within a specific option group. For example, the LT1 option has been reused, as has LS6. They both harken back to a bygone era and sound cool. In short, they are instantly recognised as being performance options.

The list:

1YY07 - Base Coupe
1YY67 - Base Convertible

1AZ - Modification stock order or order sold
1SB - Marketed option package 2
24S - "Removable Roof Panel, blue tint"
64S - "Removable Roof Panel, bronze tint"
AC1 - Power Passenger Seat
AC3 - Power Driver Seat
AJ3 - S.I.R. system (driver side only) 90-93
AK5 - Front seat S.I.R. system (driver & pass.) 94-96
AQ9 - Leather Sport Seats
AR9 - Base Leather Seats
AU3 - Power Door Lock System
B2K - Callaway Twin Turbo Engine (on Bowling Green Twin Turbos)
B4P - Fan, Aux Cooling, Electric
BGR - Bowling Green assembly plant
C05 - convertible folding top
C2L - Dual Removable Roof Panels
C49 - Electronic Rear Window Defogger
C60 - Manual Air Conditioning Controls
C68 - Electronic Climate Control
CC2 - Auxiliary Hardtop (convertible only)
CC3 - Removable Plastic Roof Panel
CF7 - Removable Roof Panel (Solid Body Color)
D3X - Speedometer Driven Gear (25513049)
D4L - Speedometer Driven Gear (25513050)
D7B - Speedometer Driven Gear (25513043)
D7C - Speedometer Driven Gear (25513045)
D8E - Vehicle Speed Sensor (10456021)
D8F - Vehicle Speed Sensor (10456022)
D8H - Vehicle Speed Sensor (10456039)
DC7 - Electronic LH & RH Outside Mirrors
DC8 - Electronic LH & RH Outside Mirrors
DL5 - roadside service information decal
DL8 - LH/RH Heated Sport Mirrors
E5C - Delete speedometer adaptor
E9Z - Delete speedometer key
EXP - Export
F45 - Adjustable Suspension
FE1 - Base suspension
FE3 - sport suspension (96 Z51)
FE7 - Heavy Duty Suspension
FE9 - federal emissions
FX3 - Adjustable Suspension
G44 - 3.07 Rear Axle Ratio
G87 - ring gear 8.50 inch
G92 - Performance Axle Ratio
GHO - 3.54 axle ratio
GM1 - 2.59 Rear Axle Ratio
GM3 - 3.45 Rear Axle Ratio (8.5 in. Ring Gear)
GT7 - 3.33 rear axle ratio
GU2 - 2.73 Rear Axle Ratio
IP3 - Interior trim design P3
J55 - Heavy Duty Brakes
JL9 - Antilock Front and Rear Disc Brakes
K05 - Engine Block Heater (Canada Export only)
KC4 - oil cooler
KG9 - 140 amp generator
KW2 - 124-Amp Generator
L83 - 1984, standard engine, Crossfire, 350ci, 205 hp.
L98 - 1985-1991, standard engine, 350ci, 230~250hp.
LT1 - 1992-1996, standard engine, 350ci, 300 hp.
LT4 - 1996, optional engine, available only with manual transmission, 330hp
LT5 - 1990-1995, optional engine, part of ZR1 package, 375hp, in 1993, upped to 405hp.
MD8 - 4-Spd. 4L60 Automatic Transmission
ML9 - manual 6-speed, ZF-transmission
MN6 - 6-speed manual transmission
MX0 - automatic transmission
NA5 - Federal Emission systems
NK4 - Sport Leather Steering Wheel
NN5 - California Emission Requirements
QA1 - Wheel, 17 x 9.5, Aluminum
QA2 - Wheels, 17 x 9.5 (Front) 17 x 11 (Rear), Aluminum
QB6 - aluminum wheels 17 x 8.5" front, 17 x 9.5" rear
R9Z - Control sales item 100
T61 - Daytime Running Lights
U19 - Miles & Kilometers Dash Cluster
U1F - Delco Bose Stereo System w/ CD
U52 - Electronic Instrument Cluster
U75 - Power Antenna
UJ6 - Low Tire Pressure Warning System
UM6 - "Bose Stereo w/ CD & Cassette, Seek/Scan, Clock, ETR Radio"
UU8 - Delco Bose Stereo System
UXO - Dual Floor Sill & Extended Range Speaker System
VM3 - information label, bumper impact standards
V56 - Luggage Rack (convertible only)
V73 - Vehicle statement, US or Canada
XAA - front tire P255/45 ZR17
XAU - Front Tire, P275/40ZR17
YAA - rear tire P285/40 ZR17
YAU - Rear Tire, P275/40ZR17
YBE - Rear Tire, P315/35ZR17
Z07 - Handling suspension
Z51 - Handling suspension
Z52 - Handling suspension
Z5G - Identification, Callaway Orders (not listed on SPI label all years)
ZR1 - Special Performance Pkg.

Colour codes:

Exterior

10U - Arctic White exterior

Interior

70I - Torch Red interior
703 - Torch Red leather

Rear Differentials:

This topic gets picked on quite frequently. Time to clarify it. There are two differentials, the D44 and the D36 (not RPO codes), both made by Dana. The D36 is standard on the automatic and the D44 is standard on the manual, expection being 1984, when the D36 was the only one available.

These are the codes related to the rear gearing, with the differential that they use:

G44 - 3.07 Rear Axle Ratio - D36, optional; D44, standard, pre-1992.
G92 - Performance Axle Ratio - Shows performance axle selected.
GHO - 3.54 axle ratio - D44 only.
GM1 - 2.59 Rear Axle Ratio - D36 only.
GM3 - 3.45 Rear Axle Ratio - D44 only.
GU2 - 2.73 Rear Axle Ratio - D36 only.

What this means is this, G92 is not dependant on a specific ratio or differential housing. It's just an indicator, a rather redundant one when you think about it.

There is a D44 offered with a 3.33 or 3.31, don't have that RPO yet.

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Thanks for providing RPO's!!!

- *89x2*
- 90EXPVette
- jd v3tt3
- ODA CDR
- Strike3
- vms4evr
- Z07 freak

** These are former and potentially current CF members, they are not on The Guru from my understanding. **
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Ok, let's start filling in these blanks! As you all add them, I will post them in this document, then yours can be deleted, to keep the thread smaller.

Same goes for errors and such! This thread does not need to get to 1000 posts.

There is a site where you can input your VIN and get the RPO list. I have it at work. I'll post it tomorrow.

I have seen it. Once it displays the few it can deduce from the VIN, it then lists all options for that year. In short, it lacks a full database.

Now for an 84, will I find this under the center console? Just curious, so bear with me I am learning!

Quote:

Yes. Lift the lid, it's underneath. Unless someone removed it or replaced the lid. Then you're SOL.

Hate to be the bearer of news... in 1984, they put the decal under the left rear storage bin lid.

Quote:

Oops, sorry about that!

My car did not have the sticker

Compnine.com was the site that I mentioned earlier Andy. It gave me the complete list of my car. Maybe I was one of the lucky ones. Found out that I have a 3.07 rear.