RPO code decoding

[big_al273]

OK so i'm trying to decode my trucks RPO list and while i have most of it figured out thanks to the RPO listing on this post:

http://www.73-87chevytrucks.com/techinfo/7387CKMans//Unit_Repair/ST_333_87_1987_Chevrolet_Light_Duty_Truck_Unit_Repair_Manual.pdf

I still have a number of codes with no listing on this (above) posting, so im hoping that someone will know about my other codes and help me get a clear picture of how my truck rolled off the line.

My Truck is a 1988 Chevrolet V30 crew cab with a TBI BB 454, th400 3 speed auto, NP-205 transfer case (it was a U.S. fire dept Vehicle)

Here are my Codes and what I've found them too mean, please let me know if any are wrong or if you know what the unknown codes are please let me know.

AS3 - seat, right rear, suburban (does anyone else have this code in a crew cab?)
A52 - seat, front bench
BS4 - ?
BY1 - ?
B85 - Extra molding, Belt reveal
B96 - Extra Molding, Wheel opening
CD4 - Wiper system, pulse
C6W - ?
C60 - Air conditioning, front manual controls
C91 - Lamp, interior courtesy
D1Z - ?
D44 - Mirror, outside painted
E5Z - ?
E6J - ?
E63 - Pickup box, fleetside
E9Z - ?
FLT - ?
GT5 - Rear axle, 4.10 ratio
G80 - axle, rear, limited slip
JAN - ?
JB8 - ?
KC4 - Engine, Oil cooler system
K19 - Air injection reactor system
K22 - Generator, 94 amp
L19 - Engine, 7.4L V8 TBI
MX1 - ?
M40 - Transmission, Auto, 3 speed, Torque Conv. Var. 1
NA5 - Emission system, federal requirements
NL2 - Fuel tank, auxiliary
NY7 - Transfer case, shield (skid plate)
R04 - ?
TP2 - Battery, auxiliary camper
UA1 - Battery, high capacity
UM7 - Radio, AM/FM, Seek/Scan, Clock ETR
UN9 - ?
UP8 - ?
U73 - Fixed Mast antenna
VQ1 - ?
V02 - Radiator, Heavy duty w/trans. oil cooler
V73 - ?
V76 - front hook towing device
WAM - ?
XYN - ?
YD3 - ?
YD6 - ?
YG3 - ?
YK6 - ?
YYN - ?
ZN3 - ?
ZY5 - ?
12L - ?
6F6 - ?
72U - ?
73A - ?
77I - ?
77W - ?

[AZ87V10]

BS4: Insulation, back panel of cab
BY1: Ornamentation, exterior emblems, body, variety 3
C6W: GVWR rating
D1Z: Most likely the speedometer driven gear type
E5Z: Speedometer adapter (delete)
E9Z: Speedometer key (delete)
JAN: Plant code, Janesville Wisconsin
JB8: Should be your brake type and weight range
MX1: Merchandising package for transmission
UN9: Radio, suppression equipment
UP8: Stereo radio installation provisions, instrumentation
YD3: Front axle, base equipment for scheduling, GVW plate
YD6: Rear spring, base equipment
YG3: Ornamentation, body side, and wheel opening; bright
ZY5: Color combination, exterior décor
12L: Secondary exterior body color; Frost White
72U: Primary exterior color
73A: Should be accent stripe color
77I: Should be interior trim color
77W: Interior trim combination

Hope this helps. It's not complete, but these are all either the same codes my truck has or similar to what's on mine. I got my codes from several different sources online. Keep searching and hopefully you can turn something up. You can also take your VIN number to your local GM dealer and have them decode it for you. GM used similar codes for items for a very long time. Good luck.

[big_al273]

Update: found another source for GM RPO codes and now have almost all of my codes figured out, i still have a few to find and would appreciate any additional sources or info.

GM RPO codes : http://www.rpocodes.com/GM-RPO-codes/gmrpocodes0through4.html

AS3 - seat, right rear, suburban
A52 - seat, front bench
BS4 - INSULATION, BACK PNL
BY1 -  ORNAMENTATION, EXTR EMBLEM, BODY, VAR 3
B85 - Extra molding, Belt reveal
B96 - Extra Molding, Wheel opening
CD4 - Wiper system, pulse
C6W -  GVW RATING, 9200 LBS
C60 - Air conditioning, front manual controls
C91 - Lamp, interior courtesy
D1Z - GEAR, SPEEDO DRIVEN (D1Z)
D44 - Mirror, outside painted
E5Z - SPEEDOMETER ADAPTER (DELETE)
E6J - ?
E63 - Pickup box, fleetside
E9Z - SPEEDOMETER KEY (DELETE)
FLT - ?
GT5 - Rear axle, 4.10 ratio
G80 - axle, rear, limited slip
JAN - ?
JB8 - BRAKE, POWER, DISC, DRUM 10000 LB
KC4 - Engine, Oil cooler system
K19 - Air injection reactor system
K22 - Generator, 94 amp
L19 - Engine, 7.4L V8 TBI
MX1 - MERCHANDISED, TRANS, AUTO PROVISIONS
M40 - Transmission, Auto, 3 speed, Torque Conv. Var. 1
NA5 - Emission system, federal requirements
NL2 - Fuel tank, auxiliary
NY7 - Transfer case, shield (skid plate)
R04 - WHEEL SINGLE RR
TP2 - Battery, auxiliary camper
UA1 - Battery, high capacity
UM7 - Radio, AM/FM, Seek/Scan, Clock ETR
UN9 - RADIO, SUPPRESSION EQUIPMENT
UP8 - STEREO RADIO INSTALLMENT PROVISIONS
U73 - Fixed Mast antenna
VQ1 - ?
V02 - Radiator, Heavy duty w/trans. oil cooler
V73 - VEHICLE STATEMENT, USA/CANADA
V76 - front hook towing device
WAM - ?
XYN - LT235/85R16E, R/PE, ST TL ALS BL FRONT
YD3 - FRONT AXLE, BASE EQUIPMENT FOR SCHEDULING, GVW PLATE
YD6 - REAR SPRING, BASE EQUIPMENT
YG3 - ORNAMENTATION, BODY, SIDE, 6 WHL OPENING BRIGHT
YK6 - ?
YYN - LT235/85R16E, R/PE ST TL ALS BL REAR
ZN3 - ?
ZY5 - COLOR COMBINATION, EXTERIOR DECOR
12L - SECONDARY COLOR, EXTERIOR, SILVER MET (91)
6F6 - ?
72U - PRIMARY COLOR, EXTERIOR, MED GARNET RED MET (91)
73A - STRIPE COLOR, ACCENT, TWO TONE, VERMILLION/CARMINE
77I - INTERIOR TRIM, DK MAPLE (I)
77W - TRIM COMBINATION, DK MAPLE (W)

[Greybeard]

Yup, I found this site> http://www.angelfire.com/ny2/96transam/rpocodes.html

[hatzie]

YK6 is a Special Equipment Option... (COPO)

Try your VIN at Compnine.com they may have it in their database.

[big_al273]

Thanks for the input guys, Compnine.com did not have my VIN on file. What would be considered special equipment? what special equipment options were available on our trucks?

[Greybeard]

Not really sure. Maybe things like the camper special, certain uncommon and/or regional trim or suspension packages, etc. You know other company's like Dodge and Jeep had special suspension and trim packages. Dodge had the Little Red Wagon, Jeep had many regional and national favorites. Renegade, Sahara, etc. Not entirely unique since they were production vehicles but sometimes the numbers sold were so small ... Back in those days a vehicle could be built to order also.