RPO code help

[Stitch]

I have some rpo's of the crew cab that I just acquired that I can't figure out...I'm going to list all of them and if anyone knows any, I'll match them to what I have come up with...I don't know if I have all these right or not...this is from research on about 30 different stupid sites...lol...can yall look it over and see what I have wrong and fill in the blanks...thanks fellas


AS3 - SEAT ASM,RR don't know what ASM stands for
A52 - SEAT ASM,FRT BENCH
B7P - BODY EQUIPMENT,PICKUP BOX PANELS(PRIME) Prime?
C6P - 8600 LB GVW
C91 - LAMP,DOME
D1V - GEAR, SPEEDO DRIVEN
D45 - MIRROR,O/S BELOW EYELINE(STNLS STL)
E2E -
E6D - COUNTRY GAZA wierd, but it's what came up in a search
E63 - BODY EQUIPMENT,FLEETSIDE PICKUP BOX
E8A - COVER, RR COMPT TONNEAU, RR COMPT - DELETE another wierd one, but it also came up in a search
GQ1 - REAR AXLE - STANDARD is this a 14 bolt
GT5 - AXLE,RR 4.10 RATIO
JB7 - BRAKE SYSTEM,VAC PWR DISC/DRUM
K19 - AIR INJECTION SYSTEM is this TBI?
K81 - GENERATOR,63 AMP
L0T -
MX1 - MERCHANDISING OPTION ONLY-DO NOT CATALOG what is this about?
M40 - TRANSMISSION,3-SPO AUTO (THM400)
NA4 - EMISSION SYSTEM,HEAVY DUTY
NA5 - EMISSION SYSTEM,FED REQUIREMENTS
NL2 - TANK,AUX FUEL(VAR 2)
N41 - STEERING,HYD(VARIABLE RATIO)
P10 - CARRIER,SPA TIRE
SLK -
STL -
UN9 - RADIO SUPPRESSION EQUIP
UP7 - RADIO,MONUARAL INSTL PROVISIONS MONUARAL INSTL?
U37 - LIGHTER,CIGARETTE
U69 - RADIO,AM/FM MONO PUSHBUTTON
U76 - ANTENNA,W/S EMBEDDED
V73 -
XYM - LT235/85R16E, R/PE, ST TL ALS BL FRONT what are the letters after the tire size for?
YD3 - FRONT AXLE, BASE EQUIPMENT FOR SCHEDULING, GVW PLATE also weird because the truck is 2wd no front axle
YD6 - REAR SPRING, BASE EQUIPMENT are these light duty or heavy duty springs?
YYN - LT235/85R16E, R/PE ST TL ALS BL REAR what are the letters after the tire size for?
ZN3 -
ZYN - LT235/85R16E, R/PE ST TL ALS BL SPARE what are the letters after the tire size for?
ZY1 - SOLID PAINT
Z53 - GAGE.VOLTMETER,OIL PRESS & TEMP
61U - PRIMARY COLOR, EXTERIOR, TAN
62I - INTERIOR TRIM, LT SADDLE
62V - TRIM COMBINATION, VINYL, LT SADDLE

[Keith Seymore]

I'll take a shot:

ASM = abbreviation for "assembly"
PRIME = don't know, but it appears that if it is an "unusual" feature then engineering had to tell them to prime/paint it (if that's the case then it apparently was also available "unprimed", and there would be a code for that to balance the release out
E6D = could be a country code for Gaza, or perhaps that's just a reference from a different time period from when yours was built. RPO codes do get reused so it could me one thing for a model year and something else for a different model year. For example, my book from 1998 does not show an E6D but it does show an E6E, which is a speedo adapter sleeve. Yours could be in that same family of RPOs.
E8A = same as above.
GQ1 = just means base (not optional) axle. Ring gear size depends on the model series of the truck.
MX1 = a merchandising option is one that functions as a "placeholder" until the specific "purchasable" option can be worked out. For example, you might see "MM4" as a merchandising option for a manual trans, and then the specific manual trans to follow (ie, M20, M62, M64 - particularly when the specific trans will vary based on other option content, as is the case with M62/M64 - same trans but different low gear ratios).
K19 - Air injection - is supplemental air shot into the exhaust for emissions purposes (like a California emissions package)
UP7 - radio, manaural - should mean "one speaker"
Letters after the tire typically designate load range, tire type (ie, all season, on/off road, sidewall type - black wall vs raised white letter or white wall) and other less interesting junk
YD3 - you dont' have a front axle? What's keeping the front bumper from dragging on the ground? (I'm kidding of course). That designates the weight capability of the front corners (springs, knuckles) etc which is considered the front axle, even though it is an independent front susp and not a beam type axle
YD6 - I'd say those are the base springs. There are separate RPOs (at least two of them) specifically designating HD springs.

You might also notice that "X" represents front tire, "Y" for rear tire and "Z" for spare, followed by the specific tire designation "YN".

K

[Stitch]

thanks alot Mr. Seymore...I knew you'd chime in with some useful information...

[Keith Seymore]

You are welcome (...although I'm still editing...).

I missed the blank ones, cause I was focused on your questions in italics.

The only ones I have are

L0T - looks like an engine RPO, but I don't recognize it
STL - should be "St Louis"
V73 - fixed mast radio antenna
ZN3 - chassis package, like for Grumman/Winnebago, etc

What model year and type of truck are we talking about here, anyway?

K

[78 Chevyrado]

Not to threadjack, but here goes. Hey keith, I have a 78 C20. It has an engine code of TDS on the build sheet and the Engine block (in front of the head). My RPO sticker says it's an LS9 - 350V8 4bbl. Do you have anything on these engine codes? I can't find that particular code anywhere. the closest I can find is a TSD on an 80-81 chevy van. there's just no TDS anywhere, for any vehicles.

[Keith Seymore]

The only link that I have does not show TDS:

http://www.nastyz28.com/gm-chevy-cod...s-suffix-6.php

and I did not keep any old literature from back then.

Recognize that the "TDS" number is an engine broadcast code, in support of RPO LS9. I tried to describe it like this in the previous thread:

Originally Posted by Keith Seymore

You can see there are several engines listed for RPO LS9, a 350 cu in V8 (what they show as the "VIN" column). Within that RPO you have to have different part numbers for Federal emissions, California emissions, manual trans, auto trans, maybe even A/C vs non A/C, or even different product lines (ie, a C/K engine might have a different part number than a G van engine).

Rather than have the operator scan through all the different part numbers, he is told to simply choose a TBC (rather than a TBD, TBE, etc).

Axles are another good example, because even though they might have the same RPO for the ratio (ie, GT4), they might still vary by C vs K (number of lugs), brake RPO and posi vs non. Various part numbers and subsequent broadcast codes would be assigned so the guy selecting the rear axle can quickly chose the correct one and hang it on the line.

Same thing for radiators (A/C vs non A/C, manual vs auto trans, HD vs LD vs standard duty, etc).

Incidently (this is really super picky), it appears to me the column that they show as "RPO" is really incorrectly labeled, and should be labeled either "Broadcast code" or "suffix code". I recognize the LS9, LG4 and L69 codes as engine RPOs that we used to work with. Other codes you might see might be LB4, L18, LE8, L03, LO5, etc, for example.

HTH -

K

[78 Chevyrado]

Thanks for the info!

[Stitch]

it's an 87 3/4 ton crew cab

I'll pm you the vin if it'll help...thanks again Keith...

[BLE 'BURBAN]

I'll run the vin at work tomorrow (friday) for ya And try to get a listing of your RPO codes with descriptions.

[BLE 'BURBAN]

No luck on running the v.i.n. for ya. Evidently the v.i.n. decoder only goes back to 1989 models. However somewheres around here at home I have a 1990 RPO codes Booklet That might help. I'll see if'n I can find it.

[Stitch]

crap...well, thanks for trying at least...I really appreciate it...I'm going to be rebuilding this truck, so it would be good to have as much info as I can on it...thanks again ble 'burban

[80SPORT]

Try your vin at compnine.com and see if your rpo s show up

[Stitch]

VIN not found...