SPID Question

[TwoFiftyShifter]

The SPID located on the glove box door of my truck has a bunch of 3 digit codes on it.... but all the ones I see on this site list the options??? How to a decode this thing?

[Keith Seymore]

Can you post a pic?

I will confess that some of the SPID labels I see have additional characters and I don't know what they are for. They may not mean anything...

For example, mine has "9" before each entry:

9CD4 - Pulse Wipe
9E63 - Fleetside box
9GT4 - 3.73 rear axle
9G80 - Locking rear axle

etc. I recognize the three digit RPO code but not the "9". I have seen others that have an extra single digit and even multiple digits but, as I say, if you are somewhat familiar with the RPO codes then the extras may not be significant.


- OR - are you saying it has the codes but not the noun names, so you don't know what the codes mean?

Post a pic if you can.

K

[TwoFiftyShifter]

Kinda tore up, but the only one I can identify is the G80 locker.

[Keith Seymore]

Oh, ok -

I think there is an RPO decoder on site here (or on one of the linked sites) but I know a bunch of those off the top of my head:

A01 - Tinted windshield
A52 - Frt bench seat
B84 - body side molding
B96 - wheel opening moldings
C6P - 8600 lb GVW
D45 - Mirror stainless steel (buckeye type)

...can't read...

G51 - Heavy Duty springs rear

JAN - Janesville assy plant
MM4 - processing option, manual trans
M20 - 3 speed manual with granny low
NA4, NA5 - emissions packages

V01 - Heavy Duty radiator
V22 - uplevel grille

ZY1 - single color paint
Z53 - gages

I think that's the high points. Is there a specific one that I can't read that you are interested in?

K

[Keith Seymore]

Originally Posted by Keith Seymore

I will confess that some of the SPID labels I see have additional characters and I don't know what they are for. They may not mean anything...

For example, mine has "9" before each entry:

9CD4 - Pulse Wipe
9E63 - Fleetside box
9GT4 - 3.73 rear axle
9G80 - Locking rear axle

etc. I recognize the three digit RPO code but not the "9". I have seen others that have an extra single digit and even multiple digits but, as I say, if you are somewhat familiar with the RPO codes then the extras may not be significant.

So I guess all this was pretty much worthless, eh?

[TwoFiftyShifter]

Yeah, pretty much all of my codes are different. I found the decoder, but haven't read any cool codes yet... like the axle ratio.

[Keith Seymore]

I can't read it in your photo: what code are you showing for the axle ratio? If it's a GU6 then that's a 3.42:1.


Also: model number - CV20903:

C = Chevrolet
V = 4WD
209 = long wheel base 3/4 ton
03 = regular cab pickup

3/4 ton pickup with the M20 trans; sounds like a pretty serious truck! (lol)

The truck in question must be the '87 K20 in your signature....

[TwoFiftyShifter]

Thanks for the info, I did the thing where you marked the driveshaft and counted the turns and got about 3 and a half, I figured it was a 3.73, but by trying to maker out that code it looks like its GU6, so it must be a 3.42. Doesn't rev to the moon like a 4.10 truck does so that may be right.

[Slonaker]

I think this is what you need.

http://73-87.com/chevy_ids/rpomenu2.htm

Slonaker

EDIT: When I saw this I thought you were talking about South Padre Island Drive in Corpus Christi, Texas.

[Keith Seymore]

Originally Posted by TwoFiftyShifter

Thanks for the info, I did the thing where you marked the driveshaft and counted the turns and got about 3 and a half, I figured it was a 3.73, but by trying to maker out that code it looks like its GU6, so it must be a 3.42. Doesn't rev to the moon like a 4.10 truck does so that may be right.

Yes - GT4 = 3.73; GU6 = 3.42, so it should be pretty easy to tell them apart even on a damaged label.

Slonaker - thanks for the link. I'm still compiling "my favorites"...

K