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Username Post: Where can I find RPO codes, other info, for 99 G3500?        (Topic#229109)
Bill K.b 
Senior Member
Posts: 4275

Loc: upstate NY
Reg: 10-24-05
11-05-09 07:32 PM - Post#1800415    

I ended up buying a '99 GMC G3500 van mini-bus conversion. Anyone know how I can find codes to determine rear gear ratio, if it's a locker, etc. ?

Both doors are screwed up, the windows don't roll up right. Is this common, or should I be able to fix it with junkyard parts? Can I install power windows? Are they any better than the hand cranks?

Every one of the ones I looked at showed leakage around the hydroboost unit. Mine is really minor. Anyone know what might cause it or what's involved to fix it? Seems to leak out from between booster and master cylinder. Because of the antilock brakes I'm thinking I might wait for a catastrophic failure of the seal or booster before I mess with it, I'm sure I'd have to at the least pay to have them bled after I was done.

I see no one knows what this taillight converter deal is on the trailer add-on wire harness or why I would need one, versus just a straight plug-in. I notice the running lights are seperate from the brake/tail lights, maybe this has something to do with it?
Those who can, do. Those who can't, criticize it on the internet.

1988 G20 van 5.7L - driver.
1993 3500 dually 5.7L NV4500 - tow truck
1991 G20 van - parts truck

Plus cars for swap and sale
&yes, I once tried a frame swap on a 51 Chevy.


 
LMC Trucks
Bill K.b 
Senior Member
Posts: 4275

Loc: upstate NY
Reg: 10-24-05
11-05-09 09:15 PM - Post#1800462    
    In response to Bill K.b

update: Found the RPO sticker on the right side door, next to the latch mechanism. Of course it's been hit with thinner or lube or something and is faded and kind of smeared, but some of the codes are readable.

Any idea if I can run the VIN through a GM parts dealer and come up with a replacement sticker or something?




So this info will turn up in other people's Google Searches: GMC Savana 3500 Van RPO Code Location Chevy Express 2500 G3500 G2500 1998 1999 2000 2001 1997
Those who can, do. Those who can't, criticize it on the internet.

1988 G20 van 5.7L - driver.
1993 3500 dually 5.7L NV4500 - tow truck
1991 G20 van - parts truck

Plus cars for swap and sale
&yes, I once tried a frame swap on a 51 Chevy.


 
elcamino 
Valued Contributor
Posts: 4991
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
11-06-09 12:23 PM - Post#1800744    
    In response to Bill K.b

If you can make them out, the codes that start with G refer to the rear axle.

G80 = Locker

If you bring the VIN into a dealer parts dept they might run a build out for you. Keep in mind its not something they may be willing to do as that is a feature for them to use to match up parts and not for giving out to customers. Its also possible the system will not go back that far.


Mike
2009 Cadillac CTS4 AWD Performance Sedan
2012 GMC Sierra AWD Denali 6.2L


 
Bill K.b 
Senior Member
Posts: 4275

Loc: upstate NY
Reg: 10-24-05
11-06-09 02:11 PM - Post#1800805    
    In response to elcamino

I was able to determine locker, 10,000 lb brakes, equipped originally with only one seat, and a couple of the ones I can read I didn't find online anywhere. Thanks.
Those who can, do. Those who can't, criticize it on the internet.

1988 G20 van 5.7L - driver.
1993 3500 dually 5.7L NV4500 - tow truck
1991 G20 van - parts truck

Plus cars for swap and sale
&yes, I once tried a frame swap on a 51 Chevy.


 
elcamino 
Valued Contributor
Posts: 4991
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
11-07-09 07:15 AM - Post#1801166    
    In response to Bill K.b

Note

Many codes on the door label don't decode to any option. They just refer to parts components such as springs of specific rates etc.


Btw-You cannot get a replacement rpo sticker. Those were generated by the assembly plant system. I looked at a slightly used new car a few year back where the label messed like this one and they tried and tried but could get a new label and it was still the current model year.
Mike
2009 Cadillac CTS4 AWD Performance Sedan
2012 GMC Sierra AWD Denali 6.2L


 
Bill K.b 
Senior Member
Posts: 4275

Loc: upstate NY
Reg: 10-24-05
12-16-09 09:41 PM - Post#1825441    
    In response to elcamino

Just to update this, I had a dealer make a key for me and I mentioned the RPO issue and he printed me up the buildout, no problem, no charge. Turns out it had a 4.10 gear in it. But I ended up selling the van - the local toll road classes vehicles over 7 foot 6 inches tall a higher toll - and this van is 7 foot 10 inches tall, give or take half an inch. I also discovered that the door mechanisms are problematic, they suffer from the leaky intake issue, and replacement parts tend to be expensive.


Meanwhile, I tore into a power window equipped van. There is a seperate harness section for the PW/PL. It plugs into a white connector next to the brake pedal bracket - whether or not you'll have hot power to the windows on a van not built that way, who knows. What a pain to remove it - I had to pull several pieces off an already stripped dash, then pull the brake pedal bracket out and loosen the E-brake pedal bracket. And door removal.. apparently you have to drive the pins out, no bolts on either side of the hinges.

But I also found out the PW motors interchange with several models of Buick cars, of all things. So it may be possible to cob up power windows if someone wanted - it's a good deal easier to find the various Buick models than a PW van, the ones hitting the junkyard run about 30 to 1 worn out work vans to passenger vans.


Those who can, do. Those who can't, criticize it on the internet.

1988 G20 van 5.7L - driver.
1993 3500 dually 5.7L NV4500 - tow truck
1991 G20 van - parts truck

Plus cars for swap and sale
&yes, I once tried a frame swap on a 51 Chevy.


 
rodram 
Contributor
Posts: 379

Loc: Saskatoon, CANADA
Reg: 04-14-09
12-17-09 10:39 AM - Post#1825683    
    In response to Bill K.b

... or to find the RPO codes you could try this website
... enter your VIN and it will tell you your RPO codes and production numbers with various combination of options

... I've heard that for the newer trucks (last few years ) there may be inaccuracies in some details like production date, etc, but in general it has pretty good information

http://www.compnine.com/vid.php


Edited by rodram on 12-17-09 10:44 AM. Reason for edit: No reason given.

 
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