05-05-2004, 11:47 PM
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#1
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Blazer drivin' mofo
Join Date: Nov 2003
Location: North Dakota
Age: 21
Posts: 1,465
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Rear End Ratio RPO Codes Here
GQ1 -- AXLE REAR, STD RATIO
GT4 -- AXLE REAR, 3.73 RATIO
GT5 -- AXLE REAR, 4.10 RATIO
GU4 -- AXLE REAR, 3.08 RATIO
GU5 -- AXLE REAR, 3.23 RATIO
GU6 -- AXLE REAR, 3.42 RATIO
G80 -- AXLE REAR, LIMITED SLIP (POSITRACTION)
HC4 -- AXLE REAR, 4.56 RATIO
I am finishing up a complete RPO code list that will soon be on my website, but I thought I would post these here for the time being.
Brendan
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05-06-2004, 05:40 AM
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#2
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Registered User
Join Date: Mar 2004
Location: Macungie, PA
Posts: 171
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Excellent! I have the 3.73, L/S. It would be nice to know what all those codes mean.
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05-06-2004, 01:47 PM
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#3
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AKA Hollywood
Join Date: Apr 2004
Location: Texas
Age: 35
Posts: 416
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Just Wondering.... 
Where Can you find these codes on the truck ?
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05-06-2004, 02:48 PM
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#4
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Trucknut
Join Date: Jun 2003
Location: Pleasanton, Texas
Age: 24
Posts: 932
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Open Your glovebox and look inside it. Should be a list of codes on the bottom.
__________________
2006 K1500 Vortec Max CCSB 6.0 4.10's, Nelson SD Tune, Trick Turbo kit T76 @ 8psi, 60lb/hr injectors, 4" duramax exhaust, snowmeth stage 2 kit, FLT Level 5 4L70E, Vig 2600, 40K trans cooler. 13.2 @ 100.5mph 1.8 60ft
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05-06-2004, 04:33 PM
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#5
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Blazer drivin' mofo
Join Date: Nov 2003
Location: North Dakota
Age: 21
Posts: 1,465
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Yeah, just look in the glovebox. It's just a little sticker with a list of 3 letter codes which are all of the options your truck came with.
Brendan
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05-07-2004, 10:12 AM
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#6
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Registered User
Join Date: Nov 2003
Location: MN
Posts: 1,408
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u can get it with a 4.56 ratio factory?
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1998 Chevy Silverado EXT Cab Red. 33x12.50x15 Dunlop Mud Rovers 4"-6" Rancho Lift and Dual Exhaust
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05-07-2004, 10:14 AM
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#7
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how uuu deewwwin
Join Date: Jul 2002
Location: Dallas, TX (Rowlett)
Age: 24
Posts: 6,144
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Quote:
Originally posted by SierraMan
u can get it with a 4.56 ratio factory?
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they came in alot of military issue stuff 
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6.0 Swap, Powerdyne supercharger, SFA, 44" boggers, some other stuff 
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05-07-2004, 05:32 PM
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#8
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Blazer drivin' mofo
Join Date: Nov 2003
Location: North Dakota
Age: 21
Posts: 1,465
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Yeah, they came in the military trucks
Brendan
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05-08-2004, 09:09 PM
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#9
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AKA Hollywood
Join Date: Apr 2004
Location: Texas
Age: 35
Posts: 416
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Quote:
Originally posted by Sambo
Open Your glovebox and look inside it. Should be a list of codes on the bottom.
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Thanks... 
Went and took a look in the glove box and found it.
G80.......from your list that would be the Limited Slip (posi)
does this have a gear ratio?.......
Hopefully this isnt a dumb Question... 
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05-09-2004, 01:36 AM
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#10
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Blazer drivin' mofo
Join Date: Nov 2003
Location: North Dakota
Age: 21
Posts: 1,465
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I'm not sure what gear ratio that would be. I'm guessing it could be 3.73? I'll do a little research in the morning and see what I can come up with.
Brendan
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05-09-2004, 07:41 AM
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#11
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Registered User
Join Date: May 2004
Location: NC
Age: 29
Posts: 21
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You should also have a code for a ratio. The G80 is just the limited slip, and has nothing to do with ratio. I think G80 is actually a locking diff, but i'm not sure
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05-09-2004, 06:33 PM
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#12
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how uuu deewwwin
Join Date: Jul 2002
Location: Dallas, TX (Rowlett)
Age: 24
Posts: 6,144
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Quote:
Originally posted by crh428
You should also have a code for a ratio. The G80 is just the limited slip, and has nothing to do with ratio. I think G80 is actually a locking diff, but i'm not sure
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that thing is crap  i hate my G80 it never locks when i want it to 
__________________
6.0 Swap, Powerdyne supercharger, SFA, 44" boggers, some other stuff
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05-09-2004, 10:33 PM
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#13
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Registered User
Join Date: May 2004
Location: Wichita Falls, Tx
Age: 30
Posts: 1
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That sux. Mine works great all the time.
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05-10-2004, 07:01 AM
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#14
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Registered User
Join Date: May 2004
Location: NC
Age: 29
Posts: 21
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Mine does too, and i checked, it is a posi, not a locker
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05-10-2004, 09:22 PM
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#15
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Registered User
Join Date: May 2004
Location: Napa
Age: 23
Posts: 2
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I can't seem to find the rear end code in my '01 tahoe. I see the big list of 3 digit codes in the glove box, but not one of them even start with a "G". Any help?
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05-11-2004, 05:39 AM
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#16
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Registered User
Join Date: May 2004
Location: NC
Age: 29
Posts: 21
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05-14-2004, 02:52 PM
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#17
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Registered User
Join Date: Feb 2004
Location: East Tennessee
Age: 63
Posts: 29
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GU6 G80
Wow. According to that, I have a 3.42 posi.
I'd sure like to stick that rear end under my Malibu and put the 3.73 from the 'bu in the truck.
Thanks, Brendan.
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05-15-2004, 02:32 AM
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#18
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Blazer drivin' mofo
Join Date: Nov 2003
Location: North Dakota
Age: 21
Posts: 1,465
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No prob, Bob. 
Brendan
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05-16-2004, 12:15 AM
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#19
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trucknut? can't find 'em
Join Date: Jan 2004
Location: new brunswick
Age: 31
Posts: 110
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do these codes work for an 86' truck?
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2000 FSC 4x4 4.8L stepside (SOLD)
1985 Jeep CJ-7 4x4 4.2L 33'' tires
g/f owns a tercel
1986 FSC 4x4 350 33'' tires
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05-16-2004, 09:03 PM
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#20
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Blazer drivin' mofo
Join Date: Nov 2003
Location: North Dakota
Age: 21
Posts: 1,465
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I'm not sure if these codes will work for an 86 or not. Anybody have any ideas?
Brendan
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