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Thread: RPO codes GT5 and G80
08-01-2010, 06:10 PM #1
RPO codes GT5 and G80
I've been asking many gear questions as some of you may know, wondering if 4.56's were the way to go. Today I finally took the time to read my RPO codes in the glove box and came up with these two: GT5= 4.10 ratio and G80= axle positraction, limited slip. I just saved myself A LOT of money. I assumed from reading through the forum that most Silverados, even the 2500HD, came stock with 3.73s but I had a feeling the truck came with posi because of the burnout marks. Also, I never really noticed the sluggish feeling in the truck that some people felt after putting on bigger tires so I wasn't sure if I was oblivious or had different gears. So make sure you check out the RPO codes before you buy anything. No reason to make a few thousand dollar mistake.2003 Silverado 2500HD 6.0L Vortec V8
2" Body Lift
3" Suspension Lift
Skyjacker Hydro 7000 Shocks
Skyjacker Steering Stabilizer
35" Tires with 20" American Racing Rims
Velocity Cold Air Intake
Billet Throttle Body Spacer
BBK Performance Headers
MBRP Cat-Back Exhaust System
DiabloSport Predator- Soon to be tuned by Diablew
"Soon to be leveling-kit"
08-02-2010, 08:25 AM #2
Well somebody wanted to be able to tow with your truck.. Glad it came with the 4.11s, your powertrain will be happy for a alot longer with those gears..Mike
1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).
2009 Saturn Aura XE (wifes car)
2011 F-150 Crew 4X4
"Hold it to the floor till you see God.... Then Brake!!!!"
08-02-2010, 09:23 AM #3
Are the 2500HD's known for coming with 4.10s and/or posi? Just doesn't seem like the norm going by what some of the other members say.
08-02-2010, 09:28 AM #4
Well the G80 is fairly common when you get a 4X4... However the 4.10s arent because most people want the balance of fuel economy and towing power that 3.73s provide.. However (im not sure if you bought your truck new or used) but there are people who wanted just straight up pulling power especially before gas hit $5 a gallon 2 years ago. So the would opt for the 4.11s..
08-02-2010, 12:27 PM #5
I bought the truck used about 2 years ago, so the previous owner must have asked for that option.
08-02-2010, 12:39 PM #6
Seems like it.. Good thing for you saves you a few bucks.
08-02-2010, 12:48 PM #7
Definitely a good thing and I'm glad I took the time to read the RPO. 4.10 to 4.56 difference wouldn't have been worth the $1500 cost.
08-02-2010, 04:05 PM #8
the g80 is a locking rear not L.S. (like rpo code saids)
anyway did you look up your vin num
IT will tell how many came with 410 gears
Last edited by wayned; 08-02-2010 at 04:39 PM.
08-02-2010, 08:12 PM #9
GM needs to better clarify their RPO codes, happy with the positraction though. I'm just glad it came with 4.10's so I can spend that money on a custom tune, true-duals and leveling kit rather than upgrading to 4.56's.
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