Differential RPO codes deciferred!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gchemist · 02-16-2004, 12:49 AM

Finally a page that has some information.

TIMSPEED · 02-16-2004, 02:45 AM

But my truck doesn't give any information on the RPO sheet about any sort of gearing...

Grim Reaper · 02-16-2004, 11:25 AM

Quote:

Originally posted by TIMSPEED
But my truck doesn't give any information on the RPO sheet about any sort of gearing...

Then it's the base gear for the year. Most of the 70's and 80's the default gear was 3.08.

Nice site for axle info.

Prerunner1982 · 02-16-2004, 11:42 AM

they also dont have the GQ1 rpo code, which is the standard axle... i assume its 3.08.. still a good site though

Slonaker · 02-16-2004, 12:12 PM

My truck lists the gear ratio on the option sticker in the glove compartment. Most of the people with 80s trucks I have talked to have 2.73s.

Slonaker

ElGracho · 02-17-2004, 01:31 PM

Quote:

Originally posted by Prerunner1982
they also dont have the GQ1 rpo code, which is the standard axle... i assume its 3.08.. still a good site though

GQ1 Doesn't mean any specific ratio. It's true that it's the 'standard' ratio, but it depends on the year, the GVW of the truck (and there are more possibilities than just 1/2, 3/4 or 1 ton), the engine and the transmission.

For example the standard ratio for a 1984 1/2 ton 4x4 under 6500# GVW is 2.73 but a 1980 1/2 ton 2wd under 6500# is 3.08.

Prerunner1982 · 02-17-2004, 01:38 PM

ahhhhhhhhhhhhhhhhhhhhhhhhhhhhh user text holds true again.

ElGracho · 02-17-2004, 08:59 PM

Quote:

Originally posted by Prerunner1982
ahhhhhhhhhhhhhhhhhhhhhhhhhhhhh user text holds true again.

huh?

bigblock73 · 02-17-2004, 09:02 PM

Quote:

Originally posted by ElGracho

huh?

Joe, his user text says "village idiot"...that is what he is referring to. I am in the same village at times.

I give him an A for effort tho.

gchemist · 02-17-2004, 09:50 PM

The above codes would probably only be found on the build sheets.

TIMSPEED · 02-17-2004, 11:27 PM

Quote:

Originally posted by Grim Reaper
Then it's the base gear for the year. Most of the 70's and 80's the default gear was 3.08.

I GURANTEE I don't have 3.08's...shoot, I WISHED I did! They're either 3.73's or 4.10's...I think I'll spin the tire and see how many times the driveshaft spins...

apstguy · 02-17-2004, 11:57 PM

TIM - You wanna trade gears?

Destructo · 02-18-2004, 12:45 AM

My truck had the following options

1: 305 v8 engine
2: 4 spd automatic transmission
3: standard gear ratio (GQ1
4: 31x10.5" tires front, rear, and spare
5: locking differential (G80)

its an 1985 model shortbed 1/2 ton with a GVW of 6100 lbs, and it had 3.08 gears, talk about one retarded factory combo, OD couldn't even be used because it would only turn like 1600 rpm at 65mph.

02-16-2004, 12:49 AM	#1
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Differential RPO codes deciferred!!! Finally a page that has some information. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

02-16-2004, 02:45 AM	#2
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	But my truck doesn't give any information on the RPO sheet about any sort of gearing... __________________ I have a few cars... See Them Here

02-16-2004, 11:42 AM	#4
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,904	they also dont have the GQ1 rpo code, which is the standard axle... i assume its 3.08.. still a good site though __________________ Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call

02-16-2004, 12:12 PM	#5
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	My truck lists the gear ratio on the option sticker in the glove compartment. Most of the people with 80s trucks I have talked to have 2.73s. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

02-17-2004, 01:38 PM	#7
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,904	ahhhhhhhhhhhhhhhhhhhhhhhhhhhhh user text holds true again. __________________ Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call

02-17-2004, 09:50 PM	#10
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	The above codes would probably only be found on the build sheets. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

02-17-2004, 11:57 PM	#12
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	TIM - You wanna trade gears? __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

02-18-2004, 12:45 AM	#13
Destructo Registered User Join Date: Sep 2003 Location: Lewisville, NC Posts: 1,836	My truck had the following options 1: 305 v8 engine 2: 4 spd automatic transmission 3: standard gear ratio (GQ1 4: 31x10.5" tires front, rear, and spare 5: locking differential (G80) its an 1985 model shortbed 1/2 ton with a GVW of 6100 lbs, and it had 3.08 gears, talk about one retarded factory combo, OD couldn't even be used because it would only turn like 1600 rpm at 65mph. __________________ 1985 Scottsdale Shortbed 4x4 Stout 350 with some "upgrades"-700r4-33x12.5" Mud Tires, Warn 8274-50 winch. 2005 Chevrolet Colorado Regular Cab 2wd 4-banger, 5 speed, Street Pack with 3.73 axle.

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