found a special edition silverado - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bucannon · 12-26-2010, 03:18 PM

i found a specil edition silverado in a junkyard. i took a picture of the glove box codes can yall tell me what rear end ratio it has and what motor and trans and anything else about it.

thanks yall

lha1992 · 12-26-2010, 03:36 PM

All it has is a L03 305 V8 motor and a G80 rear axle.

GmtGmt · 12-26-2010, 04:30 PM

and its a 1987 CHEVROLET R10

b454rat · 12-26-2010, 04:58 PM

3.08s I think, have to look at the RPO list again.

**bigunde** · 12-26-2010, 06:23 PM

Its a 2:73 Posi rear.

GU2 2.73 Rear
GU4 3.08 Rear
GU5 3.23 Rear
GU6 3.42 Rear
GT4 3.73 Rear
GT5 4.10 Rear
HC4 4.56 Rear

bucannon · 12-26-2010, 09:39 PM

what says that its a posi?

zimmstoy · 12-26-2010, 10:16 PM

Quote:

Originally Posted by bucannon

what says that its a posi?

code G80

knightowl73 · 12-26-2010, 10:26 PM

i dont think that rear would be useful for anything but a lowrider truck on 13's or 14's lol. 2.73 with a posi? i woulda needed that back in my high school days with my 79 blazer with hyrdraulics on 14" whitewalls and spokes. woulda helped alot in the rain, otherwise tho, dont think that rear is anything special

AuggieStyle · 12-26-2010, 10:31 PM

g80 rpo is posi limited slip
lo3 is 305 tbi
gq1 std axle ratio
gu2 2.73 ratio rear axle
k81 66amp generator
md8 transmission thm 4 speed 700r4
n31 steering wheel custom
n67 wheel rally type
u69 am/fm radio
u76 winshied antenna
v43 rear painted bumper w step
z53 intr cluster oil,temp,volts,cool
18d trim combination dark charchoal (D)
18i interior trim dark charchaol
19l exterior secondary color lamp black
72u primary exterior color med garnet red
77a exterior accent stripe victory red

benoit454 · 12-27-2010, 01:42 AM

g80 is gov loc not posi. At least that's what I've been told and more true on the nwer trucks.

1BadSS · 12-27-2010, 01:46 AM

Quote:

Originally Posted by benoit454

g80 is gov loc not posi. At least that's what I've been told and more true on the nwer trucks.

G80 is GM's Limited slip differential.

benoit454 · 12-27-2010, 12:21 PM

I thought g90 was "locking differential" that's what our 84 said anyways.

I don't know if the old style clutch posi's had the same code or not but those were the way better ones anyways. I don't even consider a gov loc a posi, they suck.

erikgto · 12-27-2010, 07:27 PM

With a 305 700R4 and 2.73 rear what rpm was this thing lugging on at 65-70 mph?!? 1.600 or so???

Wouldn't that be lugging the 305 like crazy?
Think 3.08 to 3.42 would be much better for that engine thus better mileage or am I missing something?

erik

87 V20 Scottsdale · 12-27-2010, 08:06 PM

Quote:

Originally Posted by erikgto

With a 305 700R4 and 2.73 rear what rpm was this thing lugging on at 65-70 mph?!? 1.600 or so???

Wouldn't that be lugging the 305 like crazy?
Think 3.08 to 3.42 would be much better for that engine thus better mileage or am I missing something?

erik

Unbelieveably crazy... My '88 can barely handle running OD with 3.08 rears, however sometimes I get lucky and get some good mpg numbers. I hit 20 mpg once, most of the time is 15-17.

68Timber · 12-27-2010, 10:19 PM

Quote:

Originally Posted by 1BadSS

G80 is GM's Limited slip differential.

G80 on a truck = Gov Loc, not a limited slip, a factory locker. They're OK for a commuter and normal (read "light duty") use, but they won't take abuse.

bucannon · 12-28-2010, 02:50 AM

well my truck already has 2.73 ratio open 10 bolt so i might just swap in the posi rear end and buy a gear set

bucannon · 12-28-2010, 02:51 AM

and the door panels and some dash parts

sailed2japan · 12-28-2010, 11:12 PM

SO how about some pics of the outside of this special beast?

12-26-2010, 03:18 PM	#1
bucannon Salty Sailor Join Date: May 2009 Location: Savannah, Ga Posts: 603	found a special edition silverado i found a specil edition silverado in a junkyard. i took a picture of the glove box codes can yall tell me what rear end ratio it has and what motor and trans and anything else about it. thanks yall __________________ 86 c-10 Custom Deluxe Savannah, Georgia

12-26-2010, 03:36 PM	#2
lha1992 Registered User Join Date: Apr 2010 Location: Everett, WA Posts: 504	Re: found a special edition silverado All it has is a L03 305 V8 motor and a G80 rear axle.

12-26-2010, 04:58 PM	#4
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	Re: found a special edition silverado 3.08s I think, have to look at the RPO list again. __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS

12-26-2010, 06:23 PM	#5
bigunde Rusty Rockerfeller Join Date: May 2003 Location: South Georgia Posts: 1,631	Re: found a special edition silverado Its a 2:73 Posi rear. GU2 2.73 Rear GU4 3.08 Rear GU5 3.23 Rear GU6 3.42 Rear GT4 3.73 Rear GT5 4.10 Rear HC4 4.56 Rear

12-26-2010, 09:39 PM	#6
bucannon Salty Sailor Join Date: May 2009 Location: Savannah, Ga Posts: 603	Re: found a special edition silverado what says that its a posi? __________________ 86 c-10 Custom Deluxe Savannah, Georgia

12-26-2010, 10:26 PM	#8
knightowl73 TUKE-NoBullChit Customs owner Join Date: Feb 2010 Location: La Marque, Tx Posts: 640	Re: found a special edition silverado i dont think that rear would be useful for anything but a lowrider truck on 13's or 14's lol. 2.73 with a posi? i woulda needed that back in my high school days with my 79 blazer with hyrdraulics on 14" whitewalls and spokes. woulda helped alot in the rain, otherwise tho, dont think that rear is anything special __________________ OWNER @ NBC Customs...No Bull Chit....'92 GMC C2500 ECSB 350/TH400, '57 FORD SKYLINER (My dad's for now, but its really mine-you'll NEVER see a cooler car at 7 years old lol), '42 ford rat rod shop truck (new project), 91 CHRYSLER VOYER MINIVAN (shop van for now) http://www.facebook.com/#!/nbc.customs

12-26-2010, 10:31 PM	#9
AuggieStyle Registered User Join Date: Apr 2007 Location: Dallas,TX. Posts: 499	Re: found a special edition silverado g80 rpo is posi limited slip lo3 is 305 tbi gq1 std axle ratio gu2 2.73 ratio rear axle k81 66amp generator md8 transmission thm 4 speed 700r4 n31 steering wheel custom n67 wheel rally type u69 am/fm radio u76 winshied antenna v43 rear painted bumper w step z53 intr cluster oil,temp,volts,cool 18d trim combination dark charchoal (D) 18i interior trim dark charchaol 19l exterior secondary color lamp black 72u primary exterior color med garnet red 77a exterior accent stripe victory red

12-27-2010, 01:42 AM	#10
benoit454 Chris Join Date: Nov 2004 Location: Monaville, WV Posts: 3,737	Re: found a special edition silverado g80 is gov loc not posi. At least that's what I've been told and more true on the nwer trucks. __________________ Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454

12-27-2010, 12:21 PM	#12
benoit454 Chris Join Date: Nov 2004 Location: Monaville, WV Posts: 3,737	Re: found a special edition silverado I thought g90 was "locking differential" that's what our 84 said anyways. I don't know if the old style clutch posi's had the same code or not but those were the way better ones anyways. I don't even consider a gov loc a posi, they suck. __________________ Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454

12-27-2010, 07:27 PM	#13
erikgto Registered User Join Date: May 2007 Location: The Netherlands Posts: 185	Re: found a special edition silverado With a 305 700R4 and 2.73 rear what rpm was this thing lugging on at 65-70 mph?!? 1.600 or so??? Wouldn't that be lugging the 305 like crazy? Think 3.08 to 3.42 would be much better for that engine thus better mileage or am I missing something? erik __________________ 1972 GMC 2500 Sierra 350 1971 Pontiac LeMans Sport 400 GTO/Judge Clone 1970 Pontiac GTO 400 convertible restoproject 1970 Pontiac Bonneville 455 convertible

12-28-2010, 02:50 AM	#16
bucannon Salty Sailor Join Date: May 2009 Location: Savannah, Ga Posts: 603	Re: found a special edition silverado well my truck already has 2.73 ratio open 10 bolt so i might just swap in the posi rear end and buy a gear set __________________ 86 c-10 Custom Deluxe Savannah, Georgia

12-28-2010, 02:51 AM	#17
bucannon Salty Sailor Join Date: May 2009 Location: Savannah, Ga Posts: 603	Re: found a special edition silverado and the door panels and some dash parts __________________ 86 c-10 Custom Deluxe Savannah, Georgia

12-28-2010, 11:12 PM	#18
sailed2japan Jonny Join Date: Apr 2008 Location: Outside the Box, Austin,TX Posts: 741	Re: found a special edition silverado SO how about some pics of the outside of this special beast? __________________ 1966 C30, Cummins, stacks, and a flat bed in progress... "Honor.....simply put, A veteran - whether active duty, retired, national guard or reserve is someone who, at one time in his life, wrote a blank check made payable to 'The United States of America', for an amount of 'up to and including his life.' That is Honor, and there are way too many people in this country who no longer understand it." -AEC Hundley USNR

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