What gears are in it? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

86 Canuck · 11-08-2005, 08:52 PM

My truck is an 86 Sierra Classic. It had a 305/TH350 with air. The rear has never been out of it. I'm just curious on what gears may be in my truck.
Thanks

SLIMJIM · 11-08-2005, 10:12 PM

273:1 possibly. Check RPO sticker in your glovebox.

Curt

MylilBowTie · 11-08-2005, 10:18 PM

Most common gears are 2.73 and 3.08 ratios. But it could of been ordered with a pretty wide list of gears to choose from if they wanted.

The RPO might help if the differential has never been removed. There is a production code on the passenger side axle tube. That will tell what it was installed from the factory with. The only real way to tell is taking the cover off and looking. Not saying that you have to do so but you wont have any doubts about what it might be anymore.

Slonaker · 11-09-2005, 01:08 AM

My '86 Chevy lists the rear gears as 3.08 in the glove compartment. Most seem to have the 2.73 gears, though.

Slonaker

86 Canuck · 11-09-2005, 10:26 PM

Thanks I'll check out the codes when I get it back from the shop.

Slonaker · 11-09-2005, 11:36 PM

Quote:

Originally Posted by 86 Canuck

Thanks I'll check out the codes when I get it back from the shop.

Mine does not even have a code. It just says it is 3.08. So simple that even I could figure it out.

Slonaker

86 Canuck · 11-10-2005, 11:08 PM

Where did you find it? Was it on the housing? In the glove box? I get it back tomorrow.

MylilBowTie · 11-11-2005, 06:59 AM

RPO list should be on the driverside fender on newer 81-87 trucks and in the glove box on the inside of the door pannel 73-80. Those are loose years but thats where the RPO list should be if it has one.

Does the truck have a tachometer installled?

86 Canuck · 11-13-2005, 08:05 PM

THe tach will be installed when I get it back from the shop.

Ironclad454 · 11-13-2005, 08:19 PM

Quote:

Originally Posted by MylilBowTie

RPO list should be on the driverside fender on newer 81-87 trucks and in the glove box on the inside of the door pannel 73-80. Those are loose years but thats where the RPO list should be if it has one.

Does the truck have a tachometer installled?

I think you've got it backwords there. I own a 73 and the RPO list is on the Driverside Inner fender in the the engine compartment.

ElGracho · 11-13-2005, 10:40 PM

Quote:

Originally Posted by Ironclad454

I think you've got it backwords there. I own a 73 and the RPO list is on the Driverside Inner fender in the the engine compartment.

I think this depends on the factory. All of my trucks (see sig) have the RPO list in the glove box except my 84. It's on the drivers side inner fender. It was built at the Oshawa, Ontario Canada plant. My 86 project truck was too but it's in the glove box. The others were built in Janesville, St. Louis, Flint, and Freemont California and all had them in the glove box.

86 Canuck · 11-14-2005, 06:37 PM

Mine is in the glove box. I still can't check it out.

Slonaker · 11-14-2005, 10:13 PM

Quote:

Originally Posted by 86 Canuck

Where did you find it? Was it on the housing? In the glove box? I get it back tomorrow.

I said in my previous post it was in the glovebox.

Slonaker

86 Canuck · 11-16-2005, 09:07 PM

I've got it back, it doesn't say anything. It just has a bunch codes on it. I'll jack her up and rotate the wheels and ballpark it.

11-08-2005, 08:52 PM	#1
86 Canuck Registered User Join Date: Oct 2005 Location: Leamington Ontario Posts: 44	What gears are in it? My truck is an 86 Sierra Classic. It had a 305/TH350 with air. The rear has never been out of it. I'm just curious on what gears may be in my truck. Thanks

11-08-2005, 10:12 PM	#2
SLIMJIM Registered User Join Date: Sep 2005 Location: Charleston, South Carolina Posts: 285	Re: What gears are in it? 273:1 possibly. Check RPO sticker in your glovebox. Curt __________________ 1970 Chevrolet Blazer 2 wheel drive - SOLD

11-08-2005, 10:18 PM	#3
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Re: What gears are in it? Most common gears are 2.73 and 3.08 ratios. But it could of been ordered with a pretty wide list of gears to choose from if they wanted. The RPO might help if the differential has never been removed. There is a production code on the passenger side axle tube. That will tell what it was installed from the factory with. The only real way to tell is taking the cover off and looking. Not saying that you have to do so but you wont have any doubts about what it might be anymore. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI Last edited by MylilBowTie; 11-08-2005 at 10:29 PM.

11-09-2005, 01:08 AM	#4
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Re: What gears are in it? My '86 Chevy lists the rear gears as 3.08 in the glove compartment. Most seem to have the 2.73 gears, though. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

11-09-2005, 10:26 PM	#5
86 Canuck Registered User Join Date: Oct 2005 Location: Leamington Ontario Posts: 44	Re: What gears are in it? Thanks I'll check out the codes when I get it back from the shop.

11-10-2005, 11:08 PM	#7
86 Canuck Registered User Join Date: Oct 2005 Location: Leamington Ontario Posts: 44	Re: What gears are in it? Where did you find it? Was it on the housing? In the glove box? I get it back tomorrow. __________________ Trucks:86 GMC C15 Longbox , 05 Silverado 4x4 The other one: 89 Mustang LX In pieces, 93 Tempo

11-11-2005, 06:59 AM	#8
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Re: What gears are in it? RPO list should be on the driverside fender on newer 81-87 trucks and in the glove box on the inside of the door pannel 73-80. Those are loose years but thats where the RPO list should be if it has one. Does the truck have a tachometer installled? __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

11-13-2005, 08:05 PM	#9
86 Canuck Registered User Join Date: Oct 2005 Location: Leamington Ontario Posts: 44	Re: What gears are in it? THe tach will be installed when I get it back from the shop. __________________ Trucks:86 GMC C15 Longbox , 05 Silverado 4x4 The other one: 89 Mustang LX In pieces, 93 Tempo

11-14-2005, 06:37 PM	#12
86 Canuck Registered User Join Date: Oct 2005 Location: Leamington Ontario Posts: 44	Re: What gears are in it? Mine is in the glove box. I still can't check it out. __________________ Trucks:86 GMC C15 Longbox , 05 Silverado 4x4 The other one: 89 Mustang LX In pieces, 93 Tempo

11-16-2005, 09:07 PM	#14
86 Canuck Registered User Join Date: Oct 2005 Location: Leamington Ontario Posts: 44	Re: What gears are in it? I've got it back, it doesn't say anything. It just has a bunch codes on it. I'll jack her up and rotate the wheels and ballpark it. __________________ Trucks:86 GMC C15 Longbox , 05 Silverado 4x4 The other one: 89 Mustang LX In pieces, 93 Tempo



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.