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Aug 17, 2007 | 07:58 AM

glo

Thread Starter

Instructor

Joined: Mar 2007

Posts: 173

Likes: 0

From: Avon Park FL

rear end

How can I tell what gear size I have in 77 corvette doing a rebulid with about 320-350 hp just wondering if I should change gears this is mostly for street I already have trailing arm ,spring out just thinking with everything out if I need to do anything with the rear end

Aug 17, 2007 | 08:01 AM

bluesilver82

Burning Brakes

Joined: Jan 2006

Posts: 1,154

Likes: 1

From: St Augustine FL

Quote:

Originally Posted by glo

I am about to swap to a 3;73 in my 82 my stock is 2.72 yours is probably 3.03 or something like that.

Aug 17, 2007 | 08:14 AM

BB68Vett

Burning Brakes

Joined: Feb 2001

Posts: 929

Likes: 5

From: Marietta GA

Turn the halfshafts one full revolution and count how many times the driveshaft rotates. This is your ratio.

Aug 17, 2007 | 08:15 AM

Mikes*Corvettes

Pro

Joined: Oct 2006

Posts: 564

Likes: 0

From: London

Quote:

Originally Posted by glo

Axle codes are stamped on the bottom of the differential carrier housing just forward of the cover,check your code against these codes for the 76/77 model

OA 3.08:1
OD 3.36:1
LR 3.36:1
OB 3.55:1
OC 3.70:1

Aug 17, 2007 | 08:16 AM

Gordonm

Race Director

Joined: Dec 1999

Posts: 19,610

Likes: 778

From: Forked River NJ

It will be a 3.08, 3.36,3.55,3.73 or possibly 4.11. Take your axle coming out of the rear and spin it exactly ONE revolution and count the number of times the driveshaft goes around. 3 1/4 times you have a 3.36, 3 1/2 times a 3.55 and so on. If the halfshafts and tires are still on just rotate the tire exactly ONE revolution and count the driveshaft revs.

Sep 20, 2007 | 11:43 AM

HUSKER-Z

Pro

Joined: Jun 2007

Posts: 584

Likes: 0

From: Omaha NE

I have a 3:08 in right now. What would be the difference in going up a level or two? Mechanic said 4:11 wouldn't be a good daily driver??

Sep 20, 2007 | 12:24 PM

Scott Marzahl

Le Mans Master

Joined: Apr 2005

Posts: 6,339

Likes: 416

From: Seattle Area WA

For a stock L-48, I think a 3.36 would be a good upgrade. If it was a warmed over 350, I might consider a 3.55, it just depends on how often you drive the car.

Sep 21, 2007 | 02:58 PM

HUSKER-Z

Pro

Joined: Jun 2007

Posts: 584

Likes: 0

From: Omaha NE

Went w/ a 3:55 from Ikerds (sponser on here). Time will tell, once it gets here and is installed!

thanks for all your help S!

David

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Sep 21, 2007 | 08:34 PM

72LS1Vette

Safety Car

Joined: Aug 2001

Posts: 4,883

Likes: 11

From: North Easton Mass

Quote:

Originally Posted by glo

As long as you have everything apart, take off the diff cover and take a good look at the internals. If everything is good it will only cost you a gasket, and the fluid probably needs to be changed anyway. If there is excessive play in the yolks (more than 1/16" or so - opinions differ) or the ends of the yolks are mushroomed you will need to do a rebuild. If a rebuild is needed you can decide on what gears you want to use.

Rick B.

Sep 21, 2007 | 11:26 PM

#10

sly vette

Safety Car

Joined: Oct 2005

Posts: 3,570

Likes: 1

From: Algonac Michigan

I'm not much for just posting icons but here goes

Sep 23, 2007 | 01:24 PM

#11

JustinD

Safety Car

Joined: Jun 2005

Posts: 3,841

Likes: 0

From: Inver Grove Minnesota

I put 4.10's in and it is a little much esp with a 3 speed auto. Although it is crazy off the line.

Oct 2, 2007 | 09:35 PM

#12

SUPERPOWERS

Pro

Joined: Sep 2006

Posts: 559

Likes: 5

From: WATERTOWN SOUTH DAKOTA

Quote:

Originally Posted by bluesilver82

I am about to swap to a 3;73 in my 82 my stock is 2.72 yours is probably 3.03 or something like that.

Damn, 2.72 that sucks. I also have an 82 and I am running a T56 6speed. I am going to put in 4.10's. Do you know what rearend is on our cars? I heard somewhere that they were Dana 38's. Also which carrier is in there? Did you need to change the carrier for the new gears?

thanks,
Josh

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