Differentiall Confusion
Thread Starter
Instructor
Joined: Mar 2010
Posts: 102
Likes: 0
From: Livingston TN
Differentiall Confusion
I'm trying to research the differential in my vette because it needs a rebuild. I don't want to order the wrong parts but the information i find is indifferent to itself.
Advance Auto Parts tells me that it is an 8.75" ring gear. Two pieces of original literature found online tells me that it is an 8.375" ring gear.
Also, I thought the car had a 3.08 ratio. After researching the differential housing identification stamp, it says it a 1976-77 housing with 3.08 gears. But after disassembly, the pinion has 10 teeth. According to the 1974 Chevrolet Corvette Specifications literature i found online, it says that the 3.08 ratio should have a 12 tooth pinion.
Both ratios have a 37 tooth ring gear.
What do I have????
Advance Auto Parts tells me that it is an 8.75" ring gear. Two pieces of original literature found online tells me that it is an 8.375" ring gear.
Also, I thought the car had a 3.08 ratio. After researching the differential housing identification stamp, it says it a 1976-77 housing with 3.08 gears. But after disassembly, the pinion has 10 teeth. According to the 1974 Chevrolet Corvette Specifications literature i found online, it says that the 3.08 ratio should have a 12 tooth pinion.
Both ratios have a 37 tooth ring gear.
What do I have????
Last edited by cviola2005; Sep 5, 2011 at 08:29 PM. Reason: Left out some info
Race Director
Joined: Nov 2006
Posts: 19,445
Likes: 353
From: Athens GA
St. Jude Donor '12-'13, '15- '16-'17-'18-'19, '21
I'm trying to research the differential in my vette because it needs a rebuild. I don't want to order the wrong parts but the information i find is indifferent to itself.
Advance Auto Parts tells me that it is an 8.75" ring gear. Two pieces of original literature found online tells me that it is an 8.375" ring gear.
Also, I thought the car had a 3.08 ratio. After researching the differential housing identification stamp, it says it a 1976-77 housing with 3.08 gears. But after disassembly, the pinion has 10 teeth. According to the 1974 Chevrolet Corvette Specifications literature i found online, it says that the 3.08 ratio should have a 12 tooth pinion.
Both ratios have a 37 tooth ring gear.
What do I have????
Advance Auto Parts tells me that it is an 8.75" ring gear. Two pieces of original literature found online tells me that it is an 8.375" ring gear.
Also, I thought the car had a 3.08 ratio. After researching the differential housing identification stamp, it says it a 1976-77 housing with 3.08 gears. But after disassembly, the pinion has 10 teeth. According to the 1974 Chevrolet Corvette Specifications literature i found online, it says that the 3.08 ratio should have a 12 tooth pinion.
Both ratios have a 37 tooth ring gear.
What do I have????
I would not use Advance for parts info.
Go online to vendors on this forum like Willcox, Corvette Central, Jegs, Summit, Van Steel, etc if you want good info.
Good luck
Bman
Thread Starter
Instructor
Joined: Mar 2010
Posts: 102
Likes: 0
From: Livingston TN
If your have it disassembled, then just count the number of teeth on the ring gear and divide it by the number of teeth on the pinion gear. That is your ratio
I would not use Advance for parts info.
Go online to vendors on this forum like Willcox, Corvette Central, Jegs, Summit, Van Steel, etc if you want good info.
Good luck
Bman
I would not use Advance for parts info.
Go online to vendors on this forum like Willcox, Corvette Central, Jegs, Summit, Van Steel, etc if you want good info.
Good luck
Bman
I don't believe Advance on any information anymore. Seems like alot of parts I buy from there for the vette are wrong. So I will believe the two pieces of original literature saying that it is an 8.375" ring gear.
Race Director
Joined: Nov 2006
Posts: 19,445
Likes: 353
From: Athens GA
St. Jude Donor '12-'13, '15- '16-'17-'18-'19, '21
Thanks. its a 10 tooth pinion and a 37 tooth ring making it a 3.70 ratio.
I don't believe Advance on any information anymore. Seems like alot of parts I buy from there for the vette are wrong. So I will believe the two pieces of original literature saying that it is an 8.375" ring gear.
I don't believe Advance on any information anymore. Seems like alot of parts I buy from there for the vette are wrong. So I will believe the two pieces of original literature saying that it is an 8.375" ring gear.
Burning Brakes
Joined: Sep 2008
Posts: 805
Likes: 5
From: Naperville Illinois
) If your gears need replacing, I recommend US Gears from Tom's Differentials. Here is a pic with the original gears on the left and the new ones on the right:
