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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: May 2002 Posts: 10 Member | | Member Joined: May 2002 Posts: 10 | I have a 12 bolt differential with 3:73 gears. I have been considering swaping to 3:08 gears. The problem I am having is finding the correct ring and pinion for my application. I know there are several different sizes of carriers. Do I need to get a different size carrier that will accept the 3:08 gears. | | | | | Joined: Apr 2002 Posts: 11 Member | | Member Joined: Apr 2002 Posts: 11 | I recently went through my 12-bolt 3.73 on my 63 and found the gears were mounted on a 4-series carrier. For someone like yourself that wants a higher gear ratio like 3:08, you will most likely be faced with a carrier change. If that is the case, you will have the opportunity to decide on changing over to posi if you don't currently have it. I am not a big locker fan, I have had good results with an Eaton posi unit on several vehicles. These people were great to deal with- http://www.ring-pinion.com/ 1-800-292-1031 They can supply you with any parts you need and are reasonably priced.
63 K10 Fleet 454
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#7030 05/17/2002 12:25 PM | Joined: Apr 2002 Posts: 146 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2002 Posts: 146 | When I was looking into this I was told that there were two carriers made one for 3.73 and up and one for 4.11 and down. So you are most likely OK.
if it dosen't need fixed, break it
| | | | | Joined: Jan 2000 Posts: 1,586 Extreme Gabster | | Extreme Gabster Joined: Jan 2000 Posts: 1,586 | If you have a 12 bolt truck axle, GM parts book lists the 3.40-2.76 using the same carrier.The lower gear sets use another carrier. | | |
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