ring and pinion for a 2 series carrier - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-05-2005, 08:22 PM
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ring and pinion for a 2 series carrier

I have trying to find out if i can run a 3 series gear on a 2 series carrier without using a ring gear spacer or replacing the carrier.And i have found a 3 series gear that is thick on reider racing.com its not quite what i wanted its a 3.90 and i was knid of looking for a 3.73 for my car.My car has a 12 bolt posi and i was wondering if it would worth the effort to buy this type of gear or just buy the 3 series carrier to mimize the hazzle .And i was concerned that a 3.90 would turn to high of rpm's at cruise for my small block?

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Old 12-05-2005, 09:20 PM
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I would just buy the new diff.. The $500 you spend now will be money well spent in the long run (New unabused parts, warranty, and stronger than factory). If the original diff. is a posi, I'd put it on E-bay to try and recoup some of the money. 3.73 is a nice all around ration but you should do the math with your tire size, tranny final drive, rear gear, and cruising rpm.

(tire diameter X 3.14) = circumfrence in inches

circ. in/12 = circ. in feet

5280/circ. in ft = tire rotations per mile

tire rotations X gear ratio = engine RPM @ 1.0 trans ratio without overdrive (this number is not including any converter slippage)

RPM @ 1.0 X overdrive ratio = final RPM if there is an overdrive

This formula should get you darn close to the RPM you will be running with a given gear and tire combination. Take some time to play with it and see what you find.
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Old 12-05-2005, 09:30 PM
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Possibly this may help...?

Chevrolet generally used three different types of differentials for the 12-bolt: the Two Series carrier, the Three Series carrier, and the Four Series carrier. The "Two Series" has little use in a hi-po application and should be avoided if at all possible. The Three Series carrier accepted ring and pinions that ranged from 3.08:1 to 3.73:1, while the Four Series carrier accepted ring and pinions ranging from 3.90:1 to 6.14:1. While there are a number of subtle variations between the three types of carriers, a major difference is the thickness of the gear flange. Two Series carriers are the thinnest, while Three Series flanges are thinner than Four Series flanges. Because of the size of the flange, the carriers cannot be randomly used with ring and pinion sets from the trio of "families" (unless, of course, special gears with custom ring gear mounting surfaces are used. These special gears are readily available from Richmond Gear). Additionally, the Two Series carriers do not have any webs on the top of the carrier. Three and Four Series carriers do have webs. (taken from http://www.hotrod.com/techarticles/2949/)
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Old 12-05-2005, 09:32 PM
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You can also use this formula to determine any part of the equation if you have the info surrounding it. Example: You know the RPM and tire size you can equate the gear ratio. OR You know the tire size gear, ratio, and RPM you can figure your overdrive gear. I hope this helps in making a descision.
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Old 12-06-2005, 10:24 PM
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2 Series Carrier

12 Bolt Passenger Carrier Breaks
2.73 & Numerically Lower
3.08 to 3.90
4.10 & Numerically Higher

Strongly recommend a different carrier and NOT using a spacer, bolts break off easily.
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