Steves Camaro Parts - First Generation Camaro Differentials Data



Camaro 1967-1969

10-bolt12-bolt
Casting Number3894859NF3894860NF
Bolt Diameter3/83/8
Ring Gear Diameter8.208.875
Pinion Diameter1.4381.625
Axle Splines2830
Overall Dimensions:  
Axle tube flange to axle tube flange54 1/454 1/4
Between centerlines of spring seats42 7/1642 7/16
Shaft Length29 33/6429 9/16
Below is a list of positraction casting numbers. Gearing "up" indicates that the Posi Traction Unit is applicable to gearing Numerically Higher. Gearing "down" indicates that the Posi Traction Unit is applicable to gearing Numerically Lower.
Axle
Casting Number
Series
Gearing
12-bolt passengerED 32088
2
2.73:1 and down
30140PM1
3
3.08 to 3.73:1
EDB 30174
4
3.90:1 and up
CorvetteED 32297 PW 3
3
2.73 to 3.70:1
EDB 32298
4
3.90:1 and up
8.5 Corporate410408N
3
2.73:1 and up
410409N
2
2.56:1 and down
8.2 10-boltED 32118
2
2.73:1 and down
ED 30116
3
3.08:1 and up


Here we show you a picture with the location of the Casting numbers for both 10 and 12 bolt differentials and the location for the Axle Stamp. The graphic is a Courtesy of Steve Brown.
Chevy Rear Axle Sketch 

10 Bolt Vs. 12 Bolt

12 Bolt Chevy Differential
10 Bolt Chevy Differential
Which one is better? Great question. And the answer is: it depends. The 10 bolt is lighter and needs more power to turn. The 12 bolt is a heavy duty unit, much stronger, but is HP hungry and will suck your car more horses. Take a look at your aplication, and then decide wich one is for you. Usually, behind aBig Block Chevy, you´ll want to use the12 bolt axle.

source: http://www.firstgencamaro.com/rearend.html




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