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Common Carrier Breaks

What is a Carrier Break?

A carrier break is where the divisional split between higher and lower gear ratios occurs. (One differential is used for higher ratios and one for lower). Carrier breaks are common in these makes: GMC, AMC, Chrysler, Dana Spicer, Toyota.

It is important to know what current gear ratio you have and if a carrier break exists so that the correct differential is used. Aftermarket gears can be found in thick cut style, which are manufactured to overcome the carrier break and take away the need to switch carriers. 

 

List of Common Carrier Breaks

Dana Spicer Carrier Breaks: 

  • Dana 27 Ratios - 3.73 Down / 3.92 +Up

  • Dana 28 Ratios - 3.45 Down / 3.73 +Up

  • Dana 30 Ratios - 3.54 Down / 3.73 +Up

  • Dana 44 Ratios - 3.73 Down / 3.92 +Up

  • Dana 60 Ratios - 4.10 Down / 4.56 +Up

  • Dana 61 Ratios - 3.31 Down / 3.54 - 4.10  thick gear / 3.54 - 4.10 

  • Dana 70 Ratios - (1/2" and 5/8") offset 4.10 & down / 4.56 +Up

  • D70-31/31" offset 3.42 & down / 3.54 to 4.10 (4.56 & up will NOT fit this housing) 

  • D80 3.73 & down / 4.10 & up 


Chrysler Carrier Breaks: 

  • 7.25" Ratios - 2.47 Down / 2.76 +Up

  • 8.25" Ratios - 2.45 Down / 2.56 +Up

 

GMC Carrier Breaks: 

  • D36 ICA Ratios - 3.07 +Up / 2.73 Down

  • D44 ICA Ratios -  3.92 +Up / 3.73 Down

  • 12 Bolt Passenger Ratios -  2.76 Down / 3.07 - 3.90 / 4.10 +Up

  • 12 Bolt Truck Ratios - 2.73 Down / 2.76 - 3.42 / 3.73 +Up

  • 10.5" 14 Bolt Ratios -  4.11 Down / 4.56 +Up

  • 7.2" IFS Ratios - 3.08 Down / 3.23 +Up

  • 7.5" Ratios - 3.08 Down / 3.23 +Up

  • 7.75" Ratios - 2.77 Down / 3.27 +Up

  • 8.2" Chevy Ratios - 2.76 Down  / 3.07 +Up

  • 8.2" BOP Ratios - 2.76 Down  / 2.94 - 3.23 / 3.31 +Up

  • 8.5" Ratios - 2.56 Down / 2.76 +Up

  • Corvette (Cast Iron) Ratios - 3.90 Down / 4.10 +Up

  • 1955-64 Chevy Passenger Ratios - 3.70 Down / 4.10 +Up

 

AMC Carrier Breaks: 

  • Model 35 Ratios - 3.31 Down  / 3.55 +Up 

  • Model 20 Ratios - 2.73 Down / 3.07 +Up

 

Toyota Carrier Breaks: 

  • 8" Ratios - 3.73 Down / 3.90 +Up  

 

Ford: 

  • No Carrier Breaks

Tags Carrier Breaks

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