4R100 vs Allison 1000 vs 47RE

Automatic Transmission Comparison

 

 

Transmission:

Ford 4R100 4 speed automatic

Allison 1000 5 speed automatic

47RE 4 speed automatic

Applications:

1999 - 2003 Ford Super Duty

2001 - 2005 Chevrolet/GMC HD

1996 - 2002 Dodge Ram

1st Gear:

2.71 : 1

3.10 : 1

2.45 : 1

2nd Gear:

1.54 : 1

1.81 : 1

1.45 : 1

3rd Gear:

1.00 : 1

1.41 : 1

1.00 : 1

4th Gear:

0.71

1.00 : 1

0.69 : 1

5th Gear:

N/A

0.71 : 1

N/A

Reverse:

2.88 : 1

4.49 : 1

2.21 : 1

Max. Input Torque:

1000 lb-ft

520 - 565 lb-ft

Approx. 450 lb-ft

 

Ford rates the 4R100 input torque to include torque multiplication across the torque converter do to slippage, whereas GM and Dodge have provided the maximum engine torque for the Allison 1000 and 47RE respectively. Therefore, though the 4R100 appears to have a significantly higher input torque capacity, it's maximum engine torque input is somewhere near the Allison 1000. In reference to gear spread and step, the Allison 1000 holds a clear advantage over both the 47RE and 4R100 transmissions. Its relatively low 1st gear contributes to superior low speed two performance and the Allison's 4.49 to 1 reverse ratio is favorable to either of its competitors.