History

• The four-speed automatic was produced by the Chrysler Corp. from 1994 to 2001, and the six-speed manual gearbox was produced for 1999-2001 Dodge Rams, according to Allpar.com and Dodgeram.com.
  
  

42RH Gear Ratio

• The gear ratios for the 42RH are: 2.74:1 for first gear; 1.54:1 for second; 1.00:1 for third; and 0.69:1 for fourth gear.
  
  

46RH Gear Ratio

• The 47RH gear ratios are: 2.45:1 for first gear; 1.45:1 for second; 1.00:1 for third; and 0.69:1 for fourth gear.
  
  

Manual Gear Ratio

• The six-speed manual gear ratios are: 5.63:1 for first gear; 3.38:1 for second; 2.04:1 for third; 1.39:1 for fourth; 1.00:1 for fifth; and 0.073:1 for sixth gear.
  
  

Automatic Differences

• A different version of the 47RH automatic, the 47RE, featured an electronically controlled governor instead of the 47RH's standard hydraulic-controlled governor.
  
  

Applications

• The four-speed automatics were standard equipment on Dodge Rams with V-6 and V-8 engines. The six-speed manuals could be ordered for 5.9-liter Cummins diesel and 8-liter V-10s.