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48RE Transmission Stage 1 400HP Max

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Core Charge: +$2000

Stage 1 48RE - 400HP

03-07 5.9 Commonrail Cummins

Stage 1 450hp max

  • Sonnax or equivalent heavy duty direct drum piston
  • Single disc billet Torque Converter
  • GPZ or equivalent clutches and steels
  • Power-packed overdrive
  • High pressure valve body
  • Billet band strut
  • Billet Accumulator
  • HD Flexband
  • Borg Warner Governor pressure solenoid
  • High pressure transducer
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2 Year unlimited mile limited warranty will not cover broken cases or shafts of transmission. Abuse, misuse, or burn down due to operator error will void warranty. Any warranty work must be performed at Randy’s Transmissions in Tooele UT. It is the vehicle owner’s responsibility to ship transmission or vehicle to Randy’s location for any and all repairs needing to be performed. Any repairs to transmission not authorized by Randy’s Transmissions will void warranty and will not be covered by Randy’s Transmissions.



Appropriate gear ratios

  • 35" tire min gearing is 3:73 recommended 4:10
  • 37" tire min gearing is 4:10 recommended 4:30
  • Larger than that should be running a 4:56 ratio