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48RE Transmission Stage 2 650HP Max

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Core Charge: +$2000

Stage 2 48RE - 650HP Max

03-07 5.9 Commonrail Cummins


The Stage 2 48RE transmission is the most popular build for the 03-07 5.9 Cummins trucks; rated for up to 650 horsepower. This transmission is built with heavy-duty components, including a billet input shaft, upgraded clutches and bands, and a modified valve body, making it more durable and reliable. To help harness the power your truck makes, we couple the transmission with is our in-house built triple disc converter, which provides increased lockup, resulting in better acceleration and pulling power.

  • Our most popular build
  • GPZ or equivalent Clutches, New steels
  • Power-packed overdrive with custom pressure plate
  • Power-packed Direct Drum with custom pressure plate
  • TCS super servo, Billet band strut, Billet wedge
  • Billet Accumulator
  • Sonnax or equivalent Billet Input shaft with custom height billet direct drum piston
  • H/D 2nd gear band
  • Randys Triple Disc Torque Converter
  • Borg Warner Governor pressure solenoid
  • High pressure transducer
  • HD cast aluminum deep pan
  • Custom high pressure valve body
  • PTFE coated thrust washers
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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