Built Transmissions

Our built transmissions are engineered to handle real power, real use, and real abuse. Whether you’re towing heavy loads, daily driving with added performance, or pushing serious horsepower at the track, we build each transmission with upgraded internals and proven components for strength, reliability, and long-term durability. Every build is tailored to your truck, power goals, and intended use to ensure consistent performance under pressure.

Built for Your Power Level

Every transmission is matched to your setup — from mild towing builds to high-horsepower competition applications.

Strengthened Internal Components

Upgraded clutches, valve bodies, torque converters, and hard parts designed to handle increased load and power.

Proven Performance & Reliability

Built to perform under real-world conditions with a focus on durability, shift quality, and long-term dependability.

Compare the Series

From torque converters and upgraded shafts to internal hard-part improvements, every series is designed with specific performance and durability goals in mind.

Torque Converter

Tow Plus: Goerend Single Disc Torque Converter

All other Series: Goerend Triple Disc Torque Converter

Input Shaft

Tow Plus: Stock Input Shaft

Street: Goerend 23 Spline Billet 300M One-Piece Shot Peened Input Shaft

Street Elite & Competition: Sonnax 23 Spline Billet Input

Competition Elite: Sonnax 35 Spline Billet Input, With Custom Stator

Output Shaft

Tow Plus & Street: Stock

Street Elite & Competition: TCS 23 Spline Billet Output

Competition Elite: TCS 29 Spline Billet Output

Intermediate Shaft

Tow Plus, Street, & Street Elite: Stock

Competition & Competition Elite: TCS Billet Intermediate Shaft

Tow Plus Tramsmission

$3,900.00

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Darkside Diesel Tow Plus 47/48re Transmission

 

$

Description

Features:

  • Built for Towing & Daily Driving with Mild Power Upgrades, Not Exceeding 400Hp
  • This Transmission is for Hard-Working Trucks that Tow Heavy.
  • 2 Year 100% Craftsmanship Warranty

Build List:

  • Goerend Single Disc Torque Converter- 3 Year Warranty
  • Muldoon’s Valve Body-Less Aggressive Shifts and Smooth TC Lock Up
  • TCS Billet 2nd Gear Servo, 4.2 Apply Ratio Lever, Anchor & Strut
  • TCS Billet Accumalator Piston
  • Goerend Deep Pan
  • GPZ Clutches
  • BorgWarner Kick Down Band
  • Increased Clutches in the Direct Drum & Overdrive Brake
  • New Overdrive Direct Snap Ring
  • New Reverse Band
  • New O/D Roller bearings

Street Series Transmission

$5,400.00

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Darkside Diesel Street Series 47/48re Transmission

 

$

Description

Features:

  • Built for the Street, 550Hp Capable
  • Designed for the Person Who Wants to Add Some Extra Power To Their Truck
  • 2 Year 100% Craftsmanship Warranty

Build List:

  • Goerend Triple Disc Torque Converter-3 Year Warranty
  • Billet SFI Approved Flexplate
  • Muldoon’s Valve Body-Less Aggressive Shifts and Smooth TC Lock Up
  • Goerend 23 Spline Billet 300M One-Piece Shot Peened Input Shaft
  • TCS Billet 2nd Gear Servo, 4.2 Apply Ratio Lever, Anchor & Strut
  • TCS Billet Accumalator Piston
  • Goerend Deep Pan
  • GPZ Clutches
  • BorgWarner Kick Down Band
  • Increased Clutches in the Direct Drum & Overdrive Brake
  • New Overdrive Direct Snap Ring
  • New Reverse Band
  • New O/D Roller bearings

Street Elite Series Transmission

$6,500.00

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Darkside Diesel Street Elite 47/48re Transmission

 

$

Description

Features:

  • Built for Street and Track Use
  • This Transmission was Built for the Person Looking to Make Up to 800Hp and do 4×4 Boosted Launches at the Track
  • 2 Year 100% Craftsmanship Warranty

Build List:

  • Goerend Triple Disc Torque Converter-3 Year Warranty
  • Billet SFI Approved Flexplate
  • Muldoon’s Valve Body
  • Sonnax 23 Spline Billet Input
  • TCS 23 Spline Billet Output
  • TCS Billet 2nd Gear Servo, 4.2 Apply Ratio Lever, Anchor & Strut
  • TCS Billet Accumalator Piston
  • Goerend Deep Pan
  • GPZ Clutches
  • BorgWarner Kick Down Band
  • Increased Clutches in the Direct Drum & Overdrive Brake
  • New Overdrive Direct Snap Ring
  • New Reverse Band
  • New O/D Roller bearings

Competition Series Transmission

$7,600.00

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Darkside Diesel Competition Series 47/48re Transmission

 

$

Description

Features:
  • Built for Racing, and vehicles making up to 1,000Hp
  • 2 Year 100% Craftsmanship Warranty
Build List:
  • Goerend Triple Disc Torque Converter-3 Year Warranty
  • Billet SFI Approved Flexplate
  • Muldoon’s Valve Body
  • Sonnax 23 Spline Billet Input
  • TCS Billet Intermediate Shaft
  • TCS 23 Spline Billet Output
  • TCS Billet 2nd Gear Servo, 4.2 Apply Ratio Lever, Anchor & Strut
  • TCS Billet Accumalator Piston
  • Goerend Deep Pan
  • GPZ Clutches
  • BorgWarner Kick Down Band
  • Increased Clutches in the Direct Drum & Overdrive Brake
  • New Overdrive Direct Snap Ring
  • New Reverse Band
  • New O/D Roller bearings

Competition Elite Series Transmission

$9,300.00

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Darkside Diesel Competition Elite Series 47/48re Transmission

 

$

Description

Features:
  • Built for All Out Competition. Making Over 1,000Hp? Love Doing Rolling Burnouts and Boosted Launches! This is Your Transmission!
  • 2 Year 100% Craftsmanship Warranty
Build List:
  • Goerend Triple Disc Torque Converter-3 Year Warranty
  • Billet SFI Approved Flexplate
  • Muldoon’s High-Pressure Valve Body
  • Sonnax 35 Spline Billet Input, With Custom Stator
  • Sonnax Billet Direct Apply Piston
  • TCS Billet Intermediate Shaft
  • TCS 29 Spline Billet Output
  • TCS Billet 2nd Gear Servo, 4.2 Apply Ratio Lever, Anchor & Strut
  • TCS Billet Accumalator Piston
  • Goerend Deep Pan
  • GPZ Clutches
  • BorgWarner Kick Down Band
  • Increased Clutches in the Direct Drum & Overdrive Brake
  • New Overdrive Direct Snap Ring
  • New Reverse Band
  • New O/D Roller bearings

*Full Manual Valve Body Required for 1,500Hp and up.