Heavy towing and high-demand driving can push a standard transmission beyond its limits, leading to heat buildup, gear strain, and potential failures that compromise your truck's power and dependability.

Our heavy-duty transmission build is crafted for those who need more: up to 700 horsepower of reliable performance. Equipped with essential billet hard parts, it's designed to endure heavy towing, spirited driving, and rigorous workloads. Whether you're hauling significant loads, working your truck hard, or seeking spirited acceleration for fun, this transmission delivers strength and resilience.

With enhanced durability and smooth, confident shifts, you can trust your truck to perform without faltering, making every task manageable and enjoyable. This build has it all with a  700HP rating rear wheel horsepower. Rated at up to 700HP

• Billet Flex Plate

• Billet Input Shaft

• Sonnax HD Overdrive Shaft

• Triple Disk Goerend Low Stall Billet Torque Converter

• RedLine Transmissions Custom Built High-Pressure Billet Valvebody

• New SSV Valves

• Fully vacuum-tested fluid pump and valvebody circuits

• Custom Bonded Separator Plate

• Billet Aluminum Channel Plate

• Billet Aluminum 2C Piston 

• Billet 3-Ring Accumulators

• Custom Billet High Capacity Overdrive Drum with 50% increase in holding power

• Alto G3 Clutches and Steels (Increase holding capacity in 2nd & 4th clutch packs)

• 4C Upgraded Snap Ring retainer

• Blueprint Hard Part Inspection

• Precision Assembly

• 225PSI Line Pressure Compatible

• necessary. Including a brand-new heat-treated separator plate

• RedLine High-Performance UD, Reverse and Low Reverse Clutches and Steels

• All New Bearings

• Gaskets and Seals

• New Bonded Pistons

• New White Top Solenoid pack

• HD L/R Sprag (Roller style)

• New OE Speed Sensors and Line Pressure Sensor

• Tig Welded Input Planetary

• New MOPAR Filters

• Deep Capacity Aluminum Transmission Pan

• Bead Blasted Transmission Case painted in High-Quality Enamel Paint Signature RedLine RED

Choose this transmission if:

You tow over 12,000 lbs
You are building your transmission for longevity
Your truck is hooked to a trailer more than it is not
You have upgraded injectors or are planning to upgrade the injectors
You have an upgraded turbo or are planning to upgrade the turbo
You have oversized tires
Your horsepower level is above 550
You have a lead foot

Why Drivers Choose HD BOSS 700

• Maximized towing and hauling confidence: With a build rated up to 700 rear-wheel horsepower, you’ll have the kind of strength that handles heavy loads, steep grades, and long days on the job without transmission failure.

• Built for durability — not shortcuts: Every major component is upgraded — billet shafts, enhanced clutch packs, reinforced drums and valve bodies — so when you put your work truck or performance rig to the test, the transmission performs reliably.

• Reduced downtime, fewer repair headaches: Engineered to eliminate common failure points in stock units, this rebuild gives you long-term peace of mind and fewer surprise breakdowns.

• Smooth, confident shifts and refined drivability: It’s not just about raw power — the precision build means shifts are cleaner, smoother, and more consistent, making your truck feel better whether you’re towing, driving daily, or accelerating hard.

• Maintains value and uptime of your investment: You’re putting serious money into your truck — make sure your transmission is up to the task. A well-built unit keeps your machine working hard, keeps you on the road, and protects the rest of your drivetrain.

• Tailored to your real-world lifestyle: Whether you’re towing trailers, hauling equipment, daily driving a Duramax or Cummins powered Ram, or just want a truck that can handle whatever you ask of it — this build matches your ambition.