68RFE Black Widow 850 w/ Free Billet Flex Plate

The Black Widow 850 from Next Level Engine & Transmission is engineered for high-performance builds that demand both power and reliability. Rated to handle up to 850 horsepower, this transmission is the go-to choice for 68RFE-equipped trucks that work hard, drive harder, and need a drivetrain that won’t back down.

The Black Widow 850 delivers firm, consistent shifts and exceptional line pressure control under extreme load. Built to handle heavy towing, performance driving, and demanding conditions, it’s the transmission that gives you the freedom to push your truck to its limits with total confidence.

RECOMMENDED FOR:

• Trucks producing up to 850 HP
  
• Heavy towing and performance driving
  
• Trucks running 35” tires or smaller
  
• Drivers wanting a balance of power and durability
  

THIS TRANSMISSION FEATURES THE FOLLOWING:

UPGRADED INTERNAL COMPONENTS:

• 16 Clutch Overdrive Billet Aluminum Drum With Steel Inner Drum
• Next Level Transmission Blacklist Billet Triple Disk Converter
• Next Level Transmission Heavy Duty Roller Sprag
• Next Level Transmission Billet Input Shaft
• Revmax 300M One Piece FORGED Billet Overdrive Clutch Hub and Shaft Assembly
• Next Level High Performance Borg Warner Clutch Kit
• Extra Capacity Transmission Deep Pan
• Next Level Billet 4C snap ring retainer
• Next Level Billet 2C Piston
• New Sonnax Pump Gear
• Next Level 2C Clutch Count Upgrade
• Next Level 4C clutch count upgrade
• New OEM Line Pressure Sensor
• All new OEM seals and gaskets
• OEM Filter Kit
• Next Level High Pressure Valve Body with
  • Brand New OEM Solenoid Pack
  • Billet accumulators
  • Billet Channel Plate 
  • Performance SS Valve4
  • High Performance Separator plate
• Tig Welded Output Planets

*FREE Billet Flexplate

TUNER INFORMATION:

For the 68RFE Black Widow 850, the following settings should be used to properly tune the transmission:

• Line pressure set to 225 PSI above 30% throttle angle
  
• 100 PSI resting pressure
  
• No lockup until 4th gear
  
• Low/reverse sprag holdout enabled
  
• For 2019 and newer models, the under-drive pulse test must be turned off.

Download 68RFE Installation Instructions HERE.

WARRANTY:

Includes: a 2-year / unlimited miles warranty. 

Important Notice: Trucks equipped with tires larger than 35 inches are not covered under warranty unless there is documented proof of a differential gear ratio change.

NOTE:

Next Level Engine & Transmission reserves the right to alter, update, or substitute build components and specifications at its discretion, without prior notice or obligation. These adjustments may be made to help customers meet specific timelines while maintaining the highest standards of quality, durability, and efficiency.

RETURNS:

*We accept returns within 10 days of receipt, as long as the transmission is in like-new condition and has not been installed. Please note that a 25% restocking fee applies, and customers are responsible for return shipping costs.