The TransGo 4L80D3BRKIT (4L80-D3-BRKIT) TransBrake Kit delivers the ideal combination of street reliability and race-ready performance for 4L80E and 4L85E transmissions. It retains factory electronic shift control for daily driving while adding manual up-shift capability and transbrake functionality for hard, consistent launches at the track. With lightning-fast release in D3 (automatic up-shifts) or D1 (manual up-shifts), this kit provides total control and maximum holding power for serious performance builds.

TransGo 4L80D3BRKIT (4L80-D3-BRKIT) TransBrake Kit Features:

• Fits 4L80E and 4L85E transmissions
• Retains factory electronic shift control for street driving
• Adds manual up-shifting option for drag racing use
• Lightning-fast release launch in D3 auto mode or D1 manual mode
• Safety switch prevents accidental activation unless transmission is in first gear
• Constant line pressure for maximum holding power
• Line pressure design: 180 psi forward and 250 psi reverse
• Reverse gear requires activation for added control
• Full manual shift option included
• Not reverse-patterned

TransGo 4L80-D3-BRKIT TransBrake Kit Includes:

• TransGo engineered TransBrake assembly
• Safety pressure switch
• Drop-in pressure regulator boost valve assembly
• Constant pressure valve lineup
• Dual feed triple valve body plate and gaskets
• Electrical connectors
• Quick release direct clutch return springs (installation requires transmission removal)
• Heavy duty intermediate snap ring (installation requires transmission removal)