GearStar Performance 4L65E Transmissions Are Built to Handle Big Power

GM’s 4L65E is a very popular transmission for LS and believe it or not, small block Mopar and Gen III Hemi swaps. Get a GearStar Level 3 or Level 4 4L65E Transmission and you’ll have a good one. Each transmission is built by a single tech from start to finish—they even hand stamp the transmission with the builder’s initials and serial number.

GearStar also goes through the trouble to custom-build Yank torque converters in-house using the same processes used by GM, Ford, and Chrysler. They feature custom-machined pumps and billet stators to increase flow and maximize pressure for consistent shifts.

Every transmission/torque converter combo is put on a dyno and run to the equivalent of 60 miles on the street and at speeds of up to 130 MPH. This process confirms line pressures, shift points, and downshifts as well as converter stall speed and lockup operation.

GearStar backs their transmissions with a limited three-year/36,000-mile warranty against failure due to defects in workmanship and/or parts. That’s a strong warranty for a performance transmission.

GearStar transmissions are covered by a limited three-year/36,000 mile warranty against failure due to defects in workmanship and/or parts. That’s a strong warranty for a performance transmission.

Level 3 4L65E Transmissions
Level 3 transmissions are rated to handle up to 500 horsepower and 500 lbs.-ft. of torque. They come with a 12-inch converter with furnace-brazed fins and 2,600 to 3,200 RPM stall speed depending on application. Features include:
• Flanged hub and carbon fiber clutch
• Alto hardened steels and Raybestos Stage 1 frictions
• 29-element dual cage sprag
• High-capacity pump assembly with hardened rings and 13-vane rotor
• TransGo reprogramming shift kit with Shift Command
• Complete Torrington bearing kit
• Heavy-duty hardened sun shell
• Heavy-duty expanded capacity input drum with reinforcing sleeve
• High-rev spring kit and Corvette servo
• Carbon fiber wide 2-4 band
• New shift solenoids, EPC solenoid, PWM solenoid, and 3/2 solenoid
• New internal wiring harness with new TCC solenoid
• New electronic speed sensor
• Transmission mount and new OEM steel pan

Level 4 4L65E Transmissions
These transmissions are rated to handle up 650 horsepower and 600 lbs.-ft. of torque and come with a 10- or 11-inch lockup torque converter available in various stall ratings. They’re built with all of the Level 3 components plus these upgrades:
• Raybestos Gen II racing frictions
• Five-pinion heavy-duty front and rear planetary gear sets with sun gear
• Hardened output shaft
• Hardened reaction shaft and hub
• Super hold 4th servo

Summit Racing also carries these GearStar transmissions in Level 3 and Level 4 configurations:
• GM 4L60E and 4L70E
• GM 4L80E and 4L85E
• GM 6L80E and 6L90E
• Ford 4R70W
• Ford E4OD/4R100
• Ford 6R80

SEE SUMMIT RACING’S SELECTION OF GEARSTAR TRANSMISSIONS