The Texas Speed 4L65E Performance Transmission is a fully rebuilt and upgraded 4L65E for four-wheel-drive LS-powered GM vehicles from 2007 to 2008 that use the 15-pin case connector. Texas Speed rates the unit for up to 600 rear-wheel horsepower, making it a direct replacement for a worn factory transmission in a cammed, bolt-on or mildly boosted LS car or truck.
Inside, the transmission gets all new frictions and steels with a 7-clutch GPZ 3-4 stackup, heavy-duty front and rear sprags, 5-pinion front and rear planetary gearsets, a reinforced input drum with billet overrun apply piston, a wide red 2-4 band on a new reverse input drum and a heavy-duty sunshell. The rebuilt pump uses a .500 boost valve and High-Rev vane rings rated to 9,000 rpm, and the rebuilt valve body carries a heavy-duty shift kit that allows full manual downshifts from 3rd through 1st and holding 1st or 2nd at any speed. A Corvette servo with billet 4th apply piston and cover completes the build. Texas Speed covers the unit with a 30 day warranty from delivery.
Specifications
- Transmission: GM 4L65E, 4WD
- Application: 2007 to 2008 GM LS vehicles with 15-pin case connector
- Power rating: Up to 600 rear-wheel horsepower
- Clutches: All new frictions and steels, 7-clutch GPZ 3-4 stackup
- Sprags: New heavy-duty front and rear sprags
- Planetaries: New 5-pinion front and rear planetary gearsets
- Input drum: Reinforcement kit with new billet overrun apply piston
- 2-4 band: New wide red band with new reverse input drum
- Sunshell: Redesigned heavy-duty sunshell
- Bushings: Complete bushing kit with wide rear sun gear bushing
- Valve body: Rebuilt with heavy-duty shift kit and heavy-duty 3rd shift valve; manual 3-2-1 downshifts and 1st or 2nd gear hold
- Pump: Rebuilt with new rotor, vane and slide kit, .500 boost valve, new pressure regulator valve, High-Rev vane rings rated to 9,000 rpm
- 3-4 clutch piston: Redesigned return springs to reduce centrifugal 3-4 apply above 5,500 rpm in 1st gear
- Servo: Corvette servo upgrade with billet 4th apply piston and cover
- Electronics: New electronics throughout including wiring harness; new filter; complete overhaul kit (seals, gaskets, rings)
- Warranty: 30 days from time of delivery; shipped in a reinforced plain double-wall box
Note: This is the 4WD version. Texas Speed sells a separate 2WD 4L65E for the same model years. Confirm the drivetrain and the 15-pin case connector on the transmission being replaced before ordering. Texas Speed's page does not state whether a torque converter is included or whether a core charge applies.
Vehicle Applications
Texas Speed lists this transmission for 2007 to 2008 LS applications with the 15-pin connector. The vehicle list below is narrowed to those model years; confirm the transmission in the vehicle matches before ordering.
Chevrolet Corvette
- 2007 Chevrolet Corvette
- 2008 Chevrolet Corvette
Cadillac CTS-V
- 2007 Cadillac CTS-V
- 2008 Cadillac CTS-V
Cadillac Escalade
- 2008 Cadillac Escalade
Pontiac G8
- 2008 Pontiac G8
GMC Sierra 1500
- 2007 GMC Sierra 1500
- 2008 GMC Sierra 1500
GMC Sierra 2500
- 2007 GMC Sierra 2500
Chevrolet Silverado 1500
- 2007 Chevrolet Silverado 1500
- 2008 Chevrolet Silverado 1500
Chevrolet Silverado 2500
- 2007 Chevrolet Silverado 2500
- 2008 Chevrolet Silverado 2500
Chevrolet Silverado 3500
- 2007 Chevrolet Silverado 3500
- 2008 Chevrolet Silverado 3500
Chevrolet Suburban
- 2007 Chevrolet Suburban
- 2008 Chevrolet Suburban
Chevrolet Tahoe
- 2007 Chevrolet Tahoe
- 2008 Chevrolet Tahoe
Chevrolet Trailblazer SS
- 2007 Chevrolet Trailblazer SS
- 2008 Chevrolet Trailblazer SS
GMC Yukon
- 2007 GMC Yukon
- 2008 GMC Yukon
Vehicle applications reflect the fitment published by Texas Speed & Performance for this part number. Confirm your engine and cylinder head configuration before ordering.
FAQ
What vehicles does the Texas Speed 4L65E 4WD performance transmission fit?
Texas Speed lists it for 2007 to 2008 four-wheel-drive GM LS cars, trucks and SUVs that use the 15-pin 4L65E case connector. Verify the connector pin count and drivetrain on the original transmission, since the connector changed over the production run.
How much power is the Texas Speed 4L65E rated for?
Texas Speed rates this rebuilt 4L65E for up to 600 rear-wheel horsepower, supported by the 7-clutch GPZ 3-4 stackup, 5-pinion planetaries, heavy-duty sprags, reinforced input drum and upgraded pump pressure.
What is upgraded inside the 4L65E compared to a stock rebuild?
Beyond a complete overhaul kit, the unit gets a 7-clutch GPZ 3-4 pack, heavy-duty sprags, 5-pinion planetaries, a reinforced input drum with billet overrun piston, a wide red 2-4 band, a heavy-duty sunshell, a .500 boost valve pump with High-Rev vane rings, redesigned 3-4 return springs, a heavy-duty shift kit and a Corvette servo with billet 4th apply piston.
Can I manually hold gears with this transmission?
Yes. The rebuilt valve body with heavy-duty shift kit allows full gear-lever-controlled downshifts from 3rd through 1st and lets 1st or 2nd gear be held at any speed or rpm.
What is the difference between the 4WD and 2WD versions?
The internal upgrades are the same. This listing is the 4WD case for four-wheel-drive vehicles; Texas Speed sells the 2WD case separately for the same 2007 to 2008 model years. Order the one matching the vehicle's drivetrain.
Does the transmission come with a warranty?
Yes. Texas Speed provides a 30 day warranty from the time of delivery. The transmission ships in a plain, reinforced double-wall box.
