The INVINCIBLE (Level 3) 4L60E Our INVINCIBLE series features all the components of our Level 2 (Pro Race) transmissions with these upgrades for added Strength and Durability. (Nothing but the best): OEM five (5) pinion planetaries with a grooved sun gear for improved lubrication. Line pressure booster kit 4L60E-LB1 fits early-style GM 4L60-E, 4L65-E and 4L70-E pumps. Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together to provide progressive pressure increases as driving conditions become more demanding. Sonnax Sure Cure kit SC-4L60E is a comprehensive reconditioning package for GM 4L60-E, 4L65-E and 4L70-E PWM units featuring the best Sonnax products developed to help rebuilders restore and enhance transmission performance. Sonnax Transmission Company HP-4L60E-01 - Sonnax Shift Improver Performance Packs Shift Improver Performance Pack, 4L60E, 4L65E, 4L70E, Buick, Chevy, GMC, Oldsmobile, Pontiac, Kit.
A shift kit is a great way to improve the performance of your 4l60e transmission, but there are a number of things to consider before installing one. When most people think of installing a shift kit, they have the notion that their car will have violent and jarring shifts. While this can be achieved if you desired, the fact of the matter is that a shift kit in your 4l60e will not only benefit you, but improve the way the transmission works.
Sonnax 4l60e Performance Pack
What Does A Shift Kit Do For A 4l60e?
Adding a shift kit to your 4l60e equipped car, truck, or SUV will help correct and improve the lazy shifting that the 4l60e is somewhat known for in factory form. Properly installed shift kits will make all shifts more firm and quick without making it feel like you got hit by a train. Similar to a corvette servo upgrade, this may help prolong your transmission’s lifespan by reducing the amount of slip between shifts. This is highly recommended in performance or towing applications.
Sonnax 4l60e Input Drum
What’s the Best Shift Kit For A 4l60e
With how common the 4l60e is and the popularity of retrofitting classic cars with modern transmissions, there are a number of 4l60e shift kit options.
The most popular 4l60e shift kits include:
TransGo 4l60eHD2
TransGo is arguably the leader in the shift kit game, and rightfully so. Their kits are extremely high quality and produce reliable results without breaking the bank. The kit includes all the parts you’ll need for a few different transmission shift improvements ranging from an upgraded stock feel to what users may call a race oriented feel.
The TransGo 4l60e HD2 has complete instructions for the DIY user that are easy to follow.
TransGo HD2 4l60e Shift Kit Reviews
Sonnax Performance Pack
The Sonnax Performance Pack (HP-4l60e-01) is more of a “shift improvement” kit as opposed to a traditional shift kit. However, this does not mean it is any less effective. The Sonnax Performance Pack is a great upgrade for any heavy duty or performance oriented vehicle. All of the components in the HP-4l60e-01 Performance Pack work in conjunction to fine tune transmission line pressures, accumulator and shift calibration.
Overall, the Sonnax Performance Pack is a great way to improve the performance of your 4l60e with quicker, more firm shifts under any load.
When it comes to installing a shit kit in your 4l60e, it can be tricky for someone whos never done the install before. While there are detailed instructions, things can still be confusing. However, there are plenty of guides and resources available to help you correctly install your shift kit.
There are various components that can be used to make the kit work differently depending how you set it up.
This video does a great job of going over the TransGo HD2 kit, and how to properly install it in your 4l60e.
Sonnax 4l60e Servo
While the purpose of a shift kit is to improve how firm the shifts are, there is the potential for “harder” shifts. A high quality kit will improve the shift feel without making a harsher shift. However, there are kits out there that will make the transmission shift very hard, almost too hard. These kits may do more harm than good, so be sure to do your research before buying or installing a shift kit.
Since a shift kits purpose is to have quicker, more firm shifts, a transmission in a race oriented application may make the car quicker with a properly calibrated and installed shift kit due to the reduced delay of the shifts.
A shift kit is designed to improve the shifts your transmission makes, but there is a risk that a shift kit that’s improperly installed may hurt your transmission. However, a properly installed and calibrated shift kit will do no direct damage to your transmission. Your right foot on the other hand…that might hurt your transmission over time.
Shift kits can have various feelings, but the commonality of all shift kits is a more crisp feeling shift. Some kits may feel like you’re being hit by a train during a shift, and others just take the “laziness” out of shifts.
Installation of a shift kit in your 4l60e can vary depending on your skill level and experience. For a professional who deals with the 4l60e on a regular basis, installation can take an hour or 2. For the average DIY weekend warrior, installation can take anywhere from a few hours to all day. Depending on your mechanical ability and familiarity with transmission internals, a shift kit installation my be something you let the professionals do for for you.
If your transmission has any slipping issues before installation of a shift kit, odds are that there are other issues at hand. A shift kit will not directly fix a slipping transmission that has pre-existing issues such as work out clutches.
Description
The INVINCIBLE (Level 3) 4L60E
Our INVINCIBLE series features all the components of our Level 2 (Pro Race) transmissions with these upgrades for added Strength and Durability. (Nothing but the best):
OEM five (5) pinion planetaries with a grooved sun gear for improved lubrication.
Specially prepared performance input drum assembly with reinforcement collar.
Molded seal steel pistons.
Raybestos carbon composite forward friction plates.
A set of 8 RAYBESTOS STAGE 1 PERFORMANCE clutches with new Raybestos steel plates for High Impact Durability and Super Hold on the 2-3 shift.
Borg Warner 29 Element dual cage sprag assembly, the strongest available.
The SONNAX SMART SHELL to eliminate stripping of the splines and breakage common in the factory sun shell, which causes no reverse/second/fourth gears. This piece is balanced to lower drive train vibrations.
Sonnax 4l60e Kit
Ultra wide carbon composite 2-4 performance band with reinforced pin area to prevent tear through. This band will take the abuse and the heat.
Sonnax 4l60e Output Shaft
The SONNAX billet second gear servo for maximum second gear hold (It also limits 3rd gear 3-4 clutch accumulation to aid in the 3-4 clutch apply)
Sonnax Dual Piston Overdrive Servo (with the wide band to stand WOT overdrive if your PCM is set up to allow it)
A Thirteen (13) vane pump with hardened rings and a full-time lube modification, which assures maximum planetary life and cooling. Max line pressure is set at approximately 220 psi .
PerformaBuilt custom shift kit, a compilation of what we consider to be the best of several known kits and some unique modifications of our own.
Deep OEM pan and performance filter .
This unit also features many other proprietary modifications for performance and durability which help it achieve its unbelievable horsepower capabilities. It will take whatever you dish out and we guarantee it. You won’t find a better unit anywhere.
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