6L90 Shift Kit, new and ready to install. Fits the 6L90. Ships fast from the USA.
If your 6.0L Silverado 2500 or Sierra 2500HD, an Express or Savana van, or a supercharged Camaro ZL1 or Corvette with the 6L90 has started to shift soft and lazy under a load, or you are rebuilding one that already burned clutches, this is the part that addresses the cause instead of the symptom. It is a new TransGo valve body reprogramming kit for the GM 6L-series six-speed, the same family that covers the 6L45, 6L50, 6L80 and 6L90. TransGo lists its 6L reprogramming kit (sold as 6L80-TOW&PRO) for 2006-on units, and that is the kit shown in the photo.
The 6L90 has no bands. Every shift is one clutch releasing while another applies, and the TEHCM sets the pressure for each of those clutches through variable bleed solenoids that feed individual clutch regulator valves in the valve body. When those regulator and boost valves and their bores wear, the pressure that actually reaches the clutch falls short of what the computer commanded, the shift stretches out, and the clutch slips while it heats up. TransGo says this kit reworks the 2-6, 3-5-R and 4-5-6 clutch regulator and boost valve circuits, raises maximum line pressure, and uses a steeper pressure curve so pressure comes up faster when you add throttle. The goal TransGo states is factory feel at light and medium throttle with firmer, quicker shifts and more holding capacity as you get closer to wide open, without software changes for the base kit. That is exactly the window where a heavy truck pulling a trailer cooks its clutches.
A kit only helps if the hard parts and electronics are healthy. Scan for codes and look at commanded versus actual gear ratio during the bad shift. Check fluid level hot and look for a twisted cooler line, which GM documents in bulletin 22-NA-182 as a cause of harsh shift, flare and overheating on low-mileage trucks. If line pressure never rises, or a single clutch circuit sets a stuck-off code, work through our 6L90 shift solenoid symptoms and testing guide and the Silverado 2500 shift problems guide before buying. Worn boost valve bores can be confirmed with a vacuum test on the disassembled valve body.
This kit is for the GM 6L90 (RPO MYD) used in 2007-2020 Chevrolet Silverado 2500/3500 and GMC Sierra HD with the 6.0L gas engine, Chevrolet Express and GMC Savana heavy vans, and the Camaro ZL1 and Corvette Z06/ZR1. TransGo lists the same kit for the 6L45, 6L50 and 6L80, so one kit covers every year of the family. Valve bodies did change over the run, so if your unit has been converted or has an aftermarket valve body, send us the year and VIN and we will confirm. See every part we carry for this unit on the 6L90 parts page.
For the bigger picture on which failures bring these units in, read our 6L90 common problems and fixes.
| Fits | 6L90 |
| Part type | Shift Kit |
| Condition | New |
| Brand | TransGo |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. TransGo lists its 6L reprogramming kit for 2006-on 6L45, 6L50, 6L80 and 6L90 transmissions. This listing is for 6L90 trucks and vans, but the same kit covers the whole family.
Not for the base kit. TransGo states the firmer shifts come from the hydraulic changes alone. Their optional street features, like tire-chirping 1-2 and 2-3 shifts, need HP Tuners or EFI Live. After the install, reset adapts and run the Service Fast Learn.
Plan on removing it. The kit includes pump components, and the 6L90 pump is built into the bellhousing, so you need the transmission out to do the pump portion correctly.
No. A reprogramming kit prevents slip by getting pressure to the clutches faster, but it cannot restore burned frictions. If the unit already slips, rebuild it with new clutches and install the kit during the rebuild.
Dexron VI ATF. Do not mix in universal or older Dexron III fluids.
