6L50 Shift Kit, new and ready to install. Fits the 6L50. Ships fast from the USA.
If your Cadillac CTS, STS or SRX, V6 Camaro, or four-cylinder Colorado or Canyon has started to shift soft and slow when you lean on it, or you are rebuilding a 6L50 and want the clutches to live longer than the last set did, this is the hydraulic side of that fix. The kit on this page is a new TransGo 6L80-TOW&PRO Reprogramming Kit. The part number says 6L80, but TransGo builds it for the whole GM six-speed rear-drive family, and its application line reads 2006-on 6L45, 6L50, 6L80 and 6L90. That makes it a direct fit for the mid-size 6L50 (RPO MYB).
The 6L50 has no shift valves or accumulators in the old sense. It shifts clutch-to-clutch: the TEHCM on the valve body fires pressure control solenoids, and each solenoid signal moves a clutch regulator valve that feeds one clutch while another releases. How firm a shift feels depends on how fast those regulator valves let pressure build, and how much line pressure the pump and regulator can supply behind them. The 6L50 runs a smaller sump than the 6L80, so heat and fluid turnover work against it.
TransGo says this kit raises maximum main line pressure and uses a more aggressive pressure curve, with valve body and pump parts calibrated to keep factory shift feel at light and medium throttle and then firm the upshifts progressively toward wide open throttle. It reworks the 2-6, 3-5-R and 4-5-6 clutch regulator and boost valves for faster, cleaner shifts with more holding capacity, and it needs no software tuning. In short, it is the towing and performance kit, not the base restore kit. On a stock-power CTS it will feel nearly the same around town and noticeably crisper when you floor it.
Be honest with yourself about the last point. A shift kit firms up a healthy hydraulic system. It does not seal a worn valve body bore, replace a failed solenoid, or fix a TEHCM fault.
Scan for codes first. Propulsion and pressure-switch codes on this family are often electrical, and ATRA has documented a defective capacitor inside some 2018 model year TEHCMs that causes symptoms that come and go with temperature. Our 6L45/6L50 limp mode guide walks through the code-reading order and the line pressure tests Sonnax publishes for this family. If you see harsh shifts rather than slipping, read the six real causes of a harsh 6L80 shift; the valve body is shared in design, so the same logic applies to the 6L50. A pressure control solenoid that sticks will mimic a worn regulator valve, and the 6L45/6L50 pressure control solenoid is cheaper to rule out first.
TransGo lists this kit for 2006-on 6L45, 6L50, 6L80 and 6L90 units, so any model year of 6L50 is covered. The 6L50 went into the Cadillac CTS, STS and SRX, the V6 Camaro and the four-cylinder Colorado and Canyon. One catch: upper valve bodies on this family are unique by RPO code (MYA, MYB, MYC, MYD), and GM has a bulletin on the no-reverse, no-second complaint that follows installing the wrong one. The kit goes into your own valve body, so it does not change that, but it is a reason to confirm you really have the MYB before you order other parts with it. Check the RPO code on the glove box label or send us your year and VIN. See every part we stock for this unit on the 6L50 parts page.
This is a valve body and pump job. Drain the fluid, drop the pan and filter, unplug the TEHCM and lift the valve body and module out as one assembly. Lay out each valve, spring and plug in order on a clean tray, because the 6L50 bores look alike and the kit's instructions name each one by location. The pump-side parts mean the pump has to come out, so this kit fits most naturally into a rebuild. If the clutches are already glazed, pair it with a fresh 6L50 friction clutch module rather than asking more pressure to save worn plates. Refill with DEXRON-VI only and set the level hot at the level control plug; our 6L50 fluid and capacity guide has the temperature window. Finish with a Service Fast Learn using a scan tool before the vehicle drives away, since GM calls for it after any valve body or internal service.
| Fits | 6L50 |
| 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's application for the 6L80-TOW&PRO is 2006-on 6L45, 6L50, 6L80 and 6L90. The four units share the same valve body layout and valve names, so the same regulator and boost valve changes apply to the 6L50.
TransGo calibrates it to keep factory shift feel at light and medium throttle and firm the upshifts progressively toward wide open throttle. Expect normal driving to feel close to stock and full-throttle shifts to be quicker and firmer.
No tune is required. TransGo states the kit produces its firmer shifts without software tuning. You do need to run a Service Fast Learn adapt with a scan tool after the valve body work.
The valve body parts can be reached through the pan, but the kit also includes pump components, and the pump is only accessible with the transmission out. Plan it as part of a rebuild or a transmission removal.
DEXRON-VI. Do not use DEXRON-HP, which GM specifies for its newer eight- and ten-speed units. Set the level at the level control plug with the fluid at the correct temperature.
Only if the clutches and valve body bores are healthy. Burnt clutches, a stuck pressure control solenoid or a TEHCM fault will still slip with the kit installed, so test line pressure and read codes first.
