6L50 Shift Kit 2006, 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 the 6L50 six-speed and it pauses before Drive or Reverse takes, then catches with a thump, the cause is often worn pressure regulation rather than burned clutches. This listing is the TransGo SK 6L80 Shift Kit. Do not let the 6L80 name throw you: TransGo builds one SK 6L80 for the whole rear-drive six-speed family and lists it for 2006-on 6L45, 6L50, 6L80 and 6L90. The 2006 in the title is the first year of that application. It is a restore-to-spec repair kit, not a firm-shift calibration. If you want harder, faster shifts for towing, the TransGo 6L80-TOW&PRO kit for the 6L50 is the performance option.
The 6L50 (GM RPO MYB) has no shift valves or accumulators in the old sense. Each shift is one clutch releasing while another applies, timed by the control module on the valve body through pressure control solenoids. That only works if line pressure from the pump's pressure regulator valve, and the regulated oil feeding the solenoids, hold steady. In this family both circuits wear. The pressure regulator valve wears its bore in the pump body, and the solenoid regulator valve wears its bore in the valve body. Leakage there means the module commands one pressure and the clutch sees less, or sees a spike.
The SK 6L80 corrects that without reaming. It supplies a hardened steel pressure regulator valve with longer sealing lands and a red regulator spring, a new boost valve and bushing with a relief that limits line pressure spikes, and a steel solenoid regulator valve in its own bushing. It also has replacement diaphragms and seals for the pressure switches on the control module, and three sealing rings with expanders for pump stators that run rotating rings.
Those codes can also come from worn clutches or a failing solenoid, so treat them as a reason to test first.
Set the fluid level correctly first. The 6L50 has no dipstick on most applications; it is checked at the pan plug with the engine running and fluid between 86 and 122 F, and our 6L50 fluid and level guide covers the procedure. Low or aerated fluid alone causes delayed engagement and flare. Next, gauge line pressure and compare it with the commanded value on a scan tool. Sonnax notes that a flat reading around 60 to 68 psi points to a line pressure solenoid stuck in exhaust, which this kit will not cure. Pressure that drifts, or overshoots on a quick throttle stab, fits worn PR or boost circuits. The 6L45/6L50 limp mode guide walks the code and pressure tests in order.
TransGo's instruction sheet lists the SK 6L80 for 2006 through 2020 units across the family, which covers the 6L50 from its first model year forward. GM uses unique upper valve bodies per RPO (MYA, MYB, MYC, MYD), but this kit only replaces regulator valves, springs and switch seals, so the same kit serves the 6L50 and its siblings. Confirm you have the MYB unit from the RPO code on the vehicle's service parts identification label. If you are not sure, send us the year and VIN before ordering. Other parts for this unit are in our 6L50 collection.
The pressure regulator and boost parts live in the pump, so the transmission has to come out for the full kit. Use the red PR spring together with the original bumper spring; TransGo calls for both. Fit the supplied stator rings only on steel ring grooves with rotating rings, never on aluminum grooves or stators with locking notches. In the valve body, the new gold retainer must sit below the casting face, and the check balls should be measured while it is apart, since undersize balls cause no-forward or no-reverse complaints. If the pump rotor and slide are scored, add a 6L50 pump rotor and slide kit; a valve body with badly worn bores may be better replaced with a remanufactured 6L50 valve body. Refill with DEXRON-VI, set the level at the plug, then clear adaptive values and drive it through every gear to relearn.
| Fits | 6L50 2006 |
| 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.
TransGo makes one SK 6L80 for the GM rear-drive six-speed family and lists it for 2006-on 6L45, 6L50, 6L80 and 6L90. The pressure regulator, boost and solenoid regulator parts it replaces are shared across the four units.
No. This kit restores worn regulating circuits toward factory shift feel. The TransGo 6L80-TOW&PRO is a performance kit that raises maximum line pressure for firmer shifts under load. Pick the restore kit for a daily driver, the TOW&PRO for towing or a modified engine.
Yes for the full kit. The pressure regulator valve, boost valve and stator sealing rings are in the pump. The solenoid regulator and pressure switch parts are serviced at the valve body and control module.
Only when worn regulator bores are the cause. A line pressure solenoid stuck in exhaust, a control module fault or burned clutches need their own repair. Compare actual line pressure to commanded pressure before buying.
DEXRON-VI only, with the level set at the pan check plug at 86 to 122 F with the engine running. Clear transmission adaptive values with a scan tool, then drive through all six gears so the module relearns clutch timing.
