4L70E Pump 2006, used and ready to install. Fits the 4L70E. Ships fast from the USA.
This is a used OEM front pump for a 2006 GM 4L70E, the first model year that badge existed. It suits owners of 2006 Silverado, Sierra, Tahoe, Yukon and Trailblazer SS models whose transmission has started engaging slowly, slipping across every gear when warm, or throwing input speed sensor codes after a pump-area failure. It is an original GM casting rather than a rebuilt one, which keeps the cost down for a builder who wants the correct factory pump for an ISS-equipped unit.
Like every pump in this family, it is a vane-type pump driven by the converter hub, and its pressure regulator sets the line pressure that applies all the clutches and the band. The 2006 version carries extra jobs. ATRA's 2005 GM update lists the changes GM made to fully implement the input speed sensor for 2006: pump casting revisions that relocated the S3 bore boss and the TCC release bore, updated stator support sleeve passages, and a turbine shaft with reluctor teeth for the sensor. The sensor itself mounts on the back of the pump. That makes this pump part of the speed-sensing system, not just a pressure source.
Start with the cheap checks: fluid level, fluid condition and a line pressure gauge. If ISS codes are the complaint, do not condemn the pump yet. Transmission Digest documents ISS wiring that slips out of its brackets on the back of the pump and gets cut by the reverse input drum, and a lost sensor ground inside the TCM that can be repaired externally. Transmission Digest also traces vent leaks after overhaul to a missing ISS O-ring or retaining bolt, because the sensor and vent passages connect in the pump. Our 4L70E pump failure guide and common problems guide lay out the full test order.
Listed for 2006 4L70E units. Some 2006 4L65E transmissions were also built with the ISS-capable pump while others were not, so the badge alone does not settle it. Compare your old pump: the ISS bore and sensor bracket, the converter feed hole position, and your stator and turbine shaft style must all agree. A late pump with an early stator will build a unit that will not charge the converter. If your core has no ISS provision, the 2005 pump is the closer match. Our 4L65E vs 4L70E guide explains the split, and the 4L70E collection lists other pump years. Send us your year and VIN if you want us to check.
| Fits | 4L70E 2006 |
| Part type | Pump |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It can, if your 4L65E was built with the ISS-capable hardware. GM phased the sensor in, so 2006 4L65E units vary. Check your old pump for the ISS bore and match the stator and turbine shaft style before installing.
Indirectly, yes. The input speed sensor mounts on the back of the pump, and its harness can be damaged by the reverse input drum if it is not secured in its brackets. Check wiring and the TCM ground before replacing parts.
On the 4L70E the ISS passage and the vent passage connect in the pump. Transmission Digest traces vent leaks to a missing ISS O-ring or retaining bolt, so confirm both are installed.
A used OEM pump keeps the correct factory casting at a lower price. Inspect it before installation: check the bushing, the rotor pocket and slide for scoring, and fit new seals. If you need a ready-to-install rebuilt unit, compare the other pump years in our collection.
DEXRON-VI. Prime the pump with it before startup, then set the level hot, in Park, with the engine running.
