Replaces the bonded valve body separator plate on 2009-2015 GM 4L60E, 4L65E and 4L70E units with a TransGo plate and loose gasket set.
On a 2009-2015 Silverado, Sierra, Tahoe, Yukon, Suburban, Express or Camaro with the 4L60E, 4L65E or 4L70E, the valve body separator plate is not a reusable part. GM bonded the gaskets directly to the plate on these late units, and the moment the valve body comes off, that bonding tears or stays stuck to the case. Reinstalling it invites cross leaks that show up as soft shifts, flares and slipping. The TransGo 46-PLT-09 replaces that bonded plate with a stamped steel plate and separate gaskets so the valve body seals on clean, fresh surfaces. Part number TGO46-PLT-09, plate stamped 46-09, ships from the USA.
The separator plate sits between the valve body and the case. Its precisely sized holes and orifices decide where fluid flows, how fast each clutch and the 2-4 band fill, and which circuits stay sealed from each other. The pressure control solenoid sets line pressure and the shift solenoids switch the shift valves, but if the plate or its gaskets leak between passages, that pressure bleeds into the wrong circuit. TransGo notes that high mileage and heat cycles wear, warp and cross-leak OEM plates; this plate restores proper hydraulic function.
If the valve body has not been off, a plate is rarely the first suspect. Scan for codes and check the electrical side first; our guide to shift solenoid codes P0753 and P0758 covers the circuit checks. Where this kit earns its place is any job that removes the valve body: a solenoid replacement, a shift kit install, or a rebuild. Once the bonded plate is disturbed, budget for a new one. If shifts went bad after previous valve body work, a torn bonded gasket is a prime suspect; the 4L60E harsh shift causes guide helps separate that from pressure control faults.
The 46-PLT-09 fits GM 4L60E, 4L65E and 4L70E transmissions from 2009 through 2015. It does not fit earlier units: TransGo makes separate plates for other year groups, and 2007-08 transmissions take the TransGo 46-PLT-07 plate and gasket kit. Compare the 46-09 stamping with your plate's shape and hole pattern before anything goes back together, and if your transmission build date sits near a model-year change, send us the year and VIN. More options are in our 4L60E parts collection.
Drop the pan and filter, unplug the internal harness, and pull the valve body with the plate held against it so the checkballs stay put. Scrape the case and valve body faces clean without gouging them, and check they are flat. Install the case-side gasket, the plate, then the valve-body-side gasket, confirm every checkball is in its pocket, and torque the valve body bolts in sequence to factory spec. TransGo notes this plate requires snap filters for the EPC and shift solenoids, since the bonded plate's screens are gone; have them on hand. With the valve body off, it is the right time to fit new shift solenoids A and B or the TransGo SK 4L60E shift kit. Refill with Dexron VI, check the level hot, and reset adaptive learn.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Not reliably. On 2009-2015 units the gaskets are bonded to the plate and tear or stick to the case when the valve body is removed. A damaged bonded gasket can cross-leak and cause soft or slipping shifts.
Yes. TransGo states the 46-PLT-09 includes gaskets. Some of TransGo's earlier-year 4L60E plates are sold without gaskets, but this 2009-2015 plate is not one of them.
The original bonded plate carried screens that protect the solenoids from debris. TransGo notes this plate requires snap filters for the EPC and shift solenoids. Install them so debris cannot reach the solenoids.
No. The 46-PLT-09 is for 2009-2015. For 2007-08 4L60E family units, use the TransGo 46-PLT-07 plate and gasket kit.
Refill with Dexron VI ATF, check the level hot with the engine running, and clear transmission adaptive values with a scan tool so the computer relearns shift pressures.
