Replaces the bonded valve body separator plate on 2007-08 GM 4L60E, 4L65E and 4L70E units with a TransGo plate and matching gasket set.
If you are pulling the valve body on a 2007 or 2008 Silverado 1500, Sierra 1500, Tahoe, Yukon or Suburban with a 4L60E, 4L65E or 4L70E, this is the plate you need on the bench before the job starts. Those two model years were the first with GM's bonded separator plate, where the valve body gaskets are glued to the steel. Unbolt the valve body and that bonded layer peels, tears or stays welded to the case. It cannot be cleaned up and put back with any confidence. The TransGo 46-PLT-07 (part number TGO46-PLT-07, stamped 46-07) is a loose plate with its own gaskets, built specifically for the 2007-2008 casting, and it ships from the USA.
Every shift in a 4L60E is decided in the valve body, but the separator plate is what routes that decision into the case. It is a flat steel sheet full of feed holes and calibrated orifices sandwiched between the valve body and the case passages. Those holes meter how quickly oil reaches the forward clutch, the 2-4 band servo and the 3-4 clutch, and the gaskets on each side keep neighboring passages from talking to each other. When a gasket tears, oil that should apply a clutch leaks into an exhaust or an adjacent circuit. The solenoids still click and the computer still commands the right gear, but the clutch fills slowly and slips while it does. TransGo describes worn, warped and cross-leaking OEM plates as a cause of poor shift performance after high mileage and heat cycles.
On a transmission that has never had the valve body removed, the plate is seldom the root cause, so start with the electrical side and fluid condition. Our 4L60E shift solenoid symptoms and testing guide walks through the resistance and command checks. If the truck tows or works hard, the Silverado 1500 shift problems guide covers how slipping develops under load. The plate becomes the answer in two cases: shifting went bad right after valve body work, or you are about to do valve body work and need a gasket set that will actually seal. In both, buy the plate up front.
TransGo lists the 46-PLT-07 for all 4L60E, 4L65E and 4L70E transmissions from 2007-2008, except hybrids. It is not for 2006-and-older units, which use non-bonded plates with different hole patterns, and it is not for 2009-2015 units, which take the TransGo 46-PLT-09 separator plate kit. Trucks built near a model-year changeover can carry either style, so lay the new plate over your old one and compare the outline and hole pattern before you commit. If you are unsure, send us the year and VIN and we will check it. The full range of parts for this unit is in our 4L60E transmission collection.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The 2007-2008 plate has its gaskets bonded to the steel. When the valve body is removed the bonded layer usually tears or sticks to the case, and a damaged layer can leak between passages and cause soft or slipping shifts.
Yes. TransGo states the 46-PLT-07 includes gaskets and replaces the GM bonded plate, so you get the plate and both sealing surfaces in one kit.
No. It is made for 2007-2008 only. 2009-2015 units use the 46-PLT-09, and earlier transmissions use a different plate. Compare the hole pattern with your old plate or send us your year and VIN.
Yes. TransGo lists it for all 2007-2008 4L60E, 4L65E and 4L70E transmissions except hybrid units.
Refill with Dexron VI ATF, check the level hot with the engine running, and reset the transmission adaptive values with a scan tool so shift pressures relearn on the new seal.
