Protects, installs and sizes the torque converter fluid seal ring on the stator support of GM 6T30, 6T40, 6T45 and 6T50 units, 2014 and newer.
If you are overhauling a 6T40 or 6T45 out of a Cruze, Malibu, Equinox, Terrain, Encore or Regal and you want the converter circuit to hold pressure the day it goes back in the car, this is the tool for the one seal ring that usually gets installed wrong. It is the OTC 6743 three-piece set, the equivalent of GM special tool DT-51191, rated by the listing for 6T30, 6T40, 6T45 and 6T50 units from 2014 and newer. It ships as a compact 1.19 lb kit and is made in the USA with global parts.
The torque converter hub rides over the stator support that sticks out of the 6T40 pump. A fluid seal ring on that support separates the converter feed and release circuits, so it has to go on without a nick and end up at the right size. The set handles that in three steps. The protector sleeve covers the sharp edge of the support so the new ring slides on without being cut or rolled. The installer pushes the ring down square and to depth. The sizer then goes over the installed ring and brings it back down to the bore size so the converter hub slips on without shaving it. Skip the sizer and a stretched ring can look fine on the bench and still leak once the unit is hot.
This tool is for the rebuild bench, not for a car that still has its transmission in it. If you are chasing a leak at the bellhousing, confirm where the fluid is coming from first; our 6T40 fluid leak guide covers the converter area, the vent, cooler lines and pan. If the complaint is slip or a TCC code on a unit that has never been apart, read 6T40 common problems and fixes before you pull it, since solenoid and wave plate failures cause similar drives.
The listing fits GM 6T30, 6T40, 6T45 and 6T50 six-speed transaxles, 2014 and newer, and calls it equal to DT-51191. Those years overlap the change to the third-generation pump, which Transmission Digest dates to 2015, so if your unit is a 2014 or earlier build, compare your stator support and ring with your service information or send us the year and VIN and we will check it before it ships.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The listing describes it as the equivalent of DT-51191. It is the OTC 6743 three-piece set: a seal protector, an installer and a sizer.
No. It is the tool set only. Use the ring from your overhaul kit or the correct GM ring for your unit.
It is listed for 2014 and newer 6T30, 6T40, 6T45 and 6T50 units. Earlier units may differ at the stator support, so compare with your service information or send us your year and VIN first.
You can push it on, but you cannot size it. A ring that is left stretched gets cut by the converter hub or leaks once hot, which shows up as converter clutch slip and P0741.
No. The seal ring sits on the stator support inside the unit, so the transmission has to be out and the converter removed. Confirm the leak source first.
