- 1). View the transmission pan by going under the vehicle, if still installed, or by turning the transmission over, to view the bottom. The transmission is in the middle of the vehicle and the best access is to go under the vehicle from either the driver's or passenger's side door.
- 2). Notice the shape of the transmission pan. According to 442.com, the THM-200-4R has an unusually-shaped pan that almost looks like two separate pans, with a main pan and a smaller pan towards the rear. The shape is essentially rectangular with an angle on the passenger's side rear of the pan. This shape is different from all other GM automatic transmissions.
- 3). Look at the bottom of the transmission pan. According to 442.com, the bottom of all THM-200-4R transmission pans are stamped on the bottom with the word "M E T R I C."
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