Yes its very possible! The 200 4R transmission was used in many vehicles. I bet there are torque converter that only stall at 1500 rpm. If people don't know what they're doing and put the wrong parts in then somebody else has to sort it out.
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I've seen this just on the boards a couple of times already. I don't believe any other 200 TC stalls as high as a D5 from the General. And it's easy to have someone who doesn't know just throw in something they have lying around and Bob's your uncle until the next guy gets it.