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My transmission used to be pretty smooth, and I assumed all these crunchy shifts people talked about were operator error.
Then I lost an engine when the oil pump gear came apart and had it replaced under warranty.
When they put it together at the dealer, the transmission immediately felt different. It was the exact same transmission (it never left the car when the engine was out), but now gears 3 and 5 are crunchy on downshifts and 6th gear whines on the highway. The tech at my dealership rode with me, listened to the crunch downshifting into 3rd and said it's "normal" for the transmissions Subaru uses.
That was nearly 40K miles ago. Transmission is still crunchy, but it hasn't gotten any worse.
So I suspect--although I have no real evidence to support it--that there's something going on with the way the transmission is mounted in relation to the engine. Something isn't aligned 100% perfectly, or something is torqued slightly crooked to put stress where it shouldn't be. There's no other way I can think of to explain why my transmission would be silky smooth with one engine and crunchy after being unbolted and bolted back up to a different engine.
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