New transmission and a loss of power

2005 SUBARU FORESTER
200,000 MILES • 4WD • AUTOMATIC
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NIKKI249
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Background: The engine was replaced maybe three years ago (has around 14,000 miles on it) and I just recently had a new automatic transmission put in. Originally when the transmission went out around five months ago I attempted to have someone replace it for me at home with a transmission we found off a crashed Subaru. It did not work because it was not the same year. So we tried to fix the original transmission and put it back in. It would make it around the block and then the all wheel drive would trip out and the car would slip gears and then stop. Then three months later I took it to an actual mechanic and they swapped it with a new transmission from Subaru, however the second I drove it off the lot it would slip hard between gears. So I took it back in. They replaced it again and it is now my current transmission.

The problem now is that it slips slightly when speeding up and I have noticed she does not have the power or speed that she used to have. I am not sure if it is a transmission issue again or if there is another part that I need to replace because everything but the engine and transmission are original to the car.
Jun 21, 2018 at 11:13 PM
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STRAILER
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It sounds like you have a turbine shaft speed sensor that is out on the transmission but we should run the codes first to see what comes up. Here is a guide to help you:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.

Cheers, Ken

Jun 23, 2018 at 1:14 PM