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I have a 9380 qaudtrac with 12 spd powershift. It has been running great until one day going across the field it just felt like you hit a wall and it killed the engine. After restarting and attempting to move, I noticed it now has very, very violent clutch pedal engagement. Then just as soon as you shift into 4th gear, it's like you hit a wall again and it will kill the engine if you don't clutch it soon enough. After talking to Jay at Big Tractor Parts, we did the upshift and downshift solenoid test thru all gears with the engine off. Everything seems to be normal. NO error codes. Jay recommend that when I hit 4th gear, to upshift very fast and get past that gear. I was able to do that. Gears 4,5,&6 seem to be the trouble area. Gears 7,8,&9 worked great. Then as soon as I hit gear 10, the engine was immediately killed. It will also kill the engine as soon as you shift into 2nd reverse. I do have a service manual and have done alot of reading. I don't currently have the right fittings to hook up pressure gauges, but I can go get them. Any help would be greatly appreciated. Thanks