Car shudders at anything above 1500 or so rpms. Under that shifts smoothly and dine but have to keep it under half throttle. Thinking its a torque converter. Sound right. Getting the car thurs so curious ahead of time.
Worn Axles or torn control arm bushings can cause wheel movement under load too.
You will have to drive it.
Last time i had a torque convertor issue my car wheel hopped on low speed, hard throttle starts and progressively got worse.