I'm not sure what your are describing is shudder or not. It could be at the RPM level and gear you are talking about but shudder feels like you are driving over a rumble strip or washboard for a few seconds. Is that what your jolt is? A merc V swap will usually stop shudder without the need to replace the TC
There is no limit to what you can acheive if you don't care who gets the credit.