You obviously have no point of reference for the usefullness you seek to achieve. Doing $4000 worth of work to accomplish $500 worth of value is OK if you just need a hobby. But when real value is observed you would know that what you want to do to your engine is waste and what you seek to do to your trans is insignificant. The trans will benefit little with a bandage, whereas the engine is realistically repaired from the top unless you have 350,000 miles on it.

You should take the trans apart and replace all the seals and leave the engine in the car and replace the upper rails and chain, simple job. The end result would be a much more desirable auto

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician