Well all you can really do is not put anything back that looks like it is worn (if you are unsure measure it)... and not put anything back the wrong way round!

I mean anyone who is doing the job needs to do the physical "mechanics" of the job before the tests - you've done 95% of the work you just haven't verified it. This isn't a problem if you are about to fit the transmission back in the car you can do tests on installation to verify your work but if you are selling it on there's an element of risk.

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!