Fourth gear bang In my Merc.

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Well-known member
Question, in my mostly stock Y block 56' Merc. automatic when running thur the gears some times it bang hard into hi gear ...I'm afraid to ask.
The ****** operate good other then that .Someone it does and other not .
Thank you for reading.
 
Yum, you have a fourth gear in a '56 automajic?? :eek::eek:

Is it making a banging noise or just shifting hard? Does it happen on acceleration only?
 
hard shifting up or down could be a sticky valve body, put in a can of lucas trans conditioner and see if that helps, i did for me
 
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