lmodelmack Posted April 7, 2013 Share Posted April 7, 2013 i have a mack 5 speed in my r model and in fifth gear it makes a noise that comes and gose. i also had a 12 speed that did the same thing. i always remove the plugs and clean them and theres no big pieces. has anyone else ever had this problem.. Quote Link to comment Share on other sites More sharing options...
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