It has strong lexical similarities to the Hessian dialects and to South Westphalian, which are spoken in surrounding regions.
See Standard German Pferd, Topf, and Apfel, which are respectively rendered in Siegerländisch as Päärd, Döbbe, and Abbel.
t → s - Not entirely complete; 'small' words like das, was, and es consistently retain /t/ in Siegerländisch (hence dat, wat, and et).
d → t - In Siegerländisch, the voiceless alveolar stop is generally unaspirated, so the distinction between the /t/ and /d/ phonemes is less noticeable.
For example, Standard German lieber and Trauben are called leewer and Wingtruweln in Siegerländisch, and the imperative Bleib noch hier!
It is thus difficult and occasionally impossible for native speakers to distinguish them from voiced plosives when they directly precede vowels.