The injured were shifted to nearby hospitals of Garhshankar and Ropar but two of the critically injured were later referred to PGI, Chandigarh, they said.
Police said the pilgrims were going to the holy shrine of Sri Anandpur Sahib from village Sathiala in Beas.
According to SHO, Garhshankar police station, Kewal Singh, the deceased were identified as Sarbjit Kaur (50), wife of Heera Singh of Bansiala; and Mandeep Kaur (26), wife of Gurvinder of Sathiala in Beas.
When they reached near Shekhowal village, a semi-hilly area, one of the tyres of the tractor-trailer drove over a big boulder leading to the accident.
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