GFX has introduced a new pressure switch assembly for Allison transmissions. The pressure switch assembly (part no. 29549658) covers Allison medium- and heavy-duty applications, including models MD B400 and 3000/T200 series and HD B500, 4000, and RDS/T400 series. According to the company, the product is designed to replace OEM part no. 29549658 for all model years.