A tie bar assembly for use in a vehicle comprising; a housing having a tubular shape disposed about a central axis, a rear unit disposed annularly about said central axis in said housing including a cylindrical rear inner insert and a rear outer insert and a rear web made of elastomeric material and radially interconnecting said rear inserts (32, 30) for allowing axial movement of said rear inner insert relative to said rear outer insert, a front unit disposed annularly about said central axis in said housing including a cylindrical front inner insert and a front outer insert and a front web made of elastomeric material and radially interconnecting said front inserts (38, 36) for allowing axial movement of said front inner insert relative to said front outer insert, a connecting rod disposed along said central axis attached to said rear inner insert and said front inner insert, a pole sub-assembly disposed annularly about said central axis and between said rear unit and said front unit, said pole sub-assembly and said units (28, 40) defining a front fluid chamber extending annularly about said central axis and a rear fluid chamber extending annularly about said central axis, a magneto-rheological fluid contained within said front fluid chamber and said rear fluid chamber, a plurality of fluid orifices disposed through said pole sub-assembly for fluid flow of said magneto-rheological fluid between said front fluid chamber and said rear fluid chamber, said pole sub-assembly having a central bore and said connecting rod slidably disposed in said central bore for causing movement of said magneto-rheological fluid between said front fluid chamber and said rear fluid chamber through said fluid orifices in response to simultaneous movement of said inner inserts (32, 38) in either direction along said central axis, characterised in that it further comprises a front travel cushion integral with said front web and disposed on one side of said front inner insert for limiting the said movement of said front inner insert toward said pole sub-assembly and a rear travel cushion integral with said rear web and disposed on one side of said rear inner insert for limiting said movement of said rear inner insert toward said pole sub-assembly, wherein said units (28, 40) are axially spaced in said housing to define a pole chamber, said pole sub-assembly is disposed in said pole chamber and includes an outer pole member extending annularly about said central axis and an inner pole member extending annularly about said central axis and radially aligned with said outer pole member, wherein said plurality of fluid orifices are disposed between said inner pole member and said outer pole member, said outer pole member includes a front half and a rear half each having a central aperture and defining an annular cavity extending concentrically about said central axis, and it further comprises a bobbin disposed between said outer pole member rear half and said outer pole member front half within said annular cavity, an electromagnet coil disposed on said bobbin in said annular cavity for generating an electromagnetic field to affect viscosity of said magneto-rheological fluid, wherein said front and rear halves (64,66) of said outer pole member define a gap extending radially into said annular cavity, said bobbin extends into said gap and defines seal seats extending annularly and a plurality of O-rings are disposed in said seal seats of said bobbin for preventing said magneto-rheological fluid from leaking into said annular cavity.