A driveshaft assembly (100, 200, 400, 700, 800) comprising: (a) a tubular shaft (104, 204, 404, 704, 804) comprising: (i) at least a first receiving end portion (110, 210, 410, 710, 810) with an opening disposed therein, wherein the receiving end portion (110, 210, 410, 710, 810) has a receiving end portion inner diameter, (ii) a center portion, wherein the center portion has a center portion inner diameter, and (iii) a hollow interior with a shaft inner surface, (b) a driveshaft end component (108, 208, 408, 708, 808) comprising an insert end portion (164, 262, 464, 766, 868) and an attachment end portion; and (c) an annular anti-fretting spacer (106, 206, 406, 706, 806) comprising: (i) a first outer diameter, wherein the first outer diameter of the spacer (106, 206, 406, 706, 806) is substantially equal to the receiving end portion inner diameter (ii) a second outer diameter, and (iii) an outer surface, wherein at least a portion of the outer surface is in contact with the shaft inner surface, wherein the spacer (106, 206, 406, 706, 806) is disposed on the insert end portion (164, 262, 464, 766, 868) of the driveshaft end component (108, 208, 408, 708, 808), wherein the insert end portion (164, 262, 464, 766, 868) of the driveshaft end component (108, 208, 408, 708, 808), including the spacer (106, 206, 406, 706, 806), is disposed within the receiving end portion (110, 210, 410, 710, 810) of the tubular shaft (104, 204, 404, 704, 804) with an interference fit, and wherein the tubular shaft (104, 204, 404, 704, 804) is rigidly coupled to the driveshaft end component (108, 208, 408, 708, 808) wherein the tubular shaft (104, 204, 404, 704, 804) further comprises: (a) the at least a first receiving end portion (110, 210, 410, 710, 810) further comprising a receiving end portion outer diameter, and (b) at least a first terminus with a thickness equal to the difference between the receiving end portion inner and outer diameters (120, 130); and wherein the annular anti-fretting spacer (106, 206, 406, 706, 806) further comprises: (i) a first inner diameter, (ii) a second inner diameter (iii) an inner surface, (iv) a wall disposed between the inner and outer surfaces (140, 142), (v) a spacer interior, (vi) a first opening to the interior, and (vii) a second opening to the interior, characterized in that the first inner diameter of the spacer (106, 206, 406, 706, 806) differs from the second inner diameter of the spacer (106, 206, 406, 706, 806). (a) a tubular shaft (104, 204, 404, 704, 804) comprising: (i) at least a first receiving end portion (110, 210, 410, 710, 810) with an opening disposed therein, wherein the receiving end portion (110, 210, 410, 710, 810) has a receiving end portion inner diameter, (ii) a center portion, wherein the center portion has a center portion inner diameter, and (iii) a hollow interior with a shaft inner surface, (i) at least a first receiving end portion (110, 210, 410, 710, 810) with an opening disposed therein, wherein the receiving end portion (110, 210, 410, 710, 810) has a receiving end portion inner diameter, (ii) a center portion, wherein the center portion has a center portion inner diameter, and (iii) a hollow interior with a shaft inner surface, (b) a driveshaft end component (108, 208, 408, 708, 808) comprising an insert end portion (164, 262, 464, 766, 868) and an attachment end portion; and (c) an annular anti-fretting spacer (106, 206, 406, 706, 806) comprising: (i) a first outer diameter, wherein the first outer diameter of the spacer (106, 206, 406, 706, 806) is substantially equal to the receiving end portion inner diameter (ii) a second outer diameter, and (iii) an outer surface, wherein at least a portion of the outer surface is in contact with the shaft inner surface, (i) a first outer diameter, wherein the first outer diameter of the spacer (106, 206, 406, 706, 806) is substantially equal to the receiving end portion inner diameter (ii) a second outer diameter, and (iii) an outer surface, wherein at least a portion of the outer surface is in contact with the shaft inner surface, (a) the at least a first receiving end portion (110, 210, 410, 710, 810) further comprising a receiving end portion outer diameter, and (b) at least a first terminus with a thickness equal to the difference between the receiving end portion inner and outer diameters (120, 130); and wherein the annular anti-fretting spacer (106, 206, 406, 706, 806) further comprises: (i) a first inner diameter, (ii) a second inner diameter (iii) an inner surface, (iv) a wall disposed between the inner and outer surfaces (140, 142), (v) a spacer interior, (vi) a first opening to the interior, and (vii) a second opening to the interior, characterized in that the first inner diameter of the spacer (106, 206, 406, 706, 806) differs from the second inner diameter of the spacer (106, 206, 406, 706, 806). (i) a first inner diameter, (ii) a second inner diameter (iii) an inner surface, (iv) a wall disposed between the inner and outer surfaces (140, 142), (v) a spacer interior, (vi) a first opening to the interior, and (vii) a second opening to the interior, characterized in that the first inner diameter of the spacer (106, 206, 406, 706, 806) differs from the second inner diameter of the spacer (106, 206, 406, 706, 806).