Rear Axle Housing -9 in - 58 in Wide - Offset - 5 x 4.5 / 5 x 4.75 - 3 in Tubes - Solid Axles - Steel - Natural -G-Body 1978-88 - Kit. Housing kit fits the 1978-1988 intermediate chassis. Replace a stock 7.5 in. rear-end with the much stronger 9 in. style. Kit includes a new fabricated center section, new axle tubes with large bearing late Torino style-ends, 31-spline axles with bearings and seals installed, drilled for studs with 5 on 4-1/2 in. or 5 on 4-3/4 in. bolt circles. Choose from two widths, 58 in. and 60 in. axle flange to axle flange.