The invention relates to suspensions for trucks and trailers and to systems for clamping an axle housing to a combination suspension support member and spring in such a way that the axle housing is clamped and compressed uniformly on all four sides whereby there is no appreciable tendency for the axle housing to collapse or become deformed so as to require frequent retorquing of the clamping bolts. The system as shown in figure 10 uses interfitting bottom (7) and top (8) axle housing wraps. The bottom axle wrap (7) has upwardly extending sides (16) engaging opposite sides of the axle housing either directly or against interfitting downward extensions (17) on the top axle housing wrap (8). Vertical clamping bolts (11) cause the upwardly extending sides (16) on the bottom wrap (7) to press inwardly against the sides of the axle housing (5).
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