A mounting bracket is attachable to a vehicle frame for pivotally connecting a booster axle assembly comprising a pair of spaced arms, each arm having a first end, a second end, and an axle connected therebetween. The mounting bracket includes a U-shaped portion having a base and a pair of spaced legs connected to the base and extending in a first direction generally normal to the base. The pair of spaced legs and base define a space for receiving the first end of one of the arms of the booster axle assembly. Each leg defines first and second spaced appendages that define a slot. A mounting plate is connected to the base of the U-shaped portion and extends in a second direction normal to the base to permit connection of the mounting bracket to the vehicle frame.