4WD Arduino Controlled car - Problem with motor shield

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SmplFcts
I've been working with what will be a small Arduino 4WD controlled car, however now I've found a problem.
The motor shield I used is an Arduino UNO motor shield R3, v3, which means that it can only control 2 motors, howerver I'll be using 4. Is there any way to use this same shild but apply all 4 motors or will I have to buy a new shield?
If so, any recommendations?
Thanks
 
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Welcome to PF.

It depends on how the steering is done. If it is skid-steer, you might connect the two motors on the LHS in parallel and run them from one control channel. Connect the two on the RHS in the same way to the other channel.
 

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