Can you make your own crossmemberbas a flat bar to hold up transmission

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! Using a flat steel bar to DIY a cross-member sounds creative, but it's risky. The transmission cross-member supports a lot of weight and takes on forces as the car moves. If it isn't shaped right or doesn’t have the right strength, it could bend or even fail under load, leading to serious issues. Factory cross members are made to handle the torque and weight with a specific structure and rigidity. For something like this, you’d be better off with an OEM or properly engineered aftermarket crossmember designed to safely handle the load. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.