Have been told can add 3rd belt in back of ford probe is this true as well as legal?
Answers:
how many times do you want to ask the same question ????
If the car has 3 seats in the rear you should be able to fit a seat belt to the centre seat, but due to fitting constraints these are usually only of the across the lap type belt, and not the diagonal/lap seat belt. Due to the age of the car I should think that this arrangement would be perfectly legal. Before you do anything, just to make sure, I would contact your insurance company and ask them, otherwise you could find that they don't cover this.
The car was designed to carry 4 people, not 5.
The seatbelt mounting points may not be strong enough to take the load of 3 passengers in an accident - they were only designed and tested for the loads from two belts, so a third belt may prevent the other two belts from working properly in an accident.
Also, the car is registered as having 4 seats, and is insured as having 4 seats. If you modify it, the legal certification (Type Approval) it was registered under may no longer apply, making your car non-road-legal, and/or non-insurable.
There is a lot of engineering work (including destructive testing) in determining the correct positioning of the belts relative to the seats, the size of occupant they are designed for, and how the loads from the belts in an accident are borne by the car's structure. Without carrying out all this work, you cannot be sure an additional belt will actually be safe in an accident.
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