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Old 08-09-2010, 12:00 PM
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Seat / Shoulder Belt Installation on a 47 Plymouth

Hello folks,

We just acquired a 47 Plymouth two-door coupe street rod, and we're having a blast!

The previous owner installed seat/shoulder belts for the front seats. It appears that the mounting location for the belt retractor was chosen because of the proximity to a frame member, but it makes it VERY difficult to climb into the back seat, not to mention the fact that the belts do not operate very smoothly due to the extreme angle from the retractor up to the pivot point on the "B" pillar.

Does the retractor and belt have to be bolted to a frame member, or, without compromising safety, can it be mounted somewhere else, i.e. to the floorboard, with the use of steel reinforcing plates?

Are there any general guidelines for installing seat/shoulder belts in a vehicle that didn't come with them from the factory (in other words, no factory installed mounting points)?

Thanks in advance for the information!

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Old 09-10-2010, 08:22 PM
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Never fasten the seat belts to the frame, should you be in an accident and the body comes loss form the frame, the seat belt could cut you in half, well maybe not but you get the idea. A good solid plate under the floor is better.
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Old 09-12-2010, 08:49 AM
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I've seen that happen on a race car, but can't remember ever seeing an accident with a street car (particularly an old car) where the body became separated from the frame.

On those old cars, with heavier metal, plates under the floor should be fine.

I don't know what the relationship is between the B pillar and the rear of the door opening/seat back, on your car. I'd think mounting the shoulder harness up higher or lower on the B pillar might ease entry to the back. You probably wouldn't have any problem, no matter where on the pillar you mounted to. The metal there should be plenty heavy. And, you'd be pulling at right angle to the retaining bolt, so that should be stronger too.
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