I`m installing my new headliner in my 83 TA, Its has a PVC backing,
what holds it up. Is there trim I am missing or clips.

 

the sunvison hold up each side, if you have the overhead console it keeps the center up nice by the windsheild.then there is the plastic moulding that goes across the back ot it by the trunk opening. hope this helps.

 

The original headliner had 3 clips in the front that kept it from sagging

These NEVER come out with the old headliner, or at least in one piece.

If you have an overhead console this is not a problem

The liitle plastic bezels for your seatbelts help hold up the sides
as well as the dome light

Make sure your pressure clips for your dome light hold well, if not get new ones.

The other points Rusty Rider stated are correct

I put a PVC headliner in my '84 TA T-top years ago
I since have installed an overhead console to get rid of the sagging in the middle

 

Thanks for all your help guys, I don`t have a overhead console or sunvisors
yet.

 

Some headliners come with velcro that gets placed in the front center to hold that area up.