Put it in reverse and now its stuck and wont shift. What could cause this

Does the shifter move? Could have popped one or more clips off.

Or is the shifter stuck, like it is jammed?

The shifter moves it will shift into 3rd and 4th but not first and second or back into the reverse position. I removed all the shift rods and the reverse tab and 1st and 2nd tab are both stuck. 3rd and 4th moves freely. Is there a reverse lock out jammed?

Get under thereand see if you can move the lever. Reverse is farthest toward the back of the car on the bottom. Put a crescent wrench on it and try to move it toward the front.

I dont want to force anything and break the tranny

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Put a crescent wrench on it and try to move it toward the front

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I have done this many times.

I used to have to do this frequently with my Cuda (before the TKO swap), and also with a 69 Valiant with a 3 on the tree that I owned in the 80's and 90's. They both had sloppy, worn out shifters, and you could move the shifter out of position without actually moving the levers on the transmission. If you weren't careful, the shifter would slip into neutral without moving the tranny out of the gear it was in. Once the shifter was 'out of position', it wouldn't go into any other gear, including the gear the tranny was in, and there was no way to get it working again without crawling underneath. To get going again, I would make sure the shifter was in neutral, determine what lever on the tranny was in gear, then move that lever into it's neutral position, get back in and drive away. But, make sure you have the emergency brake on or the wheels chocked if you're on any kind of slope so you don't start rolling when you pop it into neutral. As said, a crescent wrench works great to move the tranny levers. A few years before I did the TKO swap, I put a better (less sloppy) shifter in the Cuda, and never had a problem after that.