@Newpuppyterror our pup hated the car too. Cried and cried and cried. We had her in the boot, not in a crate though.
We decided to take her out in it every day. She got a treat when we put her in, and a treat when we took her out. Just short journeys here and there, but were militant about building up exposure.
It probably took ten days-ish for her to be fine.
We started at 9wks and when she was 11wks we took her up to the Highlands, which was nearly 5 hours. We stopped for wees and a walk, but she managed it all fine, sleeping a lot and chilling out.
She's grand now. Still in the boot, with a bed she lies in.
Good luck!