I think snarled is too harsh. Something like "Books," he shook his head, and crawled back underneath the truck.

Also, try this edit:

Jimmy pulled himself out from under the truck, and watched her walk; the sun beamed shadows and haloes around her ass as she strode away.

Both these edits give a new dimension to their relationship, and to the story.

My review has been submitted for consideration in "Good Deeds Get CASH!" .