Trannies Thumbs -

Leo looked down at his "trannies thumbs" and chuckled, a rough sound that ended in a cough. He flexed them, feeling the familiar ache.

"Hand me the pick," he grunted, his voice echoing off the underside of the chassis.

The phrase "trannies thumbs" (or "tranny thumbs") is typically used in automotive enthusiast circles as slang for the that mechanics and DIY car hobbyists get from working on transmissions.

His daughter, Maya, slid the tool toward him. She’d been watching him for three hours, fascinated by the way he moved through the complex web of gears and clutches with the muscle memory of a pianist.

He took a sip of his drink and looked at the transmission—the heart of the machine.