Curl or bunch your tongue without letting the tip touch the roof of your mouth. Brace the sides of your tongue against your upper back teeth, and round your lips slightly.
How to pronounce rod in American English
Americans pronounce rod as RAHD (/rɑd/). You'll hear it in sentences like "I measured the window twice before cutting the new curtain rod".
Now you try.
Record yourself saying "rod" and play it back. The mic stays on your device — nothing's uploaded.
Every sound in "rod".
1 syllable, 3 sounds. Explore each sound's mouth shape and how it's made.
Relax your lips and drop your jaw significantly. The tongue tip lightly touches behind the bottom front teeth and the back part of the tongue presses down a little to create more dark space in the back of the mouth.

Touch the tip of your tongue to the roof of your mouth just behind your teeth. Add vocal cord vibration as you release.

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Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
Releasing the final consonant with a puff of air.
In "rod", the "d" is not released — the articulators get into position but hold without the burst of air. Air stops but there's no release burst — the articulators hold position.

