I assume these are right handed threads ?
I can get them started just a bit by hand,,,but am concerned about stripping the threads on the A arm.
I have the correct socket,,,,and they look to be going in "straight" for the initial thread...

Do I just gently use the socket to screw the ball joint into the A arm ?

Dont want to mess up anything,,,, the ball joint and A arm threads are a bit odd looking compared to the usual style thread I am used to seeing,,,,

thanks for any input....

Yes, they are right hand threads, with the correct socket, just keep tightening them until the ball joint is fully seated. The thread pitch is a bit odd. Key point is to get the ball joint fully seated. Good Luck

Also lube the joint threads to ease installation.

Thanks guys !!!

Lastly the torque spec is 120 ft/lbs for 70 Challengers.

Gentle and Mopar upper ball joints don't usually go in the same sentence from my experience.

The odd looking shallow thread is a kind of a twist in compression fit if I recall correctly. And misthreading or overtightening will more likely result in a cracked A-arm (split radiating from the ball joint hole) than stripping off those threads. Most times I've removed them I needed a three foot pipe on to the 1/2 inch rachet/breaker bar to get them loose. Even with lubricant putting them in will probably feel like a workout.

Get them lined up square, watch closely for them to start to touch seated position, torque as stated, and if they are used A-arms check in a couple days for cracks.

That's my experience, yours may vary.

Buy the new reproductions. They come with all new bushings, new ball joints and are powder-coated and ready to install. You can usually find them for $120 for the pair. I don't think you can buy the balljoints and bushings for that amount.