I have the 2338 4 jaw from LMS. I assume you mean you have a 7x lathe? I got it for my LMS 8x20 lathe. My lathe has electronic braking. With the 3” 3-jaw it stops fast but the 5” 4-jaw it takes a few revolutions then it stops.
This 4 jaw is a solid chuck. The jaws are mounted tight in the slots and the pinions are tight in the keepers as well. You’ll be happy with this chuck.
Just a recemendation, I’m pretty sure that the backing plate will have a 3 hole pattern and a 4 hole pattern as it is somewhat universal and you will have to drill holes to mount the chuck. Check with LMS on that to make sure. If you do have to drill additional holes, I recommend that you fill the unused holes with steel slugs. I didnt at first and I had a vibration at 600-700 rpm’s. I loctite 638’d the slugs in place and the vibration is gone.
This 4 jaw is a solid chuck. The jaws are mounted tight in the slots and the pinions are tight in the keepers as well. You’ll be happy with this chuck.
Just a recemendation, I’m pretty sure that the backing plate will have a 3 hole pattern and a 4 hole pattern as it is somewhat universal and you will have to drill holes to mount the chuck. Check with LMS on that to make sure. If you do have to drill additional holes, I recommend that you fill the unused holes with steel slugs. I didnt at first and I had a vibration at 600-700 rpm’s. I loctite 638’d the slugs in place and the vibration is gone.