is this engagement normal?

[LNS4x4]

hey guys i am new to diesels, and about 1k miles into my new to me 05 psd. My question is when i take off from a stop at times, I can feel the rear engage somewhat clunky. Its not real harsh, but I can feel it. Is this normal? it only happens every so often when im light on throttle taking off normally. any input would greatly be appreciated.

[purplehorn1977]

it might need the slip yoke greased its a very common problem. just slide it out and grease it. i drilled and tapped mine for a grease fitting ans all has been great since.