Overhand bicep curls

[friendlyfireaintfriendly]

Ive been working on my upper body strength a lot more recently recovering from dislocated knee (finally my runnings gone to **** and so has everything) anyway If i was to do a bicep curl with a weight of my own body weight odd would this be about the same as doing a good chinup overhand grasp? Just ive noticed very worrying creaking on my doorframe after 8 chinups

[Chappy]

No I wouldnt have thought so, as the marine style chin ups work the back and lats. A lat pulldown would help using the same grip as if you were doing marine pull ups.

[CrouchmasterT]

Lat pulldown wont help that much. Friend of mine can do well over his bodywieght on the lat pulldown but he can only do 5 undergrasp pull ups and even less overgrasp ones.

I guess you'll have to just find a tree to do them on.

[Woody]

You can always use the 2 chairs and a broom handle and do loads of incline pull ups. They are good for increasing pull up scores.

[Benw]

or you could always put the bar in a different door frame.

[HotShot]

Or if you have a loft, put a shovel handle (or something else which is thick and can support your full weight) across the entrance to it, and use that...that's what I do...

[T T Fresh]

the only real exercise that will help pull-ups is pull-ups. Lat pull down will help because it is an exercise that trains the Latissimus Dorsi (back muscle) which is the main muscle used in pull-ups, and it trains it in the same action. But it won't do in place of it so crouchmasterT is right.
It's a bit like trying to use bench press instead of press ups.

Any back exercise will aid but you'll have to try and find somewhere else to do them - Park climbing frame/monkey bars or even a tree branch.