I'm not using vB4, so i'll give Ucash a look. but i doubt it will do much more or different than vBcredits.

What i really need is something even more simple than vB credits.. it just needs to calculate actuvity, & change an image according to the calculations. thats it.!
blank box amount for posts, replies, polls, sign in, referral, etc. and also a blank box for misc where points can be added manually. then based on the total points it adds an image (rank) to thier profile/postbit, etc.

Maybe it is harder than it seems, but im guessing many people would have a use for it.!!

i'll check out Ucash anyway. :)

uCash is rather useless without it's uShop companion, but you don't need that!
Something like vBExperience would work, had a look at it??

Yea im using vBxperience now and it is working, but i would still like a Rank addon or something.
I think it would be very simple to add, but i just dont know anything about creating mods. :(

There's the User Rank manager of vB you can use if you want.