clanking noise when going from 1st to 2nd

here is the problem... When going DOWN HILL only and I give a little gas, then let off just before it shifts from 1st to 2nd I hear a clanking noise... The noise comes on just as the car is shifting from 1st into 2nd... again this is only noticeable when going down hill. the noise seems to be coming from directly under the car (toward the middle)

This is an A4 2002 SS Camaro with 30K miles...

Could this be a U-joint problem?

TA arm bolts?

Thanks

Sounds more like u joints

Thanks!

how much should I expect to pay to have them replaced?