Down shifting crunches

Took the Duster for its first drive since i bought it and shifted great from 1st to 4th.Then went to stop and down shifting from 4th to 1st and every gear was crunchy going in.I have a centerforce clutch.With the car out of gear and clutch out there is no noise,but as soon as i put it in gear there is a rattling and scrapping noise when i let the clutch out a little.Going in reverse is very noisy but going ahead isnt bad other than the rattling.Car has a modified 318 with 355 sure grip rearend 833 tranny.Any thoughts on this would be greatly appreciated.Thank You David