i know someone selling 4.10s for a d30 and d35 for $100. you would still have to get a new carrier for the 30. i personally wouldnt regear a d35 though.
There was a guy selling an 8.25 w/4.10's a while back, I just looked at it a few days ago and he never said if it sold or not. I think it's on page 2 or 3 now.