It sounds like someone put a set of homemade and not well made helper springs on it. If they are welded on just have them cut off and then clean up the scabs that are left. You may end up replacing the stock springs as they may be so worn out that they won't hold the truck up level.

edited 1/3/09: One thing that no one considered at the time of the post is how you intend to use the truck. If you intend to use it to haul heavy loads or tow a heavy trailer the bigger .springs may be the way to go. If you are building it as a driver/cruiser that will occasionally haul a load I'd go with new springs close to load capacity of the original spring specs.
There are plenty of vendors who can sell you new springs with a rating that will fit your needs

Last edited by Mr48chev; 01/03/09 01:41 PM. Reason: Afterthought

1948 Chev pickup.