Is the car sitting alot higher. Do you have a set
of stock shackles to try. Is the rear section of the
spring near the frame rail or does your shackle have
it quite a bit from the rail
EDIT
The book shows the 456 and 457 for 3400LB and B-body

Last edited by MR_P_BODY; 01/16/09 10:47 PM.