Running Board Installation

[Mekanic]

My son has a '96 Grand Cherokee and was given a set of Aluminum tubular running boards that will fit this vehicle. Upon looking under the chassis at the frame I did not see any pre-drilled holes for the mounting brackets of the running boards. Would large diameter ( 1/4" to 3/8" )sheet metal screws be sufficient to fasten the brackets to the frame? Or should we try to drill holes in the frame to accommodate long bolts?

Thanks for your advice.

[chris5.2]

hi, when i got my gc93 it had on runing boards held in place by big screws ,they use to shake like crasy . i had to have the brackets welded to the frame , i hope this help .
chris5.2