you can run 35's on an ifs
you will just have to drive it like you know it will be easy to break
light on the skinny pedal especially when the wheels are turned
the cv joint and front axels are the weak point especially when the tbars are cranked
making them run at a greater angle
but my friend has had 35's on his ifs for years and never broke so it really depends on how you drive
and in what terrain. he isn't easy on his truck but he does drive it with the truth in mind
in a straight line the axels are mostly fine but still aren't up to the torque the 35's will make them go through if say you bounce the front end and come down on it spinning. blam broken joint
it's all about the angle of the joint under torque
I watched a guy stuff the one side of his rig and the other started to spin then caugth traction and boom it broke
it broke on the extended side not the stuffed side
but I have seen a rig running around my area for years with 38.5's on an ifs with no breakage.
I know he wheels it some but nothing heavy or hard core cause he don't want to get his street queen dirty
it does look cool with the top chopped off and 38.5's but you can't wheel it like that and not expect to break.
he's one of those street cruisers with the neons and bling bling rims and stuff and everything under it chrome and four hundred speakers in the bed