56" Rear spring hole locations

[adaml23]

Does anyone know how far back from the original spring hanger bracket holes in the frame the new holes need to be? I was doing some searching and found that some frames already had the holes drilled out from the factory for both springs lengths but I unfortunately just realized after I started grinding the rivets out that mine aren't there for the longer springs . So now I need to drill the holes for 56" springs but don't know the measurements. Any help would be appreciated!

 

[adaml23]

FYI I realize the springs are 4 inches longer but didn't know if that's the difference between the holes or if it was a little more or less than 4". Thanks

 

[adaml23]

Anyone? I'm really wanting to put some holes in this frame but don't want to put em n in the wrong spot.

 

[J Knight]

The rear shackle hanger needs to be mounted exactly 4in back from the original 52in spring location.

 

[adaml23]

When drilling the holes, has anyone made them larger (in the hangers as well) to accommodate larger bolts? Is that necessary or should I just use the widest bolts that will fit in the factory size holes in the hanger brackets?

 

[J Knight]

3/8 x1in grade 8 is more than adequate to secure the hangers.