How do you measure for the front spring? The speedway catalog says to measure centerline of perch bosses..........then deduct 4.5 inches..... My ? is my upper spring perch mount is further apart than the perch bosses.... They are connected to the wish bones and swan outward...The other thing is the upper perch mounts are for a 2 inch wide spring .. Hope this made some sense...... HELP
Ideally,the size of a production spring would have been considered when attatching the perches to the 'bones. A few minutes with a grinder should narrow up the perches to accept a 1 3/4" spring.
Speedy bill sez, measure the distance between perch boss holes ,on the axle. Then deduct 4 1/2 " thats the length of mainleaf you need. When building the project poor boy, we used '35 and up ford bones,then used the early(up to '43) perches. We played with shackles and , still may need to have a custom main leaf made. sparky
The upper perches are part of the wishbone... They are factory for whatever front beam this thing is....
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