Retired Roughneck
Senior Member
hello, i have a 05 E-350 and i cant figure out the spring code?
i believe the VIN says it is rated for 11500lb.
i have mine rated under at 9560 fully loaded.
it rides ok but rough.
my left rear leaf is strait.
and the right rear leaf has a little under camber to it.
so the bus leans to the right a little.
spring code says RR66 ULN
i have been searching the internet and cant seem to find any translation to what my leaf or front springs are?
VIN says incomplete vehicle.
does anybody here know what code sizes & weights i have?
i did go under with a wire brush and looked in various places on the leaf looking for part numbers but couldn't
find anything?
would running a new & less weight leaf give me a smoother ride?
or should i put the same new OEM back in?
shouldn't my Leafs have a camber in it?
or is it normal to be strait with the weight on it?
i got 3640 lb in the front
and 5920 lb in the rear.
VIN sticker says 7800 lb in the rear GAWR.
would it be ok to downsize a leaf to make it like 7000 -6500 lb?
would that make it ride better?
or even make a difference?
any schooling or help would be greatly appreciated.
thanks in advance!

i believe the VIN says it is rated for 11500lb.
i have mine rated under at 9560 fully loaded.
it rides ok but rough.
my left rear leaf is strait.
and the right rear leaf has a little under camber to it.
so the bus leans to the right a little.
spring code says RR66 ULN
i have been searching the internet and cant seem to find any translation to what my leaf or front springs are?
VIN says incomplete vehicle.
does anybody here know what code sizes & weights i have?
i did go under with a wire brush and looked in various places on the leaf looking for part numbers but couldn't
find anything?
would running a new & less weight leaf give me a smoother ride?
or should i put the same new OEM back in?
shouldn't my Leafs have a camber in it?
or is it normal to be strait with the weight on it?
i got 3640 lb in the front
and 5920 lb in the rear.
VIN sticker says 7800 lb in the rear GAWR.
would it be ok to downsize a leaf to make it like 7000 -6500 lb?
would that make it ride better?
or even make a difference?
any schooling or help would be greatly appreciated.
thanks in advance!