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Old 06-18-2019, 03:37 PM   #1
Senior Member
Join Date: Apr 2016
Location: keizer
Posts: 116
Seismic Leaf Springs Flattened

The leaf springs on my '16 355w have flattened out, see pic below.
I run right at GVW when fully loaded which I'm sure contributed to the sag. That and I'm sure they are not high quality springs to begin with.

So, since I need to replace the springs, I was thinking of upgrading the axles from 7k to 8k axles. Jayco started using 8k axles on the 355w in '17, so fitment shouldn't be an issue. It also would give me a little cushion from pushing the max axle rating.

Has anyone here done this? Any advice?

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2016 355W Seismic
2017 Ford F350 6.7L Lariat
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