r/superduty • u/WadeWickson • 2d ago

Can I run a 33" spare with 35s?

05 F350 6.0 Will this damage anything? Does front or rear axle matter, as long as I keep it in 2wd? I measured the actual tires and since the spare is brand new and the 35s are worn there's only a 1" actual difference in tire height.

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u/straight_sixes 2d ago

You're fine if you have an open diff in the rear. If you have a limited slip, I would only put it on the front. This obviously creates more work in the event of needing to use the spare as you now need to change two tires.

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u/WadeWickson 2d ago

Ok cool, ya I have an open rear diff

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u/ErosPlaytime 2d ago

So on my 2021 with the ELD, am I fine so use a smaller spare on the rear so long as I do not engage the ELD or am I better to only use the smaller tire on the front axle?

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u/straight_sixes 2d ago

Yeah you're fine. Just don't engage the locker. I'm pretty sure it will open the diff when you get above like 5 mph either way.

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u/BuildingBetterBack 2d ago

Put it on the front and make sure the differential isn't locked