Differential replacement
Thread Starter
2018 platinum
Joined: Aug 2021
Posts: 1
Likes: 0
From: Florida
Differential replacement
I have a 2018 Ford F-150 platinum 4x4 with a L9 rear axle differential and it is damaged ,I have a replacement differential but it is a L3 ,I want to know if it fit in my truck .thank you
5 Year Member
Joined: Dec 2016
Posts: 1,031
Likes: 268
From: OBX
are you talking just the guts in the diff or are you talking the whole axle assembly? If they are both from the same axle (super 8.8 or 9.75") then yes you can swap, but the L9 is a 3.55 ratio and the L3 is a 3.31 ratio. If you use any of the 4wd modes it'll bind up and likely grenade something very quickly. Find the correct parts.
5 Year Member
Joined: Mar 2009
Posts: 1,322
Likes: 532
From: The Great Midwest, aka, Flyover Country
are you talking just the guts in the diff or are you talking the whole axle assembly? If they are both from the same axle (super 8.8 or 9.75") then yes you can swap, but the L9 is a 3.55 ratio and the L3 is a 3.31 ratio. If you use any of the 4wd modes it'll bind up and likely grenade something very quickly. Find the correct parts.