What to do with 9 3/8 diff
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Mountain Pass
Joined: Sep 2021
Posts: 233
Likes: 36
From: KY
What to do with 9 3/8 diff
79 F150 4x4
I have a project with a 9 3/8 rear end. As far as I know it didn't have any problems but has sat for 10 years. I've never done any diff work before but plan on getting into it tomorrow. Should I replace the seals/bearings, look for a 9" third member, or look for a complete rear end? Initially I was thinking of replacing but as time goes and budgets run tighter I'm not sure which would be the best option.
I know it's not worth keeping if it needs a serious rebuild due to finding parts, but if the teeth look fine is it worth it to just re seal everything for now? I'm not sure of the compatibility across years so I'll take any suggestions or help you can give.
Thanks for the help in advance.
I have a project with a 9 3/8 rear end. As far as I know it didn't have any problems but has sat for 10 years. I've never done any diff work before but plan on getting into it tomorrow. Should I replace the seals/bearings, look for a 9" third member, or look for a complete rear end? Initially I was thinking of replacing but as time goes and budgets run tighter I'm not sure which would be the best option.
I know it's not worth keeping if it needs a serious rebuild due to finding parts, but if the teeth look fine is it worth it to just re seal everything for now? I'm not sure of the compatibility across years so I'll take any suggestions or help you can give.
Thanks for the help in advance.
Logistics Pro
Joined: Oct 2006
Posts: 4,029
Likes: 891
From: East Central Ia
Is it leaking from any of the seals? Seals and bearings all have numbers stamped in them. Shouldn't be that hard to find. Have you translated the rear tag to find out it's 9 3/8? Only 10 years setting, I would be more worried about brakes. JMO
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Mountain Pass
Joined: Sep 2021
Posts: 233
Likes: 36
From: KY
I'm judging it to be a 9 3/8 just by the 3rd member design. Pictures below.
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