Steering Box Seals

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Got a leak on my steering box from the bottom where the Drop Arm attaches.
I have a decent spare box and unattached drop arm that also needs the seals in the same place.
Can these seals be put in without taking the whole box apart?? I know the drop arm will have to be removed.
These are the seals that I need here LAND ROVER DEFENDER & DISCOVERY 1 POWER STEERING BOX SEAL KIT - STC2848 | eBay
Thanks

 

[jamesmartin]

thats the kit if you get drop arm off you can do job in situ, remove dirt seal then circlip,place container underneath switch engine on and work steering to one lock it will blow seal out,clean shaft with very fine emery before fitting new seal

 

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thats the kit if you get drop arm off you can do job in situ, remove dirt seal then circlip,place container underneath switch engine on and work steering to one lock it will blow seal out,clean shaft with very fine emery before fitting new seal

Thanks James. Dont know whats easiest? whether to reseal the spare box I have then fit spare drop arm and replace whole thing.
Or get drop arm off the box thats on the truck now and replace seals in situ as you explained.