Gearbox dif driveshaft oil seal

Hi does anyone know how to change these oil seals?

Do they just pop in and out?

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I think it takes 10 90, Don't hold me to that, and the drain is near the passenger side driveshaft, Filler is about half way up on the front, big hex keys on both of them.
 
2.8-3.0 litres. I use 75/80 oil and when you remove the driveshaft the oil comes out. Never used the drain plug. I refilled through the speedo drive.
 
Of course filling it through the filler plug ensures you have the exact right amount in it, If there's one thing I do properly, its oil levels, other wise having too much could bust another seal, too little and it could bugger the box.
 
I contemplated doing it through the speedo, but does it not take ages? As the hole is small in comparison to the full hole? My plug was rusted shut but eventually welded a 10mm to it and got it of them just replaced it, although could save me in future if speedo is as quick as fill hole.
Cheers
 
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