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I've meanwhile replaced the pinion and differential too. (I wanted an OS-Giken and it was out of stock for quite a while).
I got an old IS250 differential, the pinion ring gear kit from Weir Performance and that OS Giken differential.
Once I realized how hard it is to get that bearing off, I also ended up buying a press (it was about €100 - definitely worth it, even if you only need it for this project).
I wasted a lot of time setting the pinion depth.
I actually ended up doing it twice because I initially used the original bearings. I think this was a well meant hint, but unfortunately the old bearings didn't have the exact same size (they did have the same thickness, but the size of the rollers differed).
Also, while I did read that the pinion depth is written on the end of the pinion, I got thrown off by the units.
It said 2.44 on the pinion which I interpreted as 2.44 mm, since the original measured 1.98 mm and some people here mentioned 2.01 mm. So, I thought 2.44 mm sounds about right.
It turned out to be 5.50 mm with the old and 6.22 mm with the new bearings. I then realized that 2.44 must have meant 0.244 inches which is 6.20 mm. It took me countless iterations to get from 2.44 mm to 6.22 mm (which was written on the pinion all this time). I wasn't not sure whether I deserved a trophy or a hammer on the head.
The differential housing is actually kind of nice as it came with these cooling fins. (They must have sold a different version here).
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