A bit late, but for the sake of future googlers, I'll include my experience.
I purchased a q45 3.69 R& P and only have R200 S14 open differential casing. I disassembled the s14 differential and found that the tapered outer pinion bearing and race, were much smaller than the outer pinion bearing on my Q45. Apparently the Q45 had a R200V housing which utilizes a much larger diameter race and bearing. So what I needed to do was pull off the bearing from the open differential pinion, and press it onto the Q45.
Right now, I utilized the sleeve that came from the open differential (longer) with pinion height and bearing washers from q45. Everything is bolted in, however the differential and pinion are binded. It was free rotating peior to installing race caps. I can't even rotate, after my battle of seating the differential race and shims.
Next step is to disassemble again, and use the sleeve that came with the Q45.
I'll update if successful
Sorry for the bump over year. Just figured this could be helpful for others in the same position .
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