Go ball diff I reckon, on both of my old SC10's I went that route and as you said it's easier to drive
B4.1 diff (metric outdrives) will drop straight in your gearbox, you can use the Associated diff or MIP make a SC10 ball diff
If you want to use an original B4 diff you'll need the diff, B4 diff case, imperial bearings and the lower chassis T plate
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