The problem with an E153 box will be finding the driveshafts, they're a bit hard to come by (as are the boxes).. and note the E153 boxes are worth a small fortune (and that's IF you can find one)
If you want LSD maybe look into getting an E154 (GT4 box) and modifying it to disable the rear transfer casing (st165 and st185 variants of these should be easy enough to come by and not cost too much).
If you're just looking for an easy box to slip in as a replacement with better ratios and no more fiddling around to it, and something that doesn't won't cost you too much to obtain, go for an S54, but hunt around for one with better ratios to suit your need (they are out there!)
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