Yeah IMHO it's definately worth fitting a solid pinion collar if your current diff feels like it has plenty of backlash. It's not an expensive mod, seems totally pointless till you pull apart a diff and see just how much the factory crush collar can/is compress/ed, you realise why crown wheel failure is so common. I've seen quite a few apart now, each one with broken teeth had a rooted crush collar. If your plans are to keep it N/A and you don't have an abusive style of driving then this is all you'll need. However if your planning going down the route of F.I. then also upgrading the diff centre end caps to stronger, reinforced caps is also a sensible mod. As the extra torque will cause stress in these area's.
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