They will make a load of difference, trust me. Just make sure when you are building it tighten a bit at a time and testing it for slip, otherwise if you don't do it gradually and tighten it right up an then back it off it will force the balls into the diff plates and pit them making your nicely flattened plates worthless. Also make sure you do a decent run in on the differential before you hit the track.
With regards to the spring an nut, I have never had any problems but if you do change the spring make sure to compress it with a pair of pliers a few times before you stick it in otherwise you will have a diff that you can't tighten anymore but will be constantly slipping on track. The thrust bearings are fine as long as they are properly lubricated.
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