If you are going ahead with the IMS replacement with metal in the oil, the LN replacement may not be the best solution as it has the bearings open on one side so that they can be lubricated by splash oil. This means metal residue can get in and damage the bearings.
Your better bet may be to buy a Pelican IMS bearing in which the ball bearings are incased and lubricated with grease. This will protect the bearings from larger metal particles in the oil and is cheaper.
I've seen this written before, but I'm not a mechanic so take it with a grain of salt.
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