[USNChief]

Do I need to change/replace the "ring and pinion"?

 

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if you want to change the ratio

 

[USNChief]

Sorry, wrong question. I'm getting help with this and the questions was given to my wife.

The question is do I need to do anything (replace) to the ring gear carrier. By the way, I could not find that on the diagram from the shop manual.

 

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no. the 3 series will work for 3.73 gears

 

[TimAT]

Get the case nice and clean, inspect it carefully for cracks around the "windows", and then look at the ring gear bolt holes and remove any burrs with a stone.