Honestly if I had it to do over I'd go with a Dana. I have a lot of money in my 8.75 with a spool, the MP aluminum case and pro gears that are only available in one ratio, a 4.86, so in hindsight if you are going to have to narrow it, buy axles and all that just get a Dana and be done with it. 
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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