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Are you still using the pinion crush sleeve  to set the pinion bearing preload or a spacer and shims?  If crush sleeve, lose it and buy a spacer from Ratech   Better yet,if you have access to a 742 case get it and use it
If I go to a 742 case then I need to buy another spool don't I?
No, but the ring and pinion is different as are the bearings for the pinion gear. You'll also need setup shims and the gear selection for the 742 case isn't as great as for the 489.
"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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