The 742 is the strongest as it has the largest rear pinion bearing of any passenger car rear end, including the 489. Yes the pinion shaft diameter is slighly larger at 1 7/8 than the 742 at 1 3/4 but that's already larger than the Dana 60 pinion shaft so it's a non issue. It's the size of the rear bearing that keeps pinion head deflection to a minimum.
"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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