Pull the trans, inspect the over running clutch, no doubt about it. No way, no how I would chance it.
As for the 42 vs the 89, the 42 is stronger in that it has a larger rear pinion bearing which in turn reduces some pinion gear deflection. Other than that, no they are the same. Inspect the caps carefully as well as the carrier.
"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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