I don't know...
I have one with a strange spool and axles with 5.14 gears in my car . The axle tubes are welded up and it just has a stock cover... I Have no clue the power level but it is a 13:1 540 BBC with a solid roller . Powerglide with a brake..car weighs around 3150-3200 lbs. Ladder bar/ coil overs... 1.31 60 ft
Never had any problems so far knock on wood, but my car is just a NA bracket turd....