8.75 durability for big block street/ Strip

My son tries to change out his gears every three years or so. His last set of 4:10 gears went three years of 10 teens to 10.30’s with radials. His rearend is unbraced and stock bearing caps with a spool and 35 spline axels. A Friend wanted them bad for his 9 second big block heavy Duster and is now in his second year with them.
Which rear end?