Not nesessarily so, the two axle splines are 28 and 31, But they use the same crappy Ford type posi that break the carriers in half. Pinion diameter on a 9" is 1.313, the smallest Mopar the 741 is 1.375. Yeah you'll say but the 9" has a third pinion bearing? They have to!!!! the inner and outer bearings are only .250 apart! The third nose bearing is to keep the pinion stable. Just like the 9" with good after market parts you can make the 8 3/4 just as strong. Bottom line, KEEP YOUR MOPAR ALL MOPAR! Or buy a Mustang to put the 9" in. JMO
