Well, since we have been selling the crap out of Moser rears, I have learned a bit about rear ends. The hot set up in a differential today is the True Trac. Actually, a 12 bolt Moser 33 spline True Trac is stronger then a 9" True Trac partly because it is bigger then the 31 spline offered in the Ford, and also because Moser has built up the original 12 bolt with their new castings. The other weakness in a 12 bolt is that the pinion tries to push the center chunk out of the back of the rear. A Performance cover takes care of this buy adding support to the center chunk main caps, which I have proven with 900+ HP in my street racer launching 100s of times on slicks with 1.30 short times. Now if True Track would make a 35 spline for the Ford like they do for the Dana / Moser 60s, that might turn things a bit.
So for GM guys I sell mostly 12 bolts with True trac's and with "Torino" (Ford Big Ends) and a performance support cover. If someone has a LOT of power, they are forced into a 35 spline Detroit Locker. Which if you ever had a Locker on the street, it is like driving a spool. UGH!
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Frank Serafine
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