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October 25, 2006
Moser 35 Spline Axles
The 9" rear has 35 spline Moser Engineering rear axles, with a 5x4.75" bolt circle. Centerbore at the brake rotor is 2.772" and necks down to 2.758" for the wheel. The torque rating is 9600 ft-lbs per axle.
http://www.moserengineering.com/Pages/axletech.html
They originally came with ARP studs, 2.5" long, M12x1.5 thread, .505 knurl, .484 drilled hole, Moser p/n 8255, $17.50/10. The interference fit is .021"
Replaced with GM late model ARP studs, 2.5" long, M12x1.5 thread, .509 knurl, .315 knurl length, 100-7708, $16/5
ARP Techline recommended a .005 interference fit for steel flanges and .007-.008 for aluminum. Moser had a .021 interference. Corner-carver mustang guys use a 15.5mm (.610) reamer for the .625 knurl and .015 interference fit.
I ended up drilling the hole with a 1/2" stubby, with the hand drill (the belt on the drill press kept slipping). The holes measured .500 to .503, and I gave it a shot (.012 interference based on my measured .512 knurl OD, with the garage calipers). The studs pulled right in, no binding, nice and straight on the drivers side. I did the passenger side with the axle still in the rear end housing, and the studs went just as smoothly.
Posted by Z28tt at October 25, 2006 5:37 PM