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Building a Better GM 12-Bolt - Axle Allies

Better Axles and Bearings For the GM 12-Bolt

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This conversion will radically improve the stock 12-bolt's strength and axle retention when combined with a stronger Moser aftermarket axle. Now that Moser has pumped a bunch of strength into our 12-bolt, it's time to hit the track and start abusing our Chevelle all over again.

  • Performance Machine Ring Pinion Setup
    Our pal Tim Moore used his T&D Machine ring-and-pinion set-up tool to accurately dial in our 12-bolt with the proper pinion depth and backlash for the 3.42 gear.
    Performance Machine Ring Pinion Setup
    Our pal Tim Moore used his T&D Machine ring-and-pinion set-up tool to accurately dial in o
  • Performance Machine Pinion
    Once Tim had installed the ring-and-pinion centersection, we installed a set of Baer rear caliper mounts for the disc brakes, slid the Moser axles in place, buttoned it all up, and were ready to go. Moser recommends breaking the new gears in with 50 to 100 miles of easy driving before subjecting the rear to performance use on the dragstrip or the road course.
    Performance Machine Pinion
    Once Tim had installed the ring-and-pinion centersection, we installed a set of Baer rear
Parts List
Component Company PN
Housing ends, 9-inch Moser 7900
Axles, 30-spline Moser call
3.08 gear Moser 12B308
3.42 gear Moser 12B342
3.73 gear Moser 12B373
3.73 gear, 4-series carrier Moser 12B373-4
4.10 gear, 4-series carrier Moser 12B411
4.10 gear, 3-series carrier Moser 12B411X
Truetrac, 30 spline, 3-series Tractech 913A555
Truetrac, 33 spline, 3-series Tractech 914A564PA
Truetrac, 33 spline, 4-series Tractech 914A575PA
Complete install kit Ratech 315K
Solid pinion spacer kit Ratech 4101
Clutch disc adj. pack Ratech 1801
Pinion gear washers Ratech 2803
Pinion shaft Ratech 5805
Pinion shaft bolt Ratech 5812
SOURCES
Moser Engineering
2-60/-726-6689
moserengineering.com
Sutton Engineering
6-26/-961-9369
Ratech
11110 Adwood Dr.
Cincinnati
OH  45240
5-13/-742-2111
Tractech Inc.
11445 Stephens Dr.
P.O. Box 882
Warren
MI   48090
www.tractech.com
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