GEAR POP-OUT CAUSES AND FIXES-GBox Transmission

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GBOX, INC.

455 YOUNG CT. UNIT 1

ERIE, CO.  80516

303-440-8899

GBOXINC@YAHOO.COM

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Mon-Fri > 8am - 5pm MTN.

Sat-Sun > By Appointment.

GEAR POP-OUT CAUSES AND FIXES

The gear pop-out problem comes from several issues which affect the engagement of the operating sleeve with the dog ring on the gear (for an explanation of op-sleeve/dog ring operation, see the Synchronizer System Tech Tip page) , 'cold pop-out' and dog ring/operating sleeve damage being the two biggest issues.

Cold transmission pop-out is an oil contamination problem that can lead to operating sleeve and dog ring damage (see the Oil Contamination Tech Tip page). Installing the GBox detent will help prevent cold popout, but will not fix dog ring/op-sleeve damage.

Op-sleeve Damage

Op-sleeve damage (note rounded-off teeth)

Op-sleeve/dog ring damage is when the mating teeth of both parts are damaged to the point where they will not engage each other or will not stay engaged. This damage can occur when the synchros wear out, when 'speed-shifting' while racing, when shifting while the clutch is not fully disengaged and from popping out of gear. The operating sleeve can be modified to increase its engagement with the dog ring; this must be done before any damage occurs.

When the gearbox is being rebuilt, the GBox detent and the modified operating sleeve should be installed as preventative measures to fix the 'pop-out problem' and help keep it from re-occurring.