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Ze flying Russian
2007 STI
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2,008 Posts
Discussion Starter #1
Can anybody explain me the basic principals behind the reasons why a gear pops out. And whether those reasons are the same for both front and rear gears. And why would a gear hold fine even a substantial load while at very low speed (~5-10mph) but pops out even while barely loaded (spinning all 4 tires on ice) once the speed reaches ~15, maybe 20mph.

Thanks.
 
L

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Guest
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As far as I know, usually gear pops out because of depreciated fork (see picture). It can happend because of wrong oil or often trailer using or something else :)

Ç.Û. Âñÿêîå áûâàåò, ìëèí.
 

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Ze flying Russian
2007 STI
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2,008 Posts
Discussion Starter #4
I'm not sure if the rear gear even has a synchro, but nevertheless thanks for the info!

Anybody else?
 

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Premium Member
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261 Posts
Possibly linkage adjustment. Not letting the syncros ingage fully is another possibility. Usually if this is allowed to continue you will need some parts replaced in the transmission.
 

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Premium Member
2014 Impreza Ltd CVT
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3,319 Posts
The detent ball, if chipped can do it (number 1 in your graphic), as well as a weakened or broken detent spring. Or the selector shaft itself that the detent ball lodges into. As well as a shifter adjustment, chipped or broken rails, chipped or worn tooth on synchro gear, and those you may not always feel or know they are there unless you do a complete tear down. A worn or bent shifting gear fork. Many many things and yes as simple as the wrong type of lubricant that allows too slippery a surface for the synchro's.
I can't speak directly to the current Subaru 5 speed, but I have been in many other manual transmissions over the last 40 yrs.
 
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