One of the most
common problems with VW transaxles is their tendency to jump out
of gear for no apparent reason. Despite
the best efforts of conscientious rebuilders to properly adjust shift
forks, tighten detent springs, even remove the "fat" drive teeth
(bad idea) these gearboxes
can still jump out of gear. This
is expensive and aggravating for both the customer
and the rebuilder. The reason for the failure of these linkage related attempts to fix the problem
is simple: The fork doesn't hold the slider in gear. The slider and gear stay engaged as long as
there is correct tooth geometry. Back in the 70ís, believing the
slider to be the main
cause of the problem, we developed a
method to recut the flanks (sides) of the
sliderís engagement teeth. Extensive tests proved this unique
machining process solves the
jumping out of gear problem.
We found, unlike gears with their greater mass, the majority of sliders
of round (most
during factory heat treating).
While rounded corners and unfavorable tooth angles are often
apparent, small discrepancies in tooth spacing
on the sliders generally cannot be seen. This out-of-roundness
and subsequent uneven tooth
spacing causes some teeth to carry a greater burden of the load than others.
Many forward gears
have only 3 sets of 3 "fat" drive teeth 120 degrees
apart, (the remaining 21 "skinny" teeth carrying no load). It
critical that the engagement teeth on the slider be able to contact all 'fat'
drive teeth on the forward gear evenly. Otherwise the uneven or asymmetric loading of the slider
will cause the transaxle to jump
out of gear.
Click here for
more discussion on undercut tooth geometry.
Our remachined sliders have improved tooth geometry as the undercut
produced is slightly steeper. In addition, since
the process removes very little material, excessive backlash is not a
factor. Our remachined sliders
are capable of uniform engagement with the ability to stay in gear even in high horsepower,
Buy now at these one-time-only
liquidation prices while they last!
©LONG ENTERPRISES 2000-2019
Prevent jumping out of gear
with remachined sliders...
From Long Enterprises
remachined sliders and drive hubs outright (no
core) now while supplies last!
Popping out of 4th gear repair kit.
Includes a late style 3-4 slider w/standard cut
on drive flanks of 4th & drive
hub, w/ 3X5 good "fat" drive teeth. Add $50.00 for matching
5 mm late style
1-2 Slider late style, standard cut (coast
side of 1st & 2nd), sold outright (no core)
3-4 Slider late style, standard cut (drive
side of 4th), sold outright (no core)
Drive hub, w/ 3X3 good "fat"
drive teeth (xlnt. used)
Drive hub, w/ 3X5 good "fat"
drive teeth (xlnt. used)
check the condition of the
engagement teeth on your gears!