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 70’s, believing the
slider to be the main
cause of the problem, we developed a machine to recut the flanks (sides) of the
slider’s engagement teeth. Extensive tests proved our unique
machining process solves the
jumping out of gear problem.
What we found was, 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.
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 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 automated tooling
insures precise tooth spacing and 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. Naturally, sliders that were never factory undercut will benefit
greatly as well. The bottom line is that our remachined sliders
are capable of uniform engagement and are able to stay in gear even in high horsepower,
environments. Long Enterprises has been providing this specialized
machining service to VW transaxle
rebuilders for the past 35 years.
©LONG ENTERPRISES 2000-2013
Prevent jumping out of gear
with remachined sliders...
from Long Enterprises
remachine both new and used sliders and sell them outright (no
core). Prices vary accordingly, so please call for quotes on
these. If you
would like your sliders remachined (please see prices below), this is what we need:
Sliders must be
and oil free, especially in the splined area which is where we index
from. Glass beading is not necessary, but preferred. Check your shift fork clearance and reverse teeth.
Also check the condition of the
engagement teeth on your gears!
If you need replacement drive
hubs please see prices below.
include a note with the following information: How many 1-2 and
3-4 sliders you are shipping.
Tell us if you want standard cut, (street use), or pro
cut (performance/off road), or any additional cut as needed
tell us the method of payment
Visa, M/C or COD (money order, cert. check only).
return ship UPS Ground unless you specify faster.
2475 Morse Road
Sebastopol, CA 95472