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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, rebush gear carriers, tighten detent springs, etc. 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 solved the jumping out of gear problem. What we found was, unlike gears with their greater mass, the majority of sliders are out of round (most likely occurring during factory heat treating). While rounded corners and unfavorable tooth angles can be easily seen, uneven tooth spacing generally cannot. This out-of-roundness and subsequent uneven tooth spacing causes some teeth to carry a greater burden of the load than others. With many gears having only 3 sets of 3 'fat' drive teeth 120 degrees apart, (the remaining 21 'skinny' teeth carrying no load), it's critical that the engagement teeth on the slider be able to contact all 'fat' drive teeth on the gear evenly. This uneven or asymmetric loading of the slider, is the most common cause of jumping out of gear. Our automated tooling
insures even tooth spacing and improved tooth geometry as the undercut
is slightly steeper than any factory cut. In addition, since
the process removes very little material, excessive backlash is not a
factor. Naturally, sliders that were never factory cut 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,
high load
environments. Long
Enterprises has been providing this specialized service to VW transaxle
rebuilders for the past 25 years. |
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Prevent jumping out of gear with remachined sliders... Only from Long Enterprises We remachine both new and used sliders and sell them outright (no core). Prices vary accordingly, so please call for quotes. If you would like your sliders remachined this is what we need: Please clean the sleeves, 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 don't forget to check the condition of the 'fat' engagement teeth on your gears! If they're worn, don't use them! Please
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 We return ship UPS Ground unless you specify faster. Ship
to:
Long Enterprises |
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