[Vwdiesel] Trans oil

[The Lecrones]

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I just bought a jetta (86)TD.The engine runs great.The pump and turbo have been worked on.With one lower control arm bushing out on the left and a ball joint out on the right the handling is ugly.
What kind of oil do you guys like in the trans?Upon checking it the level is down and it seems to be built up with sludge. Gl-4 is not easy to find here. They are usually
gl-5.Does this have a negative effect? Where are they handling gl-4?
                                                   Jim
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