RennShifter, Vroom! Vroom! She's in... Options

[GTeener]

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Got my Rennshifter installed finally. Wow, what a difference. Shifting is much easier.

But...I still have probelms engaging 1st sometimes. Does my shifter need adjusting or is there a transmission problem?

[JWest]

What are the actual conditions when it won't go in?

It's probably the typical Porsche syncro problem - they don't cope very well with engaging first at too low a speed - some (just enough) rotation is needed to allow the syncro to work to allow the dog teeth to mesh "just so." Worn parts (syncro, slider, dog teeth) just make this worse. It's really true of almost any gearbox, but it is a bigger problem with servo syncros.

What if you double de-clutch on the downshift to first just before stopping - does is go in everytime? Is it an issue only while stationary?

The radial adjustment is correct when the 1/2 shift can be made by just pushing the lever forward with no side-to-side correction, and the reverse lockout operation will determine the correct fore-aft position. As Mark said, back off the front stop bolt to see if that helps.