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Third gear goes missing .....sometimes


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I seem to have a problem with 3rd gear , in that it is difficult to find in the following situation

- Usually happens after 3 laps , Gearbox External temp is 82c / 179F[ taken on external case using thermocouple sensor, need to rig up proper Oil temp Sensor]

- Using Redline Oil MT90 Sae 75w90 / replaced recently.

- At the end of a straight downshifting from 4th to 3rd , 1.5 Long Braking G Force into Left hand corner. [ Only happens in this situation]

- Shift just does not want to engage , feels quite "soft & mushy" around the gate , but will not engage. Takes 2-3 attempts to get it engaged. Once engaged , no problem or noises from the box.

- Works fine on the rest of the track up-shifting - downshifting

- Using a Letsla quick shift on Standard setting / Simply sport gear cable and have replaced all the engine mounts with the Innovative "85A Race Grey" / Have also added extra strength to the shifter base to stop flexing.

It is interesting that it happens after 3-4 laps at speed , have paid close attention to my driving style , soft shifting etc , but to no avail .

Gearbox temp [ external ] is constant, from start of session 62.5c / 143F to 87.5c / 188F after 8 laps

Any thoughts .... or is this part of the known problems ?

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