Yes I know it’s not the RS.

Another thing that bugged me about the Lego GT3RS trans was that you could pull the upshift paddle forever and it would just cycle through the gears.

Top left: 1st) Top right: 2nd) Bottom left: 3rd) Bottom right: 4th

This is because the shifting is done off of an axle with these little “cams” for lack of a better term. From the instructions, there is no way to stop the rotation at 4th gear, allowing you to go from 4th to 1st and then to 4th again with just a pull on the downshift paddle.

Don’t worry because I’ve done something that Lego should have done in the first place.

There are other ways to make a piece to perform this task, but this is small, elegant, and very hard to spot.

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Put that little bit that you’ve made in there and you’re good to go.

This is it in 1st. Notice how the little “cam” can’t rotate backwards, so the downshift paddle will do nothing.
And this is it in 4th. It can’t rotate any farther so you will have do downshift to go to any other gear.

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So I hope this helps.