DDK - Die Deutschen Klassiker

Hi all

I do not have much experience with the 915, however, I'm struggling a little shifting into second gear. As much as I've adjusted the linkage, replaced linkage bushings, replaced gearbox oil and the transmission mount/engine bushings it has improved but still feels "notchy" into 2nd, especially more so when cold. But it doesn't grind.

To me, with my inexperience, the "notchiness" feels like a linkage/selection issue and I should add that I do have the Porsche short shift kit and solid PSJ joint which no doubt makes adjustment more critical.

HOWEVER if I match the revs on the downward shifts it changes beautifully - that implies that it could be the syncro ring which I understand to be a weak point. Others gears are absolutely fine - is 2nd gear syncro likely/known to wear far ahead of others?

Any thoughts out there?

I have 2 boxes, both rebuilt and both are like yours!
The one improves with heat on a drive.
Suggest a call to Mike Bainbrige in the Lake District.

With a tight modified gear lever assembly ( I have this too) adjustment is very critical.
My other race car box has no such thing and is still hard at times.
Does double de clutching help when cold?

If it’s not been done it will be worn synchro rings. Change them before it starts to crunch otherwise you’ll need a new 2nd gear with sharp dog teeth and a new selector ring.

My wallet speaks from experience

The short shift isn't really your friend as they can be a pain if the reverse lock out is 'sticky' or there is wear in the pins.

I would still tend to blame the synchro but would also be inclined to change the dog ring at the same time.