Usually in cars driven by people who are not mechanically sympathetic (read: don't realise/care that a big graunch when changing gears means that the car is not happy...)
Many are NOT contributing to this discussion,in fear of upsetting their mechanics,parts suppliers etc..and because they read the first post about only reputable people to add to this discussion.
I've been looking at a couple threads containing the quotes above and thought I would help with a solution I'm experimenting with.
What I've discovered is what Porsche did in a redesign of the anchor block. Instead of "rocking" in it's slot the new design also pushes out on the band/ring and the block is longer spreading-out the apply effort on the ring.
I've been using this Porsche design for 2K miles now without clashing 1st to 2nd at all! Could be other factors involved in the improvement; but maybe it alone made the 100% improvement. I'm still evaluating it and will be doing more modifications to see how they perform.
Initially the shift to the modified syncro (2nd gear) was 20% harder getting into gear than the others but now after a bit of break-in, it takes maybe 5% more pressure (actually I can't tell the difference somtimes) to get in 2nd gear than the other non-modified syncros.
pleased with 1st to 2nd apply as it's clean with no clashing. In testing, I have been brutal with shifts (1 out of 10 shifts), so far it's a wonderful thing getting every shift into 2nd without that awful clash
I've been building Italian boxes for customers and my own cars since 1978 (still learning) and I'm always looking for other ways to do something better than just installing new expensive parts or lightening gears (expensive too!) with average results.
I'm hoping this concept will help this thread show us new ways to get the Best Shifts Ever! Feedback Welcome.
Below is a late 911 style anchor block modified to work with a 65mm ring.
In some cases when larger rings are used; an actual 911 anchor block might be a direct fit for just $16-$25. Porsche calls this part "Anchor Block" in part descriptions, other makes call them "Servo-Lock", "Stop Block", "Synchronizer Pad" and some other names. They come in different sizes to fit gear/rings from about 70mm to 86mm.
As far as I know Porsche might be the only manufacture who has continued development of this synchro design from it's inception on the 1952 356 transaxle to I believe the late 80's 911/930/928.