I had a 2nd Gen tranny rebuilt with synchros and it still sucked after the rebuild (regular tranny shop). I had problems changing gears and the tracks I run are mostly 3-4 only, sometimes 5th if a roval course. I was missing shifts, grinding gears, having to force things sometimes, just not any fun.
About 3 race weekends later I let a new shop (race shop) that knows more about these tear it down and rebuild again . It turns out all the shift forks/rod ends were worn out and they had to be changed. They also changed all bearings, synchros, 5/R shift hub, 3/4 hub slider, 1/2 hub slider, all slider springs and 3rd gear. 5th gear was also changed but just because I want the .756 (this is all from the receipt). Since then, I have been happier with my tranny but not paying for two rebuilds, especially the cost of the 2nd one.
Not sure if this helps at all, but as you can see mine needed a bit more than synchros.
Mark B. - Dallas, TX
#76 RX-7 2nd Gen
SCCA EP
Former ITS, ITE, NASA PT
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