I just had the tranny oil changed on my 93 FD a couple of weeks ago. Ever since the change there has been a slight disjointedness, almost a light 'thud', when shifting from 2nd to 3rd that did not occur before the change. If I downshift from 4th to 3rd it does not occur. It's only on the 2nd to 3rd change. Looks like there's a lot of info on here about 5th gear problems but not much if anything on this. I'm doubting it's a synchro issue or anything serious since it only occurred after the fluid change. Anyone have any ideas?

Thanks

 

Did they put the correct oil in? The transmission takes good old fashioned 80W 90 gear oil, not ATF like many transmissions.

 

Well it's a mazda and rx7 shop specifically, so I would hope so. Honestly I'm not sure. Every gear feels fine except when I go from 2nd to 3rd at a specific RPM range. If I short shift it feels fine, if I redline 2nd it feels fine. It's in the normal daily driving shifting range that it feels just slightly clunky. I'm wondering if it's something as simple as a brand difference from what was in there compared to what it was replaced with.

If there is ATF in there worst case, just drain and refill or $$$?