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By joshuaho96 · Posted
How fast are you doing the downshift? 4th gear was revised multiple times until 1998 to fix this issue. Synchro clips can fall out, synchros can wear. Most likely you're looking at a new transmission unfortunately. If you need to limp it until then double clutch downshifts into 4th. -
Sorry I was being harsh there, but am I wrong? You can buy a M340i easily, and there's loads available second hand. A lot more workshops modifying them as well. How about getting parts for them? Don't get me wrong, I'd love a 400R, even a 4cyl (I looked at a few V36s before buying my shitbox BMW). Sadly Infiniti died in Aus and we're stuck with importing them as niche vehicles. Supply and demand -
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Yes I think we changed out the transmission fluid as I had a leak last year so we changed out the seals also. Need to check. I should have said just change from 5th to 4th gear … down shift. There’s a grind. I have a new clutch X clutch … but as I said all the changes in other gears are fine. -
By joshuaho96 · Posted
Change the transmission fluid. I would try Motorcraft XT-M5-QS if you have it in your area for a reasonable price. Also, double check your clutch is fully disengaging. If you are not pushing the clutch pedal to the floor fully for every shift now is the time to start. Make sure the clutch is fully bled. The damper line requires two distinct bleed points to be purged of air or it will not disengage the clutch properly. If either hydraulic cylinders input or output are losing hydraulic pressure in their seals/leaking you can have problems like this. If you've ruled out everything else then the most likely explanation is the synchros are worn and you need to double clutch the shift or rebuild/replace the transmission. The transfer case is discontinued FYI so you may want to rebuild it while you're in there too. If the chain stretches past spec it can do a ton of damage.
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