Strudul Posted November 2, 2016 Share Posted November 2, 2016 (edited) Having some issues when trying to shift gears... It's hard to engage 1st, 2nd, and 6th Gears. The others are perfect, have zero problems and are very smooth. With the clutch fully released, trying to select the above mentioned gears requires significant extra force, unless I wait a few seconds before trying to select the gear (allowing the revs to drop to idle). 6th gear is especially bad and makes an unhealthy grinding sound if I don't wait for the rpm to drop. Once the gear is selected I can bring the clutch up normally and it is fine. The issue is not present when the car is stationary - I can freely select any gear with the clutch down with no issues whatsoever. Apparently a specialist has had the gearbox apart while diagnosing another issue I had and found no problems.. Have they missed something and it is in fact worn synchros? Or can anyone think of any other potential causes? Transmission fluid will have been changed when they put the gearbox back together, so that shouldn't be the issue?? It's an 07, but it's a DE, do I assume that it doesn't have the lastest CD009 tranny? Anyone know which one it does have? Cheers ~Strudul Edited November 2, 2016 by Strudul Quote Link to comment Share on other sites More sharing options...
coldel Posted November 2, 2016 Share Posted November 2, 2016 Usually synchros, quite a lot of threads on this issue already reported, have a search (either via google or via the search button top left) and you should turn up all the previous discussion on this. 1 Quote Link to comment Share on other sites More sharing options...
KyleR Posted November 2, 2016 Share Posted November 2, 2016 Sounds like synchro to me. Quite worrying that a "specialist" seen nothing wrong, though. 1 Quote Link to comment Share on other sites More sharing options...
coldel Posted November 2, 2016 Share Posted November 2, 2016 Sometimes a gear oil change (use Nissan oil) along with some molyslip can help - but sounds something a bit more substantial to me? 2 Quote Link to comment Share on other sites More sharing options...
Juggalo Posted November 2, 2016 Share Posted November 2, 2016 I'd bet the farm on synchros. Common problem. Try another specialist. 1 Quote Link to comment Share on other sites More sharing options...
zippypooz Posted November 2, 2016 Share Posted November 2, 2016 As Coldel said, oil change, molyslip should help. Zeds arnt the best when it comes to smooth gearing. 1 Quote Link to comment Share on other sites More sharing options...
Strudul Posted November 2, 2016 Author Share Posted November 2, 2016 Thanks for replies. Made some edits in bold. Quote Link to comment Share on other sites More sharing options...
KyleR Posted November 2, 2016 Share Posted November 2, 2016 Thanks for replies. Made some edits in bold. Could be the wrong fluid and is it a RevUp DE or pre facelift? RevUp may have the updated box, the only way to know is to find the part number on it. 1 Quote Link to comment Share on other sites More sharing options...
Strudul Posted November 2, 2016 Author Share Posted November 2, 2016 Could be the wrong fluid and is it a RevUp DE or pre facelift? RevUp may have the updated box, the only way to know is to find the part number on it. Think they used the official Nissan stuff (saw a bottle of it). Pretty sure it's a Rev Up... My understanding is an 07 350Z can only be a HR or a RevUp DE. Since the redline is 7k and it doesn't have the bonnet bulge of an HR, I'm assuming it's a RevUp DE? Quote Link to comment Share on other sites More sharing options...
KyleR Posted November 3, 2016 Share Posted November 3, 2016 Could be the wrong fluid and is it a RevUp DE or pre facelift? RevUp may have the updated box, the only way to know is to find the part number on it. Think they used the official Nissan stuff (saw a bottle of it). Pretty sure it's a Rev Up... My understanding is an 07 350Z can only be a HR or a RevUp DE. Since the redline is 7k and it doesn't have the bonnet bulge of an HR, I'm assuming it's a RevUp DE? RevUp's redline at 7k, HR's at 7500 and have the bulge bonnet and dual intakes. DE RevUp will have the LED rear lights, better looking BiXenon fronts and updated interior with the hazard switch in front of the gearstick rather than near your elbow. So looks like you may or may not have the updated box, only way to find out is to check. 1 Quote Link to comment Share on other sites More sharing options...
Strudul Posted November 3, 2016 Author Share Posted November 3, 2016 So I had an update from the garage confirming the work they carried out. - The Workshop Foreman and the Senior Technician who carried out the repairs both confirm that they had no synchromesh issues with the gearbox that they would consider a requirement to replace any parts at the time of their road testing over a considerable distance. - The gearbox was inspected by both a specialist and the RAC after it was stripped. - The gear box oil has been replaced. So, a couple more questions: - Is there any chance it could be anything else that wouldn't be obvious during an inspection? Surely if the synchros are worn there should be metal particles in the oil and obvious wear on the synchros? If the problem is the gear itself, again, shouldn't there be obvious wear? - Could it possibly be driver error? I don't see how this could be the case though, since I don't have issues in other gears. Any ideas? Cheers Quote Link to comment Share on other sites More sharing options...
fishfire Posted November 3, 2016 Share Posted November 3, 2016 Much the same issues with mine. A local gearbox specialist said it's likely the syncros,and that opinion was echoed on the forum. I changed out 3rd up, including reverse and my 'box is now silky smooth! Don't bother with nissan UK for parts as you'll need a small mortgage. I got mine from Concept Zed Performance in the states. Even with shipping fees it was less than half what nissan UK were quoting me!! 2 Quote Link to comment Share on other sites More sharing options...
Juggalo Posted November 4, 2016 Share Posted November 4, 2016 So I had an update from the garage confirming the work they carried out. - The Workshop Foreman and the Senior Technician who carried out the repairs both confirm that they had no synchromesh issues with the gearbox that they would consider a requirement to replace any parts at the time of their road testing over a considerable distance. - The gearbox was inspected by both a specialist and the RAC after it was stripped. - The gear box oil has been replaced. So, a couple more questions: - Is there any chance it could be anything else that wouldn't be obvious during an inspection? Surely if the synchros are worn there should be metal particles in the oil and obvious wear on the synchros? If the problem is the gear itself, again, shouldn't there be obvious wear? - Could it possibly be driver error? I don't see how this could be the case though, since I don't have issues in other gears. Any ideas? Cheers You could check the gearbox mounts, but that would likely have flagged up to the mechanic. I'd still put my money on the sychros, regardless. 1 Quote Link to comment Share on other sites More sharing options...
Strudul Posted November 4, 2016 Author Share Posted November 4, 2016 (edited) You could check the gearbox mounts, but that would likely have flagged up to the mechanic. I'd still put my money on the sychros, regardless. Considering that if I rev match or double de-clutch it goes in smoothly, I think you've gotta be right with synchros. Surely any other issue would still be present regardless of the above? Edited November 4, 2016 by Strudul Quote Link to comment Share on other sites More sharing options...
Strudul Posted November 8, 2016 Author Share Posted November 8, 2016 Quick question related to this, as far as 2nd is concerned, it almost feels as if it doesn't want to engage because I'm pushing too far left. I'm not pushing left with any excessive force (i think), but i can not pull down and engage 2nd, no matter how hard I try, unless I stop pushing left and let the stick come right a tad. Anyone got a similar issue or can think of a reason? Quote Link to comment Share on other sites More sharing options...
zippypooz Posted November 8, 2016 Share Posted November 8, 2016 Its quite common, the gearbox can be notchy. Does it get better as the car/gearbox warms up? Quote Link to comment Share on other sites More sharing options...
Strudul Posted November 8, 2016 Author Share Posted November 8, 2016 (edited) Its quite common, the gearbox can be notchy. Does it get better as the car/gearbox warms up? A little bit I guess, but not particularly. It does seem to be quite inconsistent, it doesn't get progressively better or worse, it's just... for lack of a better word... random Edited November 8, 2016 by Strudul Quote Link to comment Share on other sites More sharing options...
zippypooz Posted November 9, 2016 Share Posted November 9, 2016 Its quite common, the gearbox can be notchy. Does it get better as the car/gearbox warms up? A little bit I guess, but not particularly. It does seem to be quite inconsistent, it doesn't get progressively better or worse, it's just... for lack of a better word... random Did you try Molyslip? Quote Link to comment Share on other sites More sharing options...
Strudul Posted November 9, 2016 Author Share Posted November 9, 2016 Did you try Molyslip? I didn't try anything, i left it up to the garage. Based on past experience they don't see very competent, so I doubt they used any Molyslip. Quote Link to comment Share on other sites More sharing options...
zippypooz Posted November 9, 2016 Share Posted November 9, 2016 If it were me id grab some and see how it goes, if there's still a problem then id take it to a recommended garage near your location and see what they say. Quote Link to comment Share on other sites More sharing options...
Strudul Posted December 9, 2016 Author Share Posted December 9, 2016 Independent engineer from RMI test drove the car today at the request (and expense) of the dealer to give a verdict on whether there is a fault and what it might be. Should hopefully get the report through in a few days and we'll see if you guys were on the money with synchros. Didn't get to meet the chap, but apparently he owns an auto 350z. Wonder if it's someone on on here? Quote Link to comment Share on other sites More sharing options...
Ebized Posted December 9, 2016 Share Posted December 9, 2016 (edited) Expert opinion on here over the years have stressed the importance of using the correct gearbox oil from Nissan. And I have seen plenty of feedback where others have reported that the addition of Molyslip can work wonders. Your own doubts about the gearbox work carried out would, if it were me, tend to find out what oil was put in and if not Nisan's own to get it changed with the addition of the Molyslip. A relatively cheap way of seeing that cures the issues. Maybe completely unconnected, but given the gear selection difficulty just maybe the 'gate' under the gearlever is not quite correctly located - I had this issue once on the 370. Edited December 10, 2016 by Ebized Quote Link to comment Share on other sites More sharing options...
CLASSIX Posted December 10, 2016 Share Posted December 10, 2016 I recently added Moly to my box after reading about quite a few doing it on here, It really does make for a smoother change when its cold. Quote Link to comment Share on other sites More sharing options...
Toon Chris Posted December 10, 2016 Share Posted December 10, 2016 (edited) Maybe completely unconnected, but given the gear selection difficulty just maybe the 'gate' under the gearlever is not quite correctly located - I had this issue once on the 370. This is definitely worth a look. I heard (on the forum) that this can affect 5th/6th gear selection at least. If the box has been out then it seem a likely place to at least have a fiddle. Doesn't sound like it will help with 2nd though Edited December 10, 2016 by Toon Chris Quote Link to comment Share on other sites More sharing options...
Strudul Posted December 10, 2016 Author Share Posted December 10, 2016 Maybe completely unconnected, but given the gear selection difficulty just maybe the 'gate' under the gearlever is not quite correctly located - I had this issue once on the 370. This is definitely worth a look. I heard (on the forum) that this can affect 5th/6th gear selection at least. If the box has been out then it seem a likely place to at least have a fiddle. Doesn't sound like it will help with 2nd though Would it be obvious if it wasn't located correctly? And how do you go about checking? Quote Link to comment Share on other sites More sharing options...
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