Nissan 370Z Forum  

Help with Automatic Transmission issue

I'm kinda desperately looking for help with my 13' Z AT. I started to notice some issues about 1k km ago since I had Whiteline diff bushings installed. The problem

Go Back   Nissan 370Z Forum > Tech Area > Engine & Drivetrain

Reply
 
LinkBack Thread Tools Display Modes
Old 09-09-2020, 06:11 AM   #1 (permalink)
Base Member
 
Join Date: Feb 2019
Location: Poland
Posts: 13
Drives: 13' 370Z AT Platinum
Rep Power: 2
Bilazaurus is on a distinguished road
Default Help with Automatic Transmission issue

I'm kinda desperately looking for help with my 13' Z AT. I started to notice some issues about 1k km ago since I had Whiteline diff bushings installed. The problem is like this.

1. When on Drive(automatic) and coming to a stop it sometimes jerks slightly when AT is downshifting from 2nd to 1st. It's just noticeable, like pressing very slightly brake pedal. It does it about once per five downshifts and is rather irregular and only when car is warmed up. Only once it was very noticeable like a poorly executed MT downshift. I almost never downshift manually to 1st gear, and only in 10kmh range or so.

2. This worries me the most. When shifting from Drive to Park it can shift violently. Sometimes noticably, sometimes it's very audible and jerks the car with a thump. Only once there was a very loud thump and once there was a thump when I was already on Reverse and reversed about one meter. The latter happened on cold, former on hot. It's more irregular than issue #1 and there is no rhyme no reason. Going from Park to Drive never produces any issue. It's smooth and inaudible.

3. Very rarely manual downshift from 4th to 3rd is slightly delayed

4. Going from 2nd to 1st (auto mode) produces a click sound. It's also audible when going from Drive to Park

5. Right away after installing Whiteline's diff bushings I noticed shifting being slightly harsher but I address it to harsher diff engagement due to harder bushings.

Otherwhise, my AT shifts fine and smoothly from 3rd to 4th and up. I don't experience any slippage and car accelerates as it should. Right away after installing Whiteline's diff bushings I noticed shifting being slightly harsher but I address it to harsher diff engagement due to harder bushings. I've changed AT oil about 200km ago and it didn't really help. The only mod that is worth mentioning in this situation, beside bushings, are more aggressive JUN exhaust camshafts. Could electronic AT valves be the culprit?
I'm sorry for creating another topic but I've searched through and through and couldn't spot identical issue. Thanks in advance.
Bilazaurus is offline   Reply With Quote
Old 09-09-2020, 06:39 PM   #2 (permalink)
Track Member
 
Join Date: Mar 2016
Location: San jose
Posts: 758
Drives: 2013 370z sport
Rep Power: 24
Jhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond repute
Default

I have a 13 with AT and z1 bushings and I’ve felt the 2 to 1 shift and also a 1 to 2 shift can be harsh at times (even triggers the ecutek knock indicator). It did these even before the bushing swap though and really the thing that helps the most is changing the fluid then it smooths out for a while. I’m not too sure there is any issue with yours and may just be normal as I’ve had others say the 1-2 shift can be a bit harsh.
Jhill is offline   Reply With Quote
Old 09-09-2020, 07:29 PM   #3 (permalink)
Base Member
 
Join Date: Feb 2019
Location: Poland
Posts: 13
Drives: 13' 370Z AT Platinum
Rep Power: 2
Bilazaurus is on a distinguished road
Default

Are you talking about AT mount bushings or diff bushings? Did you experience the thump as I'm sometimes experiencing?
Bilazaurus is offline   Reply With Quote
Old 09-10-2020, 09:33 PM   #4 (permalink)
Track Member
 
Join Date: Mar 2016
Location: San jose
Posts: 758
Drives: 2013 370z sport
Rep Power: 24
Jhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond reputeJhill has a reputation beyond repute
Default

Quote:
Originally Posted by Bilazaurus View Post
Are you talking about AT mount bushings or diff bushings? Did you experience the thump as I'm sometimes experiencing?
Iím not sure if Iíd call it a thump but itís an obvious harsh shift sometimes. Yes itís the diff bushing but like I said it did it before so thatís not the issue.
Jhill is offline   Reply With Quote
Old 09-15-2020, 05:37 AM   #5 (permalink)
Base Member
 
Join Date: Feb 2019
Location: Poland
Posts: 13
Drives: 13' 370Z AT Platinum
Rep Power: 2
Bilazaurus is on a distinguished road
Default

Thanks for your reply. I'm mostly worried about reverse. Anyone experienced something similiar?
Bilazaurus is offline   Reply With Quote
Old 09-16-2020, 03:48 AM   #6 (permalink)
A True Z Fanatic
 
Quicksilvers's Avatar
 
Join Date: May 2017
Location: Atlanta, GA
Posts: 1,779
Drives: 2017 370z
Rep Power: 22102
Quicksilvers has a reputation beyond reputeQuicksilvers has a reputation beyond reputeQuicksilvers has a reputation beyond reputeQuicksilvers has a reputation beyond reputeQuicksilvers has a reputation beyond reputeQuicksilvers has a reputation beyond reputeQuicksilvers has a reputation beyond reputeQuicksilvers has a reputation beyond reputeQuicksilvers has a reputation beyond reputeQuicksilvers has a reputation beyond reputeQuicksilvers has a reputation beyond repute
Default

Quote:
Originally Posted by Bilazaurus View Post
I'm kinda desperately looking for help with my 13' Z AT. I started to notice some issues about 1k km ago since I had Whiteline diff bushings installed. The problem is like this.

1. When on Drive(automatic) and coming to a stop it sometimes jerks slightly when AT is downshifting from 2nd to 1st. It's just noticeable, like pressing very slightly brake pedal. It does it about once per five downshifts and is rather irregular and only when car is warmed up. Only once it was very noticeable like a poorly executed MT downshift. I almost never downshift manually to 1st gear, and only in 10kmh range or so.

2. This worries me the most. When shifting from Drive to Park it can shift violently. Sometimes noticably, sometimes it's very audible and jerks the car with a thump. Only once there was a very loud thump and once there was a thump when I was already on Reverse and reversed about one meter. The latter happened on cold, former on hot. It's more irregular than issue #1 and there is no rhyme no reason. Going from Park to Drive never produces any issue. It's smooth and inaudible.

3. Very rarely manual downshift from 4th to 3rd is slightly delayed

4. Going from 2nd to 1st (auto mode) produces a click sound. It's also audible when going from Drive to Park

5. Right away after installing Whiteline's diff bushings I noticed shifting being slightly harsher but I address it to harsher diff engagement due to harder bushings.

Otherwhise, my AT shifts fine and smoothly from 3rd to 4th and up. I don't experience any slippage and car accelerates as it should. Right away after installing Whiteline's diff bushings I noticed shifting being slightly harsher but I address it to harsher diff engagement due to harder bushings. I've changed AT oil about 200km ago and it didn't really help. The only mod that is worth mentioning in this situation, beside bushings, are more aggressive JUN exhaust camshafts. Could electronic AT valves be the culprit?
I'm sorry for creating another topic but I've searched through and through and couldn't spot identical issue. Thanks in advance.
Regarding your transmission this is normal operating. Leave your transmission in auto mode don’t manual shift your transmission. Let your transmission do it’s job in auto mode. First step would be to have your transmission fluid changed at a Nissan dealership service department you trust or transmission/driveline shop you trust if you are not able to change your transmission fluid yourself. Also it is possible your transmission fluid level could be lower than it should be. Give your transmission time to shift as well from park to drive etc. After your transmission fluid is changed you should notice somewhat of a difference. Have your Z diagnosed if necessary. Once you install polyurethane or solid differential bushings they will never be as quiet as the Genuine Nissan OEM hardened rubber liquid filled differential bushings it’s the nature of beast.
__________________
Mr. Clean
Quicksilvers is offline   Reply With Quote
Reply

Bookmarks

Tags
7 at, automatic, jerk

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
370 automatic transmission issue goon94 Engine & Drivetrain 1 08-17-2020 06:33 PM
Automatic transmission New370z Engine & Drivetrain 2 12-02-2017 11:25 AM
2010 Automatic transmission issue... plato Engine & Drivetrain 11 12-10-2013 10:49 PM
automatic transmission oil dipstick?? lkc81 Engine & Drivetrain 23 07-02-2010 07:29 PM
Automatic Transmission Zaku Nissan 370Z General Discussions 19 06-30-2009 01:48 PM


All times are GMT -5. The time now is 02:26 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 PL2