Clunk/thunk on 6-5 coasting downshift. - Page 13 - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee SRT - WK2 > WK2 SRT General Discussion > Trouble Shooting/Problems/Service

Reply
 
Thread Tools Display Modes
 
  #145  
Old 04-15-2015, 07:45 PM
Member
My Jeep: 2015 6.4L WK2
 
Join Date: Oct 2014
Posts: 420
Thanks: 16
Thanked 73 Times in 59 Posts
Rep Power: 1401
rlarsen462 is on a distinguished road
Re: Clunk/thunk on 6-5 coasting downshift.

I won't lie, now that the die is cast for the buy back I have been flogging the $&#! out of mine. Probably enjoying it more now than I did when I bought it...

Reply With Quote
The Following User Says Thank You to rlarsen462 For This Useful Post:
Sponsored Links
Advertisement
 
  #146  
Old 04-15-2015, 07:50 PM
Jsboening's Avatar
Senior Member
My Jeep: 2015 6.4L SRT WK2
 
Join Date: Nov 2014
Location: Rockford, MI
Posts: 1,164
Thanks: 195
Thanked 288 Times in 221 Posts
Rep Power: 2737
Jsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond repute
Re: Clunk/thunk on 6-5 coasting downshift.

Me too. I let my son get in it tonight with muddy soccer cleats. 😈😵. I have to get the diff leak fixed before they'll let it out on the racetrack. I'm going to beat it like a rented mule.


Sent from my iPhone using JeepGarage
Reply With Quote
The Following User Says Thank You to Jsboening For This Useful Post:
  #147  
Old 04-15-2015, 07:52 PM
Jsboening's Avatar
Senior Member
My Jeep: 2015 6.4L SRT WK2
 
Join Date: Nov 2014
Location: Rockford, MI
Posts: 1,164
Thanks: 195
Thanked 288 Times in 221 Posts
Rep Power: 2737
Jsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond repute
Re: Clunk/thunk on 6-5 coasting downshift.

Oh and I tried launch control for the first time today. 0-60 in 4.3 with two adult children. Lol. It was a blast.


Sent from my iPhone using JeepGarage
Reply With Quote
Sponsored Links
Advertisement
 
  #148  
Old 04-15-2015, 07:58 PM
Member
My Jeep: 2014 6.4L SRT8 WK2
 
Join Date: Jul 2014
Location: Las Vegas, NV
Posts: 233
Thanks: 10
Thanked 25 Times in 22 Posts
Rep Power: 1316
theweavman is on a distinguished road
Re: Clunk/thunk on 6-5 coasting downshift.

14 SRT, no clunk, but two valve bodies, and all up dates, have not cured the draging down shifts, now seems the worst around 4-3, used to be 6-5,......not happy but I don't think Chrysler has a real fix yet, sounds like the 15's are just as bad, and maybe even worse with their clunks.....
__________________
So it is written, So shall it be done !
Theweavman
Reply With Quote
  #149  
Old 04-15-2015, 07:59 PM
Jsboening's Avatar
Senior Member
My Jeep: 2015 6.4L SRT WK2
 
Join Date: Nov 2014
Location: Rockford, MI
Posts: 1,164
Thanks: 195
Thanked 288 Times in 221 Posts
Rep Power: 2737
Jsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond repute
Re: Clunk/thunk on 6-5 coasting downshift.

Does the dragging downshift feel like rev-matching?


Sent from my iPhone using JeepGarage
Reply With Quote
  #150  
Old 04-15-2015, 08:28 PM
Member
My Jeep: 2014 6.4L SRT8 WK2
 
Join Date: Jul 2014
Location: Las Vegas, NV
Posts: 233
Thanks: 10
Thanked 25 Times in 22 Posts
Rep Power: 1316
theweavman is on a distinguished road
Re: Clunk/thunk on 6-5 coasting downshift.

here is how I would describe my dragging downshifts, normal speeds, remove your foot from the gas pedal to slow down for a stop light etc. sometimes my Jeep stays in it's current gear until you come to a stop them it drops down to 1st. Other times soon as I remove my foot from the gas, it starts slowing and downshifting, feels almost like the brakes are being applied, and some of the downshifts feel like someone is stabbing the brake pedal as the trans drops to a lower gear.....even coasting down a grade, the vehicle slows on it's own, tried putting it in neutral, doesn't occur, so it's not the brakes dragging or anything else in my drive train, feels kinda like a manual transmission that you downshifted too early and when you popped out the clutch the vehicle bucked forward and slowed too much....just about every other auto trans I've ever driven, stays in whatever gear it was in when you let off the gas, unless acted upon, by braking, acceleration, or manual shifting....My jeep decides to downshift on its own when taking my foot off the gas, dragging down my coasting or braking speed, very strange sensation, kinda lurches you forward
__________________
So it is written, So shall it be done !
Theweavman
Reply With Quote
  #151  
Old 04-15-2015, 08:29 PM
Member
My Jeep: 2015 6.4L WK2
 
Join Date: Oct 2014
Posts: 420
Thanks: 16
Thanked 73 Times in 59 Posts
Rep Power: 1401
rlarsen462 is on a distinguished road
Re: Clunk/thunk on 6-5 coasting downshift.

Is there someone that has claimed that the rough downshifting is rev matching? Because I had an Audi RS5 that rev matched downshifts with its dual clutch tranny (completely different unit obviously) and it was super smooth and had a raucous throttle blip to boot. I am not very experienced with performance automatics, is it possible it's actually doing this on purpose? The clunk remains unacceptable but I might be able to live with some roughness if there was a performance advantage...kind of late in the game for this revelation if so lol. Besides I would have thought the engineer that looked at my truck would have dismissed it quickly if it was by design rev matching.
Reply With Quote
  #152  
Old 04-15-2015, 08:39 PM
Jsboening's Avatar
Senior Member
My Jeep: 2015 6.4L SRT WK2
 
Join Date: Nov 2014
Location: Rockford, MI
Posts: 1,164
Thanks: 195
Thanked 288 Times in 221 Posts
Rep Power: 2737
Jsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond reputeJsboening has a reputation beyond repute
Re: Clunk/thunk on 6-5 coasting downshift.

I believe there is some rev matching, especially when in track mode. I'd have to say mine has some drag to it as well. I don't find mine objectionable and rather like it. It doesn't feel like a lazy old Ford AOD(automatic overdrive). If it weren't for the darn 6-5 clunk I'd be a happy camper.


Sent from my iPhone using JeepGarage
Reply With Quote
  #153  
Old 04-15-2015, 08:58 PM
Member
My Jeep: 2014 6.4L SRT8 WK2
 
Join Date: Jul 2014
Location: Las Vegas, NV
Posts: 233
Thanks: 10
Thanked 25 Times in 22 Posts
Rep Power: 1316
theweavman is on a distinguished road
Re: Clunk/thunk on 6-5 coasting downshift.

I wouldn't discribe it as rev matching, it feels more like my trans isn't sure what gear it really want to shift into, so it kinda hangs up my car while it figures it out and makes its shift, be nice if there were an easy consistsnt way to discribe this
Reply With Quote
  #154  
Old 04-15-2015, 09:03 PM
Member
My Jeep: 2015 6.4L WK2
 
Join Date: Oct 2014
Posts: 420
Thanks: 16
Thanked 73 Times in 59 Posts
Rep Power: 1401
rlarsen462 is on a distinguished road
Re: Clunk/thunk on 6-5 coasting downshift.

I have noticed that it will stay in high gear if you were just hammering on it and let off abruptly, but my Dodge 1500 with the same transmission (5.7L Hemi) did the same thing...which might be as designed because if you let off abruptly you either A) want the high transmission drag to aid in a quick stop or B) might want to get right back on the throttle in which case you might not want to wait for a downshift. Feels weird at first though.
Reply With Quote
  #155  
Old 04-15-2015, 09:16 PM
Member
 
Join Date: Nov 2011
Location: Huntsville, AL
Posts: 988
Thanks: 48
Thanked 107 Times in 89 Posts
Rep Power: 39295
bmrisko has a reputation beyond reputebmrisko has a reputation beyond reputebmrisko has a reputation beyond reputebmrisko has a reputation beyond reputebmrisko has a reputation beyond reputebmrisko has a reputation beyond reputebmrisko has a reputation beyond reputebmrisko has a reputation beyond reputebmrisko has a reputation beyond reputebmrisko has a reputation beyond reputebmrisko has a reputation beyond repute
Re: Clunk/thunk on 6-5 coasting downshift.

Mine definitely feels like rev matching...more pronounced in sport mode. I figured it was normal for the vehicle and it doesn't bother me too much. The "rev matching" is still present after the 2015 flash, but the extreme 6-5 downshift is gone. I believe it may be normal as it really cuts down on braking.
__________________
2015 WK2 SRT - Billet Silver
Previous Jeeps - '12 WK2 Overland, '99 WJ, '96 ZJ, '93 ZJ (Caged & locked on 35s)
Reply With Quote
  #156  
Old 04-15-2015, 10:07 PM
srtwannabe's Avatar
Member
 
Join Date: Jan 2013
Posts: 324
Thanks: 186
Thanked 93 Times in 59 Posts
Rep Power: 1937
srtwannabe is on a distinguished road
Re: Clunk/thunk on 6-5 coasting downshift.

Quote:
Originally Posted by theweavman View Post
here is how I would describe my dragging downshifts, normal speeds, remove your foot from the gas pedal to slow down for a stop light etc. sometimes my Jeep stays in it's current gear until you come to a stop them it drops down to 1st. Other times soon as I remove my foot from the gas, it starts slowing and downshifting, feels almost like the brakes are being applied, and some of the downshifts feel like someone is stabbing the brake pedal as the trans drops to a lower gear.....even coasting down a grade, the vehicle slows on it's own, tried putting it in neutral, doesn't occur, so it's not the brakes dragging or anything else in my drive train, feels kinda like a manual transmission that you downshifted too early and when you popped out the clutch the vehicle bucked forward and slowed too much....just about every other auto trans I've ever driven, stays in whatever gear it was in when you let off the gas, unless acted upon, by braking, acceleration, or manual shifting....My jeep decides to downshift on its own when taking my foot off the gas, dragging down my coasting or braking speed, very strange sensation, kinda lurches you forward

Exactly what I feel, couldn't put it better.
Reply With Quote
Reply

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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Getting tired of my 1st to 2nd gear clunk when coasting vertrkr 2011+ Dodge Durango-WD 13 04-16-2014 05:56 AM
Thunk when upshifting hammer1234 Trouble Shooting/Problems/Service 1 06-09-2011 10:50 AM
The typical rear-end "thunk" TJXJWJ Troubleshooting/Problems 14 06-06-2011 06:20 PM
Trasmission downshift gc4x4 Grand Cherokee - WK 3 05-22-2010 05:56 PM
Rear end knock/thunk/vibration '02 WJ esritz@yahoo.com Troubleshooting/Problems 1 01-20-2010 10:17 AM

» Premium Vendor Showcase
Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 09:46 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.