2006 mustang GT manual transmission backlash - Ford Mustang Forum
 
LinkBack Thread Tools
post #1 of 10 (permalink) Old 06-25-2012 Thread Starter
Rookie
 
H77drk's Avatar
 
Joined: Jun 2012
Location: Montreal
Posts: 8
 
Smile 2006 mustang GT manual transmission backlash

Hi all
This is my very first post. I am worried about the backlash that gives the mustang a clunk sound when changing gears specially from 1st to 2nd from a stop. Is it normal to have this CLUNK sound if i dont dosage the clutch / gas properly. If i release the clutch less abruply i dont have the thump. But if i release the clutch bit too quick i hear the clunk / backlash and am afraid i am damaging the transmission. Is this normal or i only need to get used to my new 2 weeks old car. Thanks
H77drk is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 06-26-2012
GT Member
V6 Member
S197 Member
 
ShortySmalls's Avatar
 
Joined: Oct 2011
Location: Camdenton
Posts: 1,356
 
That's the 2 piece drive shaft making that sound

Sent from my Desire HD using Tapatalk 2

2012 Race Red 3.7L MT82 - Roush Axle-Back Exhaust and Airaid Cold Air Intake
ShortySmalls is offline  
post #3 of 10 (permalink) Old 06-26-2012
Apprentice
5.0L Member
S197 Member
 
Ford-a-Tude's Avatar
 
Joined: Dec 2009
Location: Chicago
Posts: 98
 
There are a few things in addition to the driveshaft that can clunk. Is everything else on the vehicle stock? Any upgraded suspension components?
There could be a worn bushing in one of the rear control arms or a bolt that has loosened up slightly over the years. I have an 06 as well and I would occasionally get a clunk. It really shouldn't be happening all that often.

Ford-a-Tude
Ford-a-Tude is offline  
post #4 of 10 (permalink) Old 06-26-2012
BOSS Member
4.6L Member
S197 Member
 
JBert's Avatar
 
Joined: Jan 2011
Location: Douglas
Posts: 4,714
 
most likely it is "normal", nothing to worry about and will not do any damage

like Ford-a-Tude said, it could be other things too -- but it sounds like you are describing "drive train lash" -- it is basically accumulated play from all the joints in the drive shaft and rear-end, and when you reverse the load on the driveshaft all that play comes out in one direction and then clunks in the other direction when you load it the other way again . . . if you get the technique down with the gas and clutch, you can avoid the loading/unloading and the clunking.

Here's what I think is happenning:
1) you are driving forward, the engine is loading the driveshaft "forward", all the play in the joints is taken out in the forward direction
2) when you go to shift, you let off on the gas just before you push in the clutch . . . so now the engine is pushing backwards on the driveshaft, and the play gets taken out in the "backwards" direction -- clunk! (most noticeable in low gears because that's where the engine braking is the strongest)
3) then you give it some gas and let out the clutch, the engine starts pushing on the driveshaft in the forward direction again, the play gets taken out in the forward direction . . . . clunk!

So, if this is really what is happening -- if you push the clutch in just a little sooner, before the engine braking can take the slack out backwards, you eliminate both clunks.

If it is really bad it probably means something is really worn out somewhere in the drivshaft so there is a lot of play and a lot of clunking.

| 2010 GT coupe | Daily Driver with some Steeda and GT500 take-off stuff for the occasional track day
JBert is offline  
post #5 of 10 (permalink) Old 06-27-2012
PONY Member
S197 Member
 
joe_momma's Avatar
 
Joined: Jun 2012
Location: Rocky Top
Posts: 478
 
Sounds like standard drivetrain noise to me. I think every manual tranny car I've had has done this to some extent.
joe_momma is offline  
post #6 of 10 (permalink) Old 06-27-2012
ski
GT Member
S197 Member
 
ski's Avatar
 
Joined: Dec 2004
Location: Northeast
Posts: 1,586
 
My manual 05 GT has been making that same noise for the past 7.5 years w/o any drivetrain problems.
ski is offline  
post #7 of 10 (permalink) Old 07-01-2012 Thread Starter
Rookie
 
H77drk's Avatar
 
Joined: Jun 2012
Location: Montreal
Posts: 8
 
Quote:
Originally Posted by Ford-a-Tude View Post
There are a few things in addition to the driveshaft that can clunk. Is everything else on the vehicle stock? Any upgraded suspension components?
There could be a worn bushing in one of the rear control arms or a bolt that has loosened up slightly over the years. I have an 06 as well and I would occasionally get a clunk. It really shouldn't be happening all that often.
Bought it second hand. So dont know about suspensions if changed or not
Thx.
H77drk is offline  
post #8 of 10 (permalink) Old 07-01-2012 Thread Starter
Rookie
 
H77drk's Avatar
 
Joined: Jun 2012
Location: Montreal
Posts: 8
 
Quote:
Originally Posted by JBert View Post
most likely it is "normal", nothing to worry about and will not do any damage

like Ford-a-Tude said, it could be other things too -- but it sounds like you are describing "drive train lash" -- it is basically accumulated play from all the joints in the drive shaft and rear-end, and when you reverse the load on the driveshaft all that play comes out in one direction and then clunks in the other direction when you load it the other way again . . . if you get the technique down with the gas and clutch, you can avoid the loading/unloading and the clunking.

Here's what I think is happenning:
1) you are driving forward, the engine is loading the driveshaft "forward", all the play in the joints is taken out in the forward direction
2) when you go to shift, you let off on the gas just before you push in the clutch . . . so now the engine is pushing backwards on the driveshaft, and the play gets taken out in the "backwards" direction -- clunk! (most noticeable in low gears because that's where the engine braking is the strongest)
3) then you give it some gas and let out the clutch, the engine starts pushing on the driveshaft in the forward direction again, the play gets taken out in the forward direction . . . . clunk!

So, if this is really what is happening -- if you push the clutch in just a little sooner, before the engine braking can take the slack out backwards, you eliminate both clunks.

If it is really bad it probably means something is really worn out somewhere in the drivshaft so there is a lot of play and a lot of clunking.
Thanks Jbert for this helpful post. This is the. Best explanation. I thoght it would be a matter of getting used to the right cluth / gas combination. Should TCS be off or on during everyday driving ? When the light is off means TCS is off or on ? Not sure. Thx
H77drk is offline  
post #9 of 10 (permalink) Old 07-02-2012
BOSS Member
4.6L Member
S197 Member
 
JBert's Avatar
 
Joined: Jan 2011
Location: Douglas
Posts: 4,714
 
Quote:
Originally Posted by H77drk View Post
. . . . Should TCS be off or on during everyday driving ? When the light is off means TCS is off or on ? Not sure. Thx
you're welcome . . . TCS is personal preference -- I usually leave it alone (meaning on) but some people are in the habit of turning it off

I believe the car thinks it should be ON, so the warning light on the dash illuminates when it is OFF

| 2010 GT coupe | Daily Driver with some Steeda and GT500 take-off stuff for the occasional track day
JBert is offline  
GT Member
4.6L Member
S197 Member
 
markag's Avatar
 
Joined: May 2009
Location: Metamora
Posts: 1,117
 
I just leave my TCS on unless I'm goign to intentionally be spinning the tires. However, if I were to race it (Drag, auto X, open track, etc) I would turn it off so the computer doesn't pull power out when wheelspin occurs. Everyday driving, I just leave it on.

2008 Mustang GT Deluxe, Black, Manual Transmission, Black Cloth Interior
Show: Katzkin Leather Interior, Matte Black 10" Stripes, NXT Step Performance Axlebacks, Pypes M80 Mufflers (mid mounted), CDC Sequential Tail Lights, 14" Shorty Antenna, Ford OEM Plenum Cover, Ford Semigloss Black Painted Valve Covers, Leather Wrapped OEM Steering Wheel
Go: Airaid Race CAI, BAMA Tune, J&M Lower Control Arms, JLT Oil Separator
Coming Soon: Motive 4.10 gears
markag is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a VALID email address for yourself, otherwise you will not receive the necessary confirmation email needed to confirm, validate and activate your new AFM member account.

Failure to provide a VALID email address, will result in the cancellation of your new AFM member account registration.

Email Address:
OR

Log-in









Random Question

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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

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

 
For the best viewing experience please update your browser to Google Chrome


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183