Shaking while driving

SlowbaltSS · February 4th, 2011, 07:26 AM

I have a 1999 Mustang v6 with the 4-speed auto. I noticed for a long time now that when I reach 40 mph, the rpms stay at about 1200 and the car creeps in terms of acceleration, there is also a vibration. This happens until 50 mph and it only happens in 4th gear. The only way I can effectively accelerate is if I push the gas pedal down until the car down shifts into 3rd. This is now a major problem as most of my commuting is at 45mph. I cleaned out my IAC and MAF with throttle body cleaner, no improvement. Any ideas what could be wrong?

Tang Stang · February 4th, 2011, 09:25 AM

From those symptoms, it sounds like torque converter shudder. How many miles are on the car, and when was the transmission fluid/filter changed last? Have you checked the trans fluid level? Is the fluid burnt at all?

SlowbaltSS · February 4th, 2011, 10:44 AM

Originally Posted by Tang Stang

From those symptoms, it sounds like torque converter shudder. How many miles are on the car, and when was the transmission fluid/filter changed last? Have you checked the trans fluid level? Is the fluid burnt at all?

I dont recall the exact date, but within a year ago I had the tranny fluid changed. The mechanic said that if the fluid was burnt or something, changing it would do more harm than good, but he said it was ok to change and did that. And the engine has a little less than 120k. I try to make it a habit to check my fluids every month, haven't checked yet for February I'll take a look.

Tang Stang · February 4th, 2011, 10:46 AM

And as for the other questions?

SlowbaltSS · February 4th, 2011, 10:53 AM

Nope, trans fluid is clean and full. I think my car is just a lemon. A sun-bleached, black, one wheel drive lemon.

6ixer · February 4th, 2011, 11:23 AM

My car did tht only because when I had my old-er mustang (97) it was also and auto and the shift point for 3rd/4th was approx 40/45mphit would shift into 4th then "bogg" down a little mabe shake a little but thts because again when my auto shifted into 4th it was oly doing slightly and I mean slighty pver 1k rpms so I said eff it and took it out of o/d till about 50....the shift point in all the autos I drove sucked D***

Just saying and my .02

SlowbaltSS · February 4th, 2011, 11:54 AM

Originally Posted by 6ixer

My car did tht only because when I had my old-er mustang (97) it was also and auto and the shift point for 3rd/4th was approx 40/45mphit would shift into 4th then "bogg" down a little mabe shake a little but thts because again when my auto shifted into 4th it was oly doing slightly and I mean slighty pver 1k rpms so I said eff it and took it out of o/d till about 50....the shift point in all the autos I drove sucked D***

Just saying and my .02

Which is why my next car will be a Mazdaspeed 6 or a 04 Mustang Mach 1 (Manual).

Bobby00000 · November 19th, 2011, 01:26 PM

My 99 did exactly what your talking about, buy some dr tranny from Oreileys its like 7 bucks add that where your transmission fluid goes and that will fix the shudder in the torque converter temporarily, that stuff really does work wonders!! I went and had my transmission switched out and ever since i did that i havent had a problem, i would advise doing this if you plan on keeping the car, i got my transmission for 100 bucs and paid some jackwagons who messed up and caused mine to leak which was 200 then another 150 to fix their screw up but other people quoted me 150 to do a transmission swap, i know around here ive seen transmissions for 150 - 200 so if you get it done right you could be looking at 300 - 400 for a transmission and a swap, i ended up paying over 500 cause my guys jacked it up and didnt replace my o ring on the dipstick and all my gasgets. hope this helps man

xtreme 2 · November 21st, 2011, 09:58 AM

Could it be that you just have a slow V6 and you are in overdrive at 45 mph?

GreenMustang00 · November 21st, 2011, 03:18 PM

This thread is old news

xtreme 2 · November 21st, 2011, 04:01 PM

wow, I gotta start looking at the dates of the guy that posted before the guy that last posted...

SlowbaltSS · January 2nd, 2012, 11:56 PM

That car is my younger brother's problem now :p

February 4th, 2011, 07:26 AM	#1
SlowbaltSS Ain'tNobodyGotTimeForThat 2004 Mach 1 Join Date: Feb 2011 Location: Indiana Posts: 633 iTrader: 0 reviews	Shaking while driving I have a 1999 Mustang v6 with the 4-speed auto. I noticed for a long time now that when I reach 40 mph, the rpms stay at about 1200 and the car creeps in terms of acceleration, there is also a vibration. This happens until 50 mph and it only happens in 4th gear. The only way I can effectively accelerate is if I push the gas pedal down until the car down shifts into 3rd. This is now a major problem as most of my commuting is at 45mph. I cleaned out my IAC and MAF with throttle body cleaner, no improvement. Any ideas what could be wrong?

February 4th, 2011, 09:25 AM	#2
Tang Stang Hardcore Enthusiast 2004 Mustang GT Join Date: Sep 2010 Location: Imperial, MO Posts: 1,961 iTrader: 2 reviews	From those symptoms, it sounds like torque converter shudder. How many miles are on the car, and when was the transmission fluid/filter changed last? Have you checked the trans fluid level? Is the fluid burnt at all? __________________ Rod @ AzzKicker Cars 2004 Ford Mustang GT-The Driver-BBK CAI, PP TB & Inlet, Steeda UD's, SLP LM1, & 3.73's. 1990 Mercury Cougar XR7-The Meth Addict-5.0L DOHC Stroker w/2.1L KB SC. 1995 Ford F150-Mud Toy-5.0L, 4x4, 33's, & Warn 8274 Winch

February 4th, 2011, 10:46 AM	#4
Tang Stang Hardcore Enthusiast 2004 Mustang GT Join Date: Sep 2010 Location: Imperial, MO Posts: 1,961 iTrader: 2 reviews	And as for the other questions? __________________ Rod @ AzzKicker Cars 2004 Ford Mustang GT-The Driver-BBK CAI, PP TB & Inlet, Steeda UD's, SLP LM1, & 3.73's. 1990 Mercury Cougar XR7-The Meth Addict-5.0L DOHC Stroker w/2.1L KB SC. 1995 Ford F150-Mud Toy-5.0L, 4x4, 33's, & Warn 8274 Winch

February 4th, 2011, 11:23 AM	#6
6ixer Hardcore Enthusiast 2000 mustang v6 14.6@99.68 Join Date: Apr 2010 Location: east greenbush, ny Posts: 1,567 Blog Entries: 3 iTrader: 0 reviews	My car did tht only because when I had my old-er mustang (97) it was also and auto and the shift point for 3rd/4th was approx 40/45mphit would shift into 4th then "bogg" down a little mabe shake a little but thts because again when my auto shifted into 4th it was oly doing slightly and I mean slighty pver 1k rpms so I said eff it and took it out of o/d till about 50....the shift point in all the autos I drove sucked D*** Just saying and my .02 __________________ Ported heads, comp cams cam, AM CAI, posi'd rear with 3.73 gears, flowmaster exhaust Fixed clutch!!!!! "My mustang likes a good ol' fashion bowl of rice....especially fried"

November 21st, 2011, 09:58 AM	#9
xtreme 2 Hardcore Enthusiast 2001 v6 premium Join Date: Nov 2008 Location: Tulsa, OK Posts: 1,340 Blog Entries: 1 iTrader: 0 reviews	Could it be that you just have a slow V6 and you are in overdrive at 45 mph? __________________ Screw it, coming to play with the big boys... 5.4L Vortech COMING SOON!

February 4th, 2011, 10:53 AM	#5
SlowbaltSS Ain'tNobodyGotTimeForThat 2004 Mach 1 Join Date: Feb 2011 Location: Indiana Posts: 633 iTrader: 0 reviews	Nope, trans fluid is clean and full. I think my car is just a lemon. A sun-bleached, black, one wheel drive lemon.

November 19th, 2011, 01:26 PM	#8
Bobby00000 Regular 1999 Mustang 35th edition Join Date: Oct 2011 Location: North Carolina Posts: 165 iTrader: 0 reviews	My 99 did exactly what your talking about, buy some dr tranny from Oreileys its like 7 bucks add that where your transmission fluid goes and that will fix the shudder in the torque converter temporarily, that stuff really does work wonders!! I went and had my transmission switched out and ever since i did that i havent had a problem, i would advise doing this if you plan on keeping the car, i got my transmission for 100 bucs and paid some jackwagons who messed up and caused mine to leak which was 200 then another 150 to fix their screw up but other people quoted me 150 to do a transmission swap, i know around here ive seen transmissions for 150 - 200 so if you get it done right you could be looking at 300 - 400 for a transmission and a swap, i ended up paying over 500 cause my guys jacked it up and didnt replace my o ring on the dipstick and all my gasgets. hope this helps man

November 21st, 2011, 03:18 PM	#10
GreenMustang00 1 Wheel Peel 2000 Mustang 393w 2001 Mustang GT Vert Join Date: Mar 2010 Location: Wisconsin Posts: 3,583 iTrader: 4 reviews	This thread is old news __________________ 2000 393w Swapped Vert 2001 GT Vert 2002 Six Banger

November 21st, 2011, 04:01 PM	#11
xtreme 2 Hardcore Enthusiast 2001 v6 premium Join Date: Nov 2008 Location: Tulsa, OK Posts: 1,340 Blog Entries: 1 iTrader: 0 reviews	wow, I gotta start looking at the dates of the guy that posted before the guy that last posted... __________________ Screw it, coming to play with the big boys... 5.4L Vortech COMING SOON!

January 2nd, 2012, 11:56 PM	#12
SlowbaltSS Ain'tNobodyGotTimeForThat 2004 Mach 1 Join Date: Feb 2011 Location: Indiana Posts: 633 iTrader: 0 reviews	That car is my younger brother's problem now :p

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