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Author
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Topic: Driveline Shudder
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VonYount
Journeyman Posts: 96
From: San Francisco, CA, USA
Registered: Jul 2000
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posted 07-22-2001 12:07 PM
   
Okay,So when I'm cruising above about 1500rpm, I get a bad shudder in the driveline when I give it a certain small amount of throttle... --Give it a lot of throttle, no shudder...
--Completely let off the throttle, no shudder...
It's only at that certain throttle point and I can't figure out why...
-Ryan
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'66 Mustang Coupe
--351W
--black spot primer
--steel wheels
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SteveLaRiviere
Administrator Posts: 24286
From: Saco, Maine Toys: '70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150
Registered: May 99
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posted 07-22-2001 01:59 PM
Vibrations always have a certain speed where they are most pronounced. Has the driveshaft been off recently? You could try turning it 180 degrees and see if that helps. ------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
Ford. The closer you look, the better WE look!
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mellowyellow
Gearhead Posts: 4608
From: So. Fl.
Registered: Aug 2000
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posted 07-22-2001 02:58 PM
My 65 has a bad vibration over 85-90 mph. My thought is, Oh well. Guess I wont't go there anymore! I put 1000 miles on my engine, and one day, On Alligator Alley, I decided to see how fast it was. It had plenty left but the vibration "rev limiter" prevented anymore runs. LOL!
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VonYount
Journeyman Posts: 96
From: San Francisco, CA, USA
Registered: Jul 2000
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posted 07-22-2001 06:56 PM
Nope,I haven't had the driveline off--Could it be some kind of weird misfire?
-Ryan
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'66 Mustang Coupe
--351W
--black spot primer
--steel wheels
IP: Logged |
SteveLaRiviere
Administrator Posts: 24286
From: Saco, Maine Toys: '70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150
Registered: May 99
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posted 07-22-2001 07:14 PM
Take it for a drive and take note of the rpm and speed that the vibration is the worse. Then when you get to a clear spot, take it out of gear and see if the vibration is still there.If it's a vibration at, say, 2200, if it's in the engine it will vibrate at 2200 even if it's not in gear. If you get it rolling at the vibration speed and it does it without it being in gear and the engine idling, you'll know it's in the drivetrain. ------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
Ford. The closer you look, the better WE look!
IP: Logged |
mellowyellow
Gearhead Posts: 4608
From: So. Fl.
Registered: Aug 2000
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posted 07-22-2001 10:45 PM
Good information!!
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69maverick
Gearhead Posts: 742
From: Thomaston,CT.
Registered: Jan 2001
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posted 07-22-2001 11:09 PM
Do you have air shocks? If so have raised or lowered the car? I have seen alot of cars vibrate when raised up to much!
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VonYount
Journeyman Posts: 96
From: San Francisco, CA, USA
Registered: Jul 2000
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posted 07-23-2001 02:40 PM
Nope,No air shocks. It's weird--I'm gonna go out and check my U-Joints in a while, but I took her out on the freeway this morning, and I couldn't try Steve's suggestion (on account of my C4 in rush hour traffic). But I did notice that it only seems to appear from around 60-70mph, above or below that range, I can feather the throttle and it's smooth. Between 60-70mph, however, the vibration typically comes on around 2100-2500rpm, but it doesn't seem to be dependent on the revs so much as it is on the speed. I can accelerate fine through 2100-2500 rpm with no trouble, it's only when I'm crusing at that speed and rpm and decelerate...everything's hunky-dory until I get to a certain amount of "part-throttling", at this point the shudder comes on and I either give her more throttle or let off the pedal altogether, both serve to eliminate the shuddering. ???????????????
-Ryan ------------------
'66 Mustang Coupe
--351W
--black spot primer
--steel wheels
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69maverick
Gearhead Posts: 742
From: Thomaston,CT.
Registered: Jan 2001
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posted 07-23-2001 03:13 PM
The other thing that would be the easiest is an unbalenced wheel! or a broken belt in a tire!![This message has been edited by 69maverick (edited 07-23-2001).]
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Doc
Gearhead Posts: 466
From: Redwood City, Ca. USA
Registered: Jan 2001
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posted 07-23-2001 04:10 PM
A friend of ours chased one of these odd deals and it was the converter in his C4. It would do it in or out of gear at speed but not at the same RPM sitting.
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bluetech
Gearhead Posts: 238
From: Far and Away
Registered: Feb 2001
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posted 07-23-2001 08:16 PM
69maverick may be right! When shudder is experienced at a certain speed(not dependent on rpm) and disappears at a lower or higher speed, the problem is almost always unbalanced wheels. Have your wheels checked for balance and hope this clears the problem.
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