Shudder while driving
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Shudder while driving
I have a 93 f150, 117k miles, 5.0 aod trans. When I am driving, it seems that when the truck drops below 2k rpms, it shudders and vibrates really bad. Under acceleration it's fine, moving doing 55 , sitting at or around 2k, it's fine, but once it drops into overdrive, it shudders until I really give it some throttle.
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
Welcome to the forums.
Transmission ever been serviced? No? That is the first thing I would do. Drain trans/TC and fill with Mercon V. Drive it a day and see if it smooths out.
I've tried the fix it in the a bottle stuff, with little notice of improvement.
Worth a shot before diving deeper.
Transmission ever been serviced? No? That is the first thing I would do. Drain trans/TC and fill with Mercon V. Drive it a day and see if it smooths out.
I've tried the fix it in the a bottle stuff, with little notice of improvement.
Worth a shot before diving deeper.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Couple things here.
The 5.0 makes no useful power below about 2000rpm so if the truck has some rediculous rear axle ratio like 3.08 then just don't use OD.. it's not helping performance of fuel milage.
The AOD doesn't have a locking torque converter. 3rd and 4th lockup is accomplished mechanically inside the trans by bypassing the input drive shaft so trans fluid has no effect on this.
Could be the motor is running lean causing a lean stumble, leaks in the air injection system or at the exhaust manifolds will cause this. Also check fuel pressure.
The 5.0 makes no useful power below about 2000rpm so if the truck has some rediculous rear axle ratio like 3.08 then just don't use OD.. it's not helping performance of fuel milage.
The AOD doesn't have a locking torque converter. 3rd and 4th lockup is accomplished mechanically inside the trans by bypassing the input drive shaft so trans fluid has no effect on this.
Could be the motor is running lean causing a lean stumble, leaks in the air injection system or at the exhaust manifolds will cause this. Also check fuel pressure.
Cross-Country
Joined: Oct 2018
Posts: 99
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Second on the transmission. Change out the fluid and filter with Mercon V. If that doesn't work and all else fails, I bought a tiny tube of Shudder Fixxx from advanced when I couldn't get mine to stop shuddering and it hasn't shuddered since.
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Has as the OD and the D in the dash
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Cross-Country
Joined: May 2019
Posts: 63
Likes: 2
From: Santa Fe Texas
I’m having similar issues. My 92 straight 6 shutters under slight acceleration over 40 mph. Nothing crazy but enough to notice it. Also it will shutter when holding steady around 55-60mph, it all stops if I let completely off the gas for a second. Wondering if changing the fluid will help. Question is, I’m by no means a mechanic but I have no problem learning and taking it apart and putting some components on the truck back together but I’m trying to learn some of the terms....what is the “TC” mentioned in the reply?
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Tuned
Joined: Jun 2015
Posts: 354
Likes: 8
From: Winchester, KY,USA
I’m having similar issues. My 92 straight 6 shutters under slight acceleration over 40 mph. Nothing crazy but enough to notice it. Also it will shutter when holding steady around 55-60mph, it all stops if I let completely off the gas for a second. Wondering if changing the fluid will help. Question is, I’m by no means a mechanic but I have no problem learning and taking it apart and putting some components on the truck back together but I’m trying to learn some of the terms....what is the “TC” mentioned in the reply?
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