shudder!!! what next?
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shudder!!! what next?
I have a 00 f150 7700 series. When taking off ...I get a shutter ...replaced all rearend bearings...u joints ...rebuilt tranny. Could this be sometning warped in the driveshaft...or gears in the differential? Any ideas anyone. Actually the new u joints seemed to calm the shutter down a bit but its still there.
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Is this only when you are taking off or is it a constant wobble sort of thing? Are you sure that you didnt get your drive saft out of phase (flipped 1/2 revolution from proper place)? I would also have the driveshaft spun up to make sure it is balanced and not bent.
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From: pacific northwest
Our '96 Explorer 5.0 is doing the same thing. Generally happens when accelerating normally to enter freeway traffic from an on-ramp. The "shudder" is about one second at around 40 to 50 miles per hour. I have mixed thoughts about where it might me coming from...one thought is the transmission and the second is from the torsion bars. I mention the torsion bars because the shudder that happens gives me the feeling that at this point in acceleration the truck is trying to relieve some type of stored up tension...thus causing the shudder.
This is the best way I can describe it...any thoughts? Thanks, Casey
This is the best way I can describe it...any thoughts? Thanks, Casey
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I have ruled out U-joints. I poured in a bottle of Lucas, it seems to be some better?? I live in a small area the closest Dealer is 25 miles away, with just some local mech. They will not touch it. I am up a creek, I guess I will take it to dealer!!!$$$$$$$$
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From: pacific northwest
Yesterday I noticed that the shudder also occurs when I left our driveway and slowly accelerated with the shudder happening at 30 mph. The softer the acceleration the less noticeable is the shudder. I need to pay closer attention to see if it is related to the auto trans shifting. What is confusing is that the shudder is not consistant.
Also, the shudder happens the same whether both the winter tire and summer. I have our studded snow tires mounted on seperate rims and just had them swapped out two weeks ago. I wondering that if it was a tire issue wouldn't the shudder be more prolonged...such that if they were out of balance the shudder would show up at, say just for conversation, at 50 mph and continue to shudder at that speed consistantly? The shudder we have will happen at once for about one second at 40 or 50 mph getting onto the freeway then go away and does not come back when changing speeds for heavy traffic having to slow to 30 before getting back up to 60 mph. It is this lack of consistancy that makes me think it is not my tires...but I could be wrong.
Also, the shudder happens the same whether both the winter tire and summer. I have our studded snow tires mounted on seperate rims and just had them swapped out two weeks ago. I wondering that if it was a tire issue wouldn't the shudder be more prolonged...such that if they were out of balance the shudder would show up at, say just for conversation, at 50 mph and continue to shudder at that speed consistantly? The shudder we have will happen at once for about one second at 40 or 50 mph getting onto the freeway then go away and does not come back when changing speeds for heavy traffic having to slow to 30 before getting back up to 60 mph. It is this lack of consistancy that makes me think it is not my tires...but I could be wrong.
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Could it be the torque convertor? I don't think it would be tires or rims because that would be more of a constant shudder. I think it has something to do with the drivetrain...maybe the tranny or torque convertor. Does it do it at one particular RPM in the engine?
See if it happens at one RPM (if you have a tachometer).
See if it happens at one RPM (if you have a tachometer).
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Inspect the shafts, more specifically the boots and joints. If the boots are torn open and the grease as been flung out the joints will be slowly destroyed. I changed the cv shafts in my friends cavalier and instantly the ride was better. Is there a clicking noise when you take a tight corner, like pulling into a parking spot/parallel parking? How bad is the shudder? Feel like it is gonna shake the rearview mirror off the car or just a little shake?
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Pretty old thread here. Does the problem stillexist after all of this time? Nobody has mentioned whether or not any of these vehicles were equiped with a LS unit or not. Many times, a gear oil change, and some friction modifier fixes this "shudder" problem.
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From: pacific northwest
75F350...the shudder on my Explorer generally happens during acceleration. It lasts for about a second or two and feels like I have driven over a cattle guard...the series parallel steel pipes that span a gravel road between a fence line. The feeling of this shudder is strong but not enough to shake the fillings out of your teeth.
I have not checked the cv closely but the boots are not torn and they are not leaking. I am interesting in knowing more about the LS unit....what is an LS unit?
Thanks...Casey
I have not checked the cv closely but the boots are not torn and they are not leaking. I am interesting in knowing more about the LS unit....what is an LS unit?
Thanks...Casey
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The limited slip unit has a clutch pack designed to apply output to both rear tires for better traction. When the clutches need some conditioner (usually happens when the owner takes the truck to a quick lube place, and they install reg diff oil), then the vehicle "shudders just as you have mentioned. Muscle cars suffer from this , as well as 4x4 units. It is not limited to any particullar ride, just those with a "limited" slip unit installed. You can verify this by looking at the rear differential cover, and inspecting the tag that is mounted on one of the bolts holding the inspection cover on. It will state, " use LS fluid only", or post all of the numbers (should have two tags). and I will help you read them. If this is the case, a simple oil change in the diff, and some friction modifier will fix you right up.
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From: pacific northwest
75F350....thanks for sorting this out for me. I got home from work and crawled under the Explorer. There are two tags on the differential. One tag reads: (upper line) S621 A R
The lower line on this same tag reads: 3L73 88 6B26
The second tag reads: 75W140 Synth Oil Only
I would guess also that the differential is running a little low since there appears to be a slight leak. The bottom of the differential is wet with oil but I do not see any oil on the driveway...and the Explorer is always parked in the same place.
I am swapping out the tie rod outer ends this weekend and will also tend to the differential...let me know 75F350 what I need to do and I will get to it!
Thanks again, Casey
The lower line on this same tag reads: 3L73 88 6B26
The second tag reads: 75W140 Synth Oil Only
I would guess also that the differential is running a little low since there appears to be a slight leak. The bottom of the differential is wet with oil but I do not see any oil on the driveway...and the Explorer is always parked in the same place.
I am swapping out the tie rod outer ends this weekend and will also tend to the differential...let me know 75F350 what I need to do and I will get to it!
Thanks again, Casey