three quick questions (i hope)
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Laughing Gas
Joined: Jan 2004
Posts: 807
Likes: 0
From: Prince George, BC
three quick questions (i hope)
going to try and shim my carrier bearing to stop my truck from the common shake at 40 mph
#1- before i start, does anyone know the bolt size of the factory bolts so i can get longer ones
#2- once i put one shim in and before i tighten everything up, do i have to allign the driveshaft side to side or does it find its own allignment by the bolts
#3-is there a link or anything on how to do this job, i think it is straight forward from what i have read on here, and any of you have any tips for me before i start
thanks
ok i know i said three but i just thought of one more
#4- couldnt find it on here but does anyone know what the average amounts of 1/4" shims everyone needed to use or should i just go 1/4 at a time?
#1- before i start, does anyone know the bolt size of the factory bolts so i can get longer ones
#2- once i put one shim in and before i tighten everything up, do i have to allign the driveshaft side to side or does it find its own allignment by the bolts
#3-is there a link or anything on how to do this job, i think it is straight forward from what i have read on here, and any of you have any tips for me before i start
thanks
ok i know i said three but i just thought of one more
#4- couldnt find it on here but does anyone know what the average amounts of 1/4" shims everyone needed to use or should i just go 1/4 at a time?
Thread Starter
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Laughing Gas
Joined: Jan 2004
Posts: 807
Likes: 0
From: Prince George, BC
i dont have a lift my truck is stock, maybe i am saying the wrong thing, i want to shim the bearing that supports the rear driveshaft, i got a bad shake at 40-45 mph, and if i go any faster or slower it stops, and after being on here i have concluded this is my problem
Thread Starter
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Laughing Gas
Joined: Jan 2004
Posts: 807
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From: Prince George, BC
Originally Posted by Orezona
Is your "shake" happening upon acceleration, cruising or when you let off the pedal?
i read on here about guys shimming the rear driveshaft carrier bearing down to make the rear driveshaft straight for the shake reason, maybe i misread them and they only did it when they had a lift. i had all my u-jints checked and they were fine, one got replaced.
Postmaster
Joined: Oct 2004
Posts: 3,767
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From what I know, the shimming of the carrier bearing (in stock height applications) is to get rid of the vibration that happens under heavy throttle from a stop or slow roll.
I haven't had u-joint problems in years (knock on wood), but that vibration always happened when letting off the pedal causing "slack" for a bad joint or just upon applying throttle but that wasn't vibration it was a clunk.
I'm going to guess here. It's possible what you are feeling is a "chug". Grease your drive-line at the slip joint and see what that does. In my experience you don't have to drop the drive-line, cut the bands off the boot and use a needle tip on your grease gun working your way around the drive-shaft. My best experience has been with the Lucas "tacky" grease.
Hope this helps.
I haven't had u-joint problems in years (knock on wood), but that vibration always happened when letting off the pedal causing "slack" for a bad joint or just upon applying throttle but that wasn't vibration it was a clunk.
I'm going to guess here. It's possible what you are feeling is a "chug". Grease your drive-line at the slip joint and see what that does. In my experience you don't have to drop the drive-line, cut the bands off the boot and use a needle tip on your grease gun working your way around the drive-shaft. My best experience has been with the Lucas "tacky" grease.
Hope this helps.
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Thread Starter
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Laughing Gas
Joined: Jan 2004
Posts: 807
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From: Prince George, BC
Originally Posted by Orezona
From what I know, the shimming of the carrier bearing (in stock height applications) is to get rid of the vibration that happens under heavy throttle from a stop or slow roll.
I haven't had u-joint problems in years (knock on wood), but that vibration always happened when letting off the pedal causing "slack" for a bad joint or just upon applying throttle but that wasn't vibration it was a clunk.
I'm going to guess here. It's possible what you are feeling is a "chug". Grease your drive-line at the slip joint and see what that does. In my experience you don't have to drop the drive-line, cut the bands off the boot and use a needle tip on your grease gun working your way around the drive-shaft. My best experience has been with the Lucas "tacky" grease.
Hope this helps.
I haven't had u-joint problems in years (knock on wood), but that vibration always happened when letting off the pedal causing "slack" for a bad joint or just upon applying throttle but that wasn't vibration it was a clunk.
I'm going to guess here. It's possible what you are feeling is a "chug". Grease your drive-line at the slip joint and see what that does. In my experience you don't have to drop the drive-line, cut the bands off the boot and use a needle tip on your grease gun working your way around the drive-shaft. My best experience has been with the Lucas "tacky" grease.
Hope this helps.
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Postmaster
Joined: Oct 2004
Posts: 3,767
Likes: 1
Grease it a a lot. Put the needle tip into each groove and pump it full. It's not like you can hurt anything. Try it and let us know. I'm not saying it's the cure but I don't think shimming the carrier is either. WE can figure it out together.
Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
Jason is right. The shimming is used to correct driveline shudder on takeoff, usually a slow takeoff. Mine does it if I pull out slowly. Have you had your tires balanced lately? I had some cheap ones on my truck and they were so out of round that it made the truck shake like that. The guy spun it by hand on the balancer and you could see it was about a 1/4" out. Put a set of Jetzon Reventer A/T's on the rear and the shake is almost gone now. I think the fronts will get rid of the rest.
Thread Starter
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Laughing Gas
Joined: Jan 2004
Posts: 807
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From: Prince George, BC
Originally Posted by twags6
Jason is right. The shimming is used to correct driveline shudder on takeoff, usually a slow takeoff. Mine does it if I pull out slowly. Have you had your tires balanced lately? I had some cheap ones on my truck and they were so out of round that it made the truck shake like that. The guy spun it by hand on the balancer and you could see it was about a 1/4" out. Put a set of Jetzon Reventer A/T's on the rear and the shake is almost gone now. I think the fronts will get rid of the rest.
anyways i will report tommorow, hey you think some wheel bearing grease would be good to use i got a quart container of it in my shop?
Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
Sounds like a plan. The slip joint on mine was so dry that the drive shaft didnt drop when I took the bolts out of the center bearing. I could actually hang on it! 
The wheel bearing grease might work better cause its more paste like and would probably stick better.
The wheel bearing grease might work better cause its more paste like and would probably stick better.
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Laughing Gas
Joined: Jan 2004
Posts: 807
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From: Prince George, BC
well heres the report
i loaded the male end of the splines up with about 1/8" of grease all around, then i loaded the female end with tons of grease, there was gobs of it as far as i could reach up in there, and put it back together, had a hard time until i heard the air that was built up in there come out. took it for a ride and at first i thought it seems to be repaird, but sorry to say the shake is still there, allthough i must say i think it is alittle more mild now than before. i am going to have the wheels rebalanced agian sometime maybe this week and give that a shot, might as well start with the cheap things first.
i loaded the male end of the splines up with about 1/8" of grease all around, then i loaded the female end with tons of grease, there was gobs of it as far as i could reach up in there, and put it back together, had a hard time until i heard the air that was built up in there come out. took it for a ride and at first i thought it seems to be repaird, but sorry to say the shake is still there, allthough i must say i think it is alittle more mild now than before. i am going to have the wheels rebalanced agian sometime maybe this week and give that a shot, might as well start with the cheap things first.
Senior User
Joined: Nov 2007
Posts: 173
Likes: 1
From: Huntington, WV
I've had the very same problem with different trucks. If I had my foot on the accelerator, it shook pretty bad and as soon as I'd accelerate or decelerate, the shake would go away. If your suspension is stock and you have some miles on the u-joints, that's the very first thing I'd check. They're pretty cheap, but a PITA to change without a press or vice. Good luck
Of the next Riffraff East
Joined: Oct 2004
Posts: 8,679
Likes: 2
From: Concord NC
Seems to be somewhat common on our trucks. Several post in the past have addressed this and as far as I know, no one has figured it out. It is also a problem in the 150s and a search did produce one thread that stated that he fixed his shaking by making Ford replace his axles. Mine shakes at 42-46mph and it is more noticable when I have new tires.