The slip Bump problem I'M FIXING IT!!!
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Joined: Apr 2015
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Called Ford and we talked about the slip yoke. you can in fact purchase it separately
On ford parts.com its listed under drive line and if you happen to have the 145 inch wheelbase truck like i do it would be $89.50USD
The part number is 4841
On ford parts.com its listed under drive line and if you happen to have the 145 inch wheelbase truck like i do it would be $89.50USD
The part number is 4841
I have something in the rear; if I don't come to a complete total stop then apply gas I can hear a 'clunk' most times.
The "Clunk" is also a bump, when you come to a stop and the rear suspension unloads (back end comes up), when the vehicle settles (back end drops back down to level) you feel a bump/clunk, almost like someone bumped into the back of the truck, what causes it is the rear slip-yolk on the drive shaft binds up and then when enough weight gets on it(when the truck settles/back end comes down) the yolk unbinds and "Clunk/Bump"
The distance between the rear axle yolk and the rear output shaft on the transmission or transfer case changes as the suspension travels, hence the need for the slip joint.
The distance between the rear axle yolk and the rear output shaft on the transmission or transfer case changes as the suspension travels, hence the need for the slip joint.
Thread Starter
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Joined: Apr 2015
Posts: 93
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Better OUT then IN
Joined: Feb 2011
Posts: 3,343
Likes: 255
From: South Florida (Ft. Lauderdale area)
The slip Bump problem I'M FIXING IT!!!
my experience with this is the slip yoke and the tsb to resolve.
My original 2011 - 2wd, had the tsb done to grease the slip yoke 3 times
my new FX4 has had the tsb done once when brand new and it now has 5,200 miles and the clunk is coming back.
IMHO, Ford should be ashamed that they do not have a permanent resolution yet. 2011 was the new model year and 2014 was the last run.
Both my trucks were stock and had the issue from day one. my 2011 had 75,000 miles when I traded and the issue was coming back but warranty was done.
I really thought after building the same truck for 4 years, they would have come up with a resolution to stop the bump, clunk.
shameful.
My original 2011 - 2wd, had the tsb done to grease the slip yoke 3 times
my new FX4 has had the tsb done once when brand new and it now has 5,200 miles and the clunk is coming back.
IMHO, Ford should be ashamed that they do not have a permanent resolution yet. 2011 was the new model year and 2014 was the last run.
Both my trucks were stock and had the issue from day one. my 2011 had 75,000 miles when I traded and the issue was coming back but warranty was done.
I really thought after building the same truck for 4 years, they would have come up with a resolution to stop the bump, clunk.
shameful.
I have owned 4 of these trucks, all to 100K miles and experienced the "clunk".
Mine have all been FX4 trucks, 2 with a short bed and 2 with a long bed. The clunk is more noticed in a long bed. In order to fix, I have marked the splines, dropped it, cleaned the inside out and brushed in new PTFE lubricant per Fords manuals. I have also added the following bump stops to the front hole on the bottom leaf. There is a predrilled hole these fit into perfect. This prevents alot of the axle roll or wrapping commonly found on these trucks. I have also been told over and over RoadMaster Active Suspension kits reduce this almost 100%, and are priced good here through the vendor. From what I understand and have been told, it happens when the lube is gone or pushed to the back of the joint in the gap, and off of the splines, makes sense. When this happens it exposes the factory nickle coating, and wears that down. It has been mentioned to me that when experiencing the clunk, you want to re lube ASAP to prevent damage to that coating.
Part No for bump stops
Energy Suspension Part ENE9-9116G (bought mine off eBay for 8.99 shipped)
Best of luck
Mine have all been FX4 trucks, 2 with a short bed and 2 with a long bed. The clunk is more noticed in a long bed. In order to fix, I have marked the splines, dropped it, cleaned the inside out and brushed in new PTFE lubricant per Fords manuals. I have also added the following bump stops to the front hole on the bottom leaf. There is a predrilled hole these fit into perfect. This prevents alot of the axle roll or wrapping commonly found on these trucks. I have also been told over and over RoadMaster Active Suspension kits reduce this almost 100%, and are priced good here through the vendor. From what I understand and have been told, it happens when the lube is gone or pushed to the back of the joint in the gap, and off of the splines, makes sense. When this happens it exposes the factory nickle coating, and wears that down. It has been mentioned to me that when experiencing the clunk, you want to re lube ASAP to prevent damage to that coating.
Part No for bump stops
Energy Suspension Part ENE9-9116G (bought mine off eBay for 8.99 shipped)
Best of luck
Thread Starter
Member
Joined: Apr 2015
Posts: 93
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Gaining traction.
CRYOGENIC solutions are available to harden the slip yoke shafts but after talking to a couple of high end racing machinists I have discovered that ford machines the slip yokes to a rough product and then nickle plates them to allow them to function properly. The replacement yokes have since gone back to being nickel plated due to issues with the " slip bump ford tells me", so by that logic I should be able to pick up a replacement from ford and that should be then end of my clunk. As good as that sounds I am not completely sold on the idea so on I went.
PS.. gm offers a nickle plated one to resolve the issue for its customers.
"Knew I should have went with the 07 Duramax".
just kidding.
Next I spoke to another machinist that makes slip yokes for racing applications located in the north east and he gave us some homework. They make yokes that are forged Chromoly that then go through a chemical process that leaves them much harder and smoother than nickel plating. He asked me for the size of the u-joint our slip yokes and the bore diameter. if they are within his specs he can machine replacements that wont bind.
PS.. gm offers a nickle plated one to resolve the issue for its customers.
"Knew I should have went with the 07 Duramax".
just kidding.Next I spoke to another machinist that makes slip yokes for racing applications located in the north east and he gave us some homework. They make yokes that are forged Chromoly that then go through a chemical process that leaves them much harder and smoother than nickel plating. He asked me for the size of the u-joint our slip yokes and the bore diameter. if they are within his specs he can machine replacements that wont bind.
Thread Starter
Member
Joined: Apr 2015
Posts: 93
Likes: 8
I have owned 4 of these trucks, all to 100K miles and experienced the "clunk".
Mine have all been FX4 trucks, 2 with a short bed and 2 with a long bed. The clunk is more noticed in a long bed. In order to fix, I have marked the splines, dropped it, cleaned the inside out and brushed in new PTFE lubricant per Fords manuals. I have also added the following bump stops to the front hole on the bottom leaf. There is a predrilled hole these fit into perfect. This prevents alot of the axle roll or wrapping commonly found on these trucks. I have also been told over and over RoadMaster Active Suspension kits reduce this almost 100%, and are priced good here through the vendor. From what I understand and have been told, it happens when the lube is gone or pushed to the back of the joint in the gap, and off of the splines, makes sense. When this happens it exposes the factory nickle coating, and wears that down. It has been mentioned to me that when experiencing the clunk, you want to re lube ASAP to prevent damage to that coating.
Part No for bump stops
Energy Suspension Part ENE9-9116G (bought mine off eBay for 8.99 shipped)
Best of luck
Mine have all been FX4 trucks, 2 with a short bed and 2 with a long bed. The clunk is more noticed in a long bed. In order to fix, I have marked the splines, dropped it, cleaned the inside out and brushed in new PTFE lubricant per Fords manuals. I have also added the following bump stops to the front hole on the bottom leaf. There is a predrilled hole these fit into perfect. This prevents alot of the axle roll or wrapping commonly found on these trucks. I have also been told over and over RoadMaster Active Suspension kits reduce this almost 100%, and are priced good here through the vendor. From what I understand and have been told, it happens when the lube is gone or pushed to the back of the joint in the gap, and off of the splines, makes sense. When this happens it exposes the factory nickle coating, and wears that down. It has been mentioned to me that when experiencing the clunk, you want to re lube ASAP to prevent damage to that coating.
Part No for bump stops
Energy Suspension Part ENE9-9116G (bought mine off eBay for 8.99 shipped)
Best of luck
Better OUT then IN
Joined: Feb 2011
Posts: 3,343
Likes: 255
From: South Florida (Ft. Lauderdale area)
The slip Bump problem I'M FIXING IT!!!
I had Roadmaster Active Suspension installed back in 2011 on my 2011 FX2.
it resolved an entirely different issue. the slip yoke has nothing to do with it.
RAS resolved the axle wrap. look at the website. From the web, (not mobile), click on the RAS advertising on the right, it'll highlight my truck as the first review.
also, I wrote a lengthy review in this forum back then as well. I'm currently on the mobile app so you can do a search on Road Master Active Suspension under my name as the thread starter.
https://www.f150forum.com/f82/axel-w...ension-141106/
read it and you'll learn a lot.
it resolved an entirely different issue. the slip yoke has nothing to do with it.
RAS resolved the axle wrap. look at the website. From the web, (not mobile), click on the RAS advertising on the right, it'll highlight my truck as the first review.
also, I wrote a lengthy review in this forum back then as well. I'm currently on the mobile app so you can do a search on Road Master Active Suspension under my name as the thread starter.
https://www.f150forum.com/f82/axel-w...ension-141106/
read it and you'll learn a lot.
Last edited by justjimmy; May 21, 2015 at 07:43 AM. Reason: Added link previous post