Hard thump/bump when getting off the throttle - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 08-29-2019, 06:40 AM Thread Starter
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Hard thump/bump when getting off the throttle

I am having a thump/bump when getting off the throttle and when getting back into it. It's worse when I get off the throttle suddenly and when almost goes away when I get out of it slowly. It's almost like someone is kicking the bottom of my seat. My truck is a 2002 F-250 4x4 with an automatic transmission.

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post #2 of 15 Old 08-29-2019, 06:47 AM
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A couple of things come to mind.

From personal experience, check the drive line to T-case coupler. Several years ago, I found a bolt on my driveway. Crawled under to see where it came from. It was from that coupler...and several other bolts were loose too. It was clunking back and forth.
2nd, do you have a two piece drive shaft? If so, check the slip yoke. They need to be greased from time to time.


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post #3 of 15 Old 08-29-2019, 12:44 PM
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Rear driveshaft center support carrier bearing. The rubber there will disintegrate. Happened to me causing my bump on initial acceleration and deceleration.
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post #4 of 15 Old 09-03-2019, 03:56 PM Thread Starter
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Quote:
Originally Posted by SuperCrutyPS View Post
A couple of things come to mind.

From personal experience, check the drive line to T-case coupler. Several years ago, I found a bolt on my driveway. Crawled under to see where it came from. It was from that coupler...and several other bolts were loose too. It was clunking back and forth.
2nd, do you have a two piece drive shaft? If so, check the slip yoke. They need to be greased from time to time.
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Originally Posted by ThaChad View Post
Rear driveshaft center support carrier bearing. The rubber there will disintegrate. Happened to me causing my bump on initial acceleration and deceleration.
Thank you, I will check all of these out
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post #5 of 15 Old 09-05-2019, 08:16 AM Thread Starter
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Taking the truck in to get a Teflon service on the driveshaft. Also going to get the rear diff serviced and checked out because I hear a howl at certain speeds. I will update with the results.
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post #6 of 15 Old 09-06-2019, 06:05 PM
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REAR DRIVE SHAFT, CARRIER BEARING OR U-JOINTS.STAY AWAY FROM MOOG PARTS THEY WERE BOUGHT OUT NOW THERE PARTS R JUNK I ALREADY FOUND ONE OF THE CUPS ON A NEW U-JOINT WAS MISSING A NEEDLE BEARING REALLY !!!!!!!!!!!!!!!!
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post #7 of 15 Old 09-06-2019, 06:55 PM
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Buddylee, be sure to post your findings after your test drive. I did hear the same about Moog parts. I've still had good luck with them but I've heard their quality control tanked. Did they sell out to some Chinese company? I dont mean to change subjects. But itll be good info before I rebuild another driveline. Usually I try to go with Spicer.
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post #8 of 15 Old 10-01-2019, 02:33 PM Thread Starter
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I just got the truck back from the shop yesterday. Turns out it needed carrier bearings, ring and pinion, and hub bearings. I had the Teflon grease treatment, new u-joints, and a balance done on the drive shaft while they were at it. So ya basically almost all new from the transmission back now lol. The noise is gone and it's much smoother now. I will have a better impression after I get through the breakin period.
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post #9 of 15 Old 10-14-2019, 03:35 PM Thread Starter
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Update: Getting this work done fixed the loud howl at highway speeds but it did not fix my slack in the drivetrain. I will be taking it to a transmission shop on Wednesday to have them look at it. It must be in the transmission or the transfer case. It almost seems to be an issue with the torque converter.
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post #10 of 15 Old 10-14-2019, 04:13 PM

 
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Did the driveline shop not check the clutches in the diff?

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