Hard thud while accelerating decelerating at speed

Reply Subscribe

Thread Tools

Search this Thread

Sep 12, 2016 | 12:15 AM

Yeshua

Thread Starter

New User

Joined: Sep 2016

Posts: 16

Likes: 0

Hard thud while accelerating decelerating at speed

I have a 90 ford bronco 5.0L and when ever I accelarate / decelerate at speeds above 30 mph I hear and feel a thud from the floor board I've changed out the rear u joint. The u joints look fine but I can't seem to get rid of this thud on when I speed up other slow down. The engine and transmission mounts look fine from what I can tell any other ideas?

Sep 12, 2016 | 10:44 AM

Kemicalburns

Hotshot

Joined: Jul 2002

Posts: 14,285

Likes: 12

From: Bend,OR

did you grease up the slip joint really good?

Sep 12, 2016 | 11:15 AM

Yeshua

Thread Starter

New User

Joined: Sep 2016

Posts: 16

Likes: 0

Slip joint grease

It looked pretty well greased I didn't add any to it though.

Sep 12, 2016 | 06:49 PM

gatorfor88

Postmaster

Joined: Jan 2013

Posts: 3,512

Likes: 3

From: Panama City

A pinion bearing going out will give these same symptoms.

Sep 12, 2016 | 08:28 PM

Yeshua

Thread Starter

New User

Joined: Sep 2016

Posts: 16

Likes: 0

Pinion bearing

I'll look in to that and let you know what I find out thanks.

Sep 13, 2016 | 09:25 AM

Kemicalburns

Hotshot

Joined: Jul 2002

Posts: 14,285

Likes: 12

From: Bend,OR

the issue with the 8.8 is you cant really snug the pinion down if it is loose. you will need a new crush sleeve and apply the proper torque if that is whats occuring.

Sep 14, 2016 | 11:38 PM

ZombieSlayer

Posting Guru

Joined: Nov 2002

Posts: 1,260

Likes: 0

From: Napa

I have similar issues but at lower speeds, the transmission guy I go to says my mount is bad and causing the tranny to move and thunk.

10 Ugly Ford Trucks That We Still Kinda Love

Joe Kucinski

10 Things Every Truck Owner NEEDS (2026 Edition)

Michael S. Palmer

Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath

Verdad Gallardo

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Joe Kucinski

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Brett Foote

Top 10 Ford Truck Tragedies

Joe Kucinski

AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

Brett Foote

Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Michael S. Palmer

Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Verdad Gallardo

10 Best Ford Truck Engines We Miss the Most!

Joe Kucinski

Sep 16, 2016 | 01:55 PM

jjmtuttle

New User

Joined: Oct 2010

Posts: 4

Likes: 0

Thud

There's a sensor on the rear end above the ring and pinion on the inside people think it's at abs but it's not just changed mine fixed one of many problems on my 96 I just got on trade...

Sep 20, 2016 | 11:05 PM

#10

Yeshua

Thread Starter

New User

Joined: Sep 2016

Posts: 16

Likes: 0

Checked the tranny mounts there good haven't changed the sensor yet I'm pretty sure if I change the sensor my rear anti lock light will go out.

Sep 21, 2016 | 10:13 AM

#11

Kemicalburns

Hotshot

Joined: Jul 2002

Posts: 14,285

Likes: 12

From: Bend,OR

your Radius arm bushings may need changed. have you peaked at those recently?

Sep 23, 2016 | 08:57 PM

#12

Yeshua

Thread Starter

New User

Joined: Sep 2016

Posts: 16

Likes: 0

More troubles

Thanks i'll take a look at those. But I have a new problem developing. I'm hearing a clicking from the front wheel well and it goes away when braking. I took the passenger side tire off to spin the hub to try and isolated the problem and found that when I spin the hub gets tight and hard to spin when I take the caliper off the hub spins freely no problem so what is causing the clicking? Is it the brakes or something else?

Sep 26, 2016 | 01:21 PM

#13

Kemicalburns

Hotshot

Joined: Jul 2002

Posts: 14,285

Likes: 12

From: Bend,OR

probably time for new caliper

Sep 26, 2016 | 11:43 PM

#14

Yeshua

Thread Starter

New User

Joined: Sep 2016

Posts: 16

Likes: 0

Quote:

Originally Posted by Kemicalburns

probably time for new caliper

Would the caliper cause clicking?

Sep 27, 2016 | 01:01 PM

#15

Kemicalburns

Hotshot

Joined: Jul 2002

Posts: 14,285

Likes: 12

From: Bend,OR

the clicking could be a number of things. Bearings, the brake pad tattle tails, could also be a tire weight mounted to the inside of the wheel that is hitting the caliper/brake pad pins. my wheels do this due to the weights being mounted there.