Radius Arm Bushing Bump
Thread Starter
|
New User
Joined: Aug 2004
Posts: 11
Likes: 0
Radius Arm Bushing Bump
I Have Been Experiencing A Problem That Reoccures. I Have Replaced My Radius Arm Bushings 3 Or 4 Times In The Past Two Years And The Bump Allways Comes Back Allmost Immediatly. I Have Been Told To Replace Radius Arm, Replace Radius Arm Bracket. I'm Not Sure What To Do, Anyone Have A Similar Experience?
Senior User
Joined: Mar 2004
Posts: 209
Likes: 0
From: New York
When the bushings were replaced did you see how the condition is on the radius arm bracket? Is the nut side of the bracket rusted out and if the shape of the hole round anymore? How is the condition of the bushing, is the hole in the bushing oval?
These are some of the things I've seen working on Bronco's.
1- Bracket needs replacing if hole is no longer round and all rusted up. This condition will just chew up the bushings.
2- Is there a heat shield covering the bushing on the nut side? If not the heat from the catalytic convertor will soften the bushing (especially polys) causing the hole to oval. This will cause the arm to move up and down. If you don't have this shield you can get one from Ford (small metal cup that slips over the bushing on the nut side).
3- And the torque specs for the radius arm nut is 120ft.lbs.
Warr
These are some of the things I've seen working on Bronco's.
1- Bracket needs replacing if hole is no longer round and all rusted up. This condition will just chew up the bushings.
2- Is there a heat shield covering the bushing on the nut side? If not the heat from the catalytic convertor will soften the bushing (especially polys) causing the hole to oval. This will cause the arm to move up and down. If you don't have this shield you can get one from Ford (small metal cup that slips over the bushing on the nut side).
3- And the torque specs for the radius arm nut is 120ft.lbs.
Warr
Junior User
Joined: Nov 2003
Posts: 95
Likes: 0
This is a stupid question, but what are you considering radius arm bump? Do you actually feel the radius arms bumping against the brackets?
I have some kind of a wierd problem going on right now that may be what you're talking about. I have a '79 Bronco and after I've stopped at a light or something I feel a "thump" like slack is coming out of the truck somewhere when I start to accellerate. I know that many of my bushings are pretty bad and was wondring if that might be the source. It doesn't seem like a drive shaft or tranny thing. If I'm totally on the wrong track let me know and I'll bail out of this thread. Thanks for any help.
I have some kind of a wierd problem going on right now that may be what you're talking about. I have a '79 Bronco and after I've stopped at a light or something I feel a "thump" like slack is coming out of the truck somewhere when I start to accellerate. I know that many of my bushings are pretty bad and was wondring if that might be the source. It doesn't seem like a drive shaft or tranny thing. If I'm totally on the wrong track let me know and I'll bail out of this thread. Thanks for any help.
Senior User
Joined: Mar 2002
Posts: 137
Likes: 1
From: Ponca City, OK
You might want to check the slip joint on your rear driveshaft. I had a thump just as you described everytime I took off after a complete stop. Turns out the slip joint becomes dry and "pops" when it moves. Try removing the rubber cover and lubing the joint.
Thread Starter
|
New User
Joined: Aug 2004
Posts: 11
Likes: 0
The Bump
Originally Posted by ERIC79XLT
This is a stupid question, but what are you considering radius arm bump? Do you actually feel the radius arms bumping against the brackets?
I have some kind of a wierd problem going on right now that may be what you're talking about. I have a '79 Bronco and after I've stopped at a light or something I feel a "thump" like slack is coming out of the truck somewhere when I start to accellerate. I know that many of my bushings are pretty bad and was wondring if that might be the source. It doesn't seem like a drive shaft or tranny thing. If I'm totally on the wrong track let me know and I'll bail out of this thread. Thanks for any help.
I have some kind of a wierd problem going on right now that may be what you're talking about. I have a '79 Bronco and after I've stopped at a light or something I feel a "thump" like slack is coming out of the truck somewhere when I start to accellerate. I know that many of my bushings are pretty bad and was wondring if that might be the source. It doesn't seem like a drive shaft or tranny thing. If I'm totally on the wrong track let me know and I'll bail out of this thread. Thanks for any help.
YOUR PROBLEM I THINK IS A DRY SLIP JOINT WHAT I A REFERRRING TO IS A BUMP DISTICTIVE IN THE FRONT FLOOR BOARD OF WHICH EVER SIDE THE BUHING IS BAD ON. IT WILL ACTUALLY BUMP LIKE A SHARP STRIKE ON THE FLOOR BOARD.
Thread Starter
|
New User
Joined: Aug 2004
Posts: 11
Likes: 0
The Bump
Originally Posted by ERIC79XLT
This is a stupid question, but what are you considering radius arm bump? Do you actually feel the radius arms bumping against the brackets?
I have some kind of a wierd problem going on right now that may be what you're talking about. I have a '79 Bronco and after I've stopped at a light or something I feel a "thump" like slack is coming out of the truck somewhere when I start to accellerate. I know that many of my bushings are pretty bad and was wondring if that might be the source. It doesn't seem like a drive shaft or tranny thing. If I'm totally on the wrong track let me know and I'll bail out of this thread. Thanks for any help.
I have some kind of a wierd problem going on right now that may be what you're talking about. I have a '79 Bronco and after I've stopped at a light or something I feel a "thump" like slack is coming out of the truck somewhere when I start to accellerate. I know that many of my bushings are pretty bad and was wondring if that might be the source. It doesn't seem like a drive shaft or tranny thing. If I'm totally on the wrong track let me know and I'll bail out of this thread. Thanks for any help.
Trending Topics
Thread Starter
|
New User
Joined: Aug 2004
Posts: 11
Likes: 0
Bushings
Originally Posted by bronco5.8
When the bushings were replaced did you see how the condition is on the radius arm bracket? Is the nut side of the bracket rusted out and if the shape of the hole round anymore? How is the condition of the bushing, is the hole in the bushing oval?
These are some of the things I've seen working on Bronco's.
1- Bracket needs replacing if hole is no longer round and all rusted up. This condition will just chew up the bushings.
2- Is there a heat shield covering the bushing on the nut side? If not the heat from the catalytic convertor will soften the bushing (especially polys) causing the hole to oval. This will cause the arm to move up and down. If you don't have this shield you can get one from Ford (small metal cup that slips over the bushing on the nut side).
3- And the torque specs for the radius arm nut is 120ft.lbs.
Warr
These are some of the things I've seen working on Bronco's.
1- Bracket needs replacing if hole is no longer round and all rusted up. This condition will just chew up the bushings.
2- Is there a heat shield covering the bushing on the nut side? If not the heat from the catalytic convertor will soften the bushing (especially polys) causing the hole to oval. This will cause the arm to move up and down. If you don't have this shield you can get one from Ford (small metal cup that slips over the bushing on the nut side).
3- And the torque specs for the radius arm nut is 120ft.lbs.
Warr
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Senior User
Joined: Mar 2004
Posts: 209
Likes: 0
From: New York
You may have to put an additional shield on just to deflect the heat. Had one truck with an occurring problem, put an aluminum plate on the frame between the cat and radius arm bushing. That solved the bushing oval problem. The aluminum is 1/8th inch thick with a 90 degree 1 inch lip so it can be riveted onto the frame.
Warr
Warr
Junior User
Joined: Nov 2003
Posts: 95
Likes: 0
Sorry to keep intruding on your post, but I just wanted to say thanks to Richartdana44 and Boyd Fly429 for their advice on the dry slip joint. I greased that thing up over the weekend and the "thump" I was talking about seems to be almost completely gone. It took a good 20-30 shots of grease before any started coming out the little vent hole in the end of the slip yoke. The thing was dry as a bone! The Ford-Trucks Forums saves me again! Thanks guys.
Senior User
Joined: Aug 2003
Posts: 144
Likes: 0
From: georgia
had same prob. did the drive shaft fix still had same prob. went into goodyear for oil change and tire rotation while my bronco was up on rack walked under and saw that my radius ard ushings weere not only finished but had torn out of their mount on drivers side. replaced and no more thunk.