U Joints?
Thread Starter
|
Freshman User
Joined: Jan 2011
Posts: 30
Likes: 0
U Joints?
Vehicle: 2000 Ford F150 Supercab 4X4 4.6L V8 77K
Problem: When I start backing up in my truck I hear a "pop" or "loud bang" come from somewhere in the mid to rear of the truck, does anyone know what this could be or maybe is it a universal joint somewhere? Any help would be appreciated.
Problem: When I start backing up in my truck I hear a "pop" or "loud bang" come from somewhere in the mid to rear of the truck, does anyone know what this could be or maybe is it a universal joint somewhere? Any help would be appreciated.
Posting Guru
Joined: May 2006
Posts: 2,486
Likes: 0
From: Iowa
possible that its u joints, or you could have something damaged in the rear end. I have been through a couple 8.8 rear ends.
Also could be the slip yoke. They can dry up and cause a poping noise. Applying proper grease to the splines takes care of it usually.
Id check u joints first. There are two of them on the drive shaft.
Block your wheels.
Climb under your truck and see if you can see any movement in the u joints when you push on the driveshaft on the ends. There should be no play at all. Absolutly zero movement. and dont be afraid to push on it hard, it can take some force to get them to move sometimes, if they are bound up. I usually put it in neutral to check them.
Also could be the slip yoke. They can dry up and cause a poping noise. Applying proper grease to the splines takes care of it usually.
Id check u joints first. There are two of them on the drive shaft.
Block your wheels.
Climb under your truck and see if you can see any movement in the u joints when you push on the driveshaft on the ends. There should be no play at all. Absolutly zero movement. and dont be afraid to push on it hard, it can take some force to get them to move sometimes, if they are bound up. I usually put it in neutral to check them.
Elder User
Joined: Mar 2010
Posts: 601
Likes: 0
OK, since it's not the brakes, ditto on the above. Usually, when the u-joints are bad enough to cause that much of a knock when you put it in gear and go one way or the other, there is quite a bit of metal missing internally. You should see the equivalent of metal filings around the u-joint's cups. The filings used to be your needle bearings.
Dave
Dave
Trending Topics
Thread Starter
|
Freshman User
Joined: Jan 2011
Posts: 30
Likes: 0
I just pulled out the rear driveshaft to do the u joint job and ATF came out of the high end (where it goes into tranny), is this normal?
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Thread Starter
|
Freshman User
Joined: Jan 2011
Posts: 30
Likes: 0
Put New U-Joint in closest to the rear axle and didn't hear or feel anything when backing up, we'll see how it is after driving it for a few days. The u-joint closest to the transmission seemed good.
Very happy man now.
Thread
Thread Starter
Forum
Replies
Last Post
xltblt
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
11
Oct 26, 2011 07:23 PM
bronkntrukholik
1973 - 1979 F-100 & Larger F-Series Trucks
8
Jul 3, 2010 09:25 PM
FordPickup460
Clutch, Transmission, Differential, Axle & Transfer Case
1
Dec 13, 2004 06:02 AM
