Clunking into reverse

Reply Subscribe

Thread Tools

Search this Thread

Jul 30, 2002 | 03:26 PM

PATRICKA

Thread Starter

New User

Joined: Feb 2002

Posts: 16

Likes: 0

Clunking into reverse

Hi Folks,
Some time since I have been here on the sight. Must be because my
78 Ford F250 400/C6 has been purring just great. But now a problem has arose seems like it was very slight in the beginning when I first heard it. From drive to reverse or from Park to reverse or even nuetral to reverse There is a clunk. I have replaced all of my u-joints. All of the yokes on the shafts look great and feel tight. Cannot seem to budge them with a big set of channel locks in either direction. Yet when the motor is running and I shift in any of the above order I hear the clunk which vibrates through the whole cab.It only happens going to reverse with or without the brake peddle pressed. And now it seems to be getting louder and a harder clunk. Shifting to drive is sweet and smooth from any shifter position.

I would sure appreciate you ford enthusiasts drive train experience with my problem.

Patricka

Jul 30, 2002 | 03:36 PM

jokerx55

Junior User

Joined: Jul 2002

Posts: 81

Likes: 0

From: Abington US

Clunking into reverse

I experience this same problem and have done everything that you have done. My advise is to check your motor mounts. My right side one is junk and i believe that is why this happens to me. I just haven't gotten around to fixin it.

Jul 30, 2002 | 03:54 PM

Vampiro

Cargo Master

Joined: Sep 2001

Posts: 3,135

Likes: 0

From: Canada

Clunking into reverse

i replaced the mounts for the engine but not the u joints or tranny mounts. try the tranny. i have the same problem

Jul 30, 2002 | 07:30 PM

Mil1ion

New User

Joined: Jan 2008

Posts: 0

Likes: 24

Clunking into reverse

I can't believe you guys haven't seen my fix for this.

Take the driveshaft out and in side the front receiver spline put some high temp wheel bearing grease in there.
A handful should do.
Now put the driveshaft back on...

No more clunk.

http://www.clubfte.com/users/mil1ion/2cents.gif

[font color=red]Dennis

FTE Assistant Administrator
[/font]

[link: motorhaven.autoanything.com|How YOU Can Support This Site]

http://www.clubfte.com/users/mil1ion/canada_flag_animated.gif

[link:www.clubfte.com/users/mil1ion/Mil1ion.html|My Website,"North Of The 49th"]

[link:www.ford-trucks.com/guidelines.html|Club FTE]
http://www.clubfte.com/users/mil1ion/Minimorleytruck.JPG
[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
64 1/2 Mustang Pre-World's Fair Car #8092
68-Mustang 289 2v-Sunlit Gold
[/font]

Jul 31, 2002 | 10:09 AM

PATRICKA

Thread Starter

New User

Joined: Feb 2002

Posts: 16

Likes: 0

Clunking into reverse

Hi GUys,
I forgot to add that I have a 4x4 with a NP205 transfere case. :-)

Jul 31, 2002 | 12:23 PM

dfisher1

Posting Guru

Joined: Jul 2001

Posts: 1,613

Likes: 2

From: Gainesville, FL

Clunking into reverse

All,
Dennis could be right but, if it does it without the brake applied, it is more likely the backlash in the differential.
1. Jack the rear end off the ground.
2. Put the trans in neutral.
3. Grab the driveshaft and rotate it clocwise/counterclockwise.
If there is more than 1/4 " play you need to adjust the rear end. I like to set mine at 1/8" play.
While your at it, push and pull on the driveshaft and see if the pinion flange is moving in and out of the rearend. If it is, you can adjust that also, after you've pulled the diff.
KingFisher