Thunk sound from rear under load.

accidentprone86

New Member

Apr 1, 2005

189

0

0

Westminster Colorado

Oct 24, 2005

#1

• Oct 24, 2005

• #1

So I have a kinda weird problem. Every time I go past 10% throttle I hear a loud thunk come from the rear of the car. At first I thought it was the pinion gear on the ring gear but then I tested it out a little more. Like I said it is only at about 10% throttle, I can be accelerating "so the pinion and ring are in contact and under load" but then when I give a little more gas it will make the sound. It doest not do it when decelerating.
What else could this be?? I know it isn’t the ring and pinion.



Thanks:SNSign:

 

1991vert

10 Year Member

Feb 27, 2004

1,103

7

69

Ludlow, MA

Oct 24, 2005

#2

• Oct 24, 2005

• #2

is it taking off quickly? the pinion snubber could be shot and your axle pumpkin is hitting your car. happened to me all the time until i did my springs and got a new snubber

 

Thenemesis

Member

Nov 16, 2004

321

0

17

chuckletown, sc

Oct 24, 2005

#3

• Oct 24, 2005

• #3

sounds like your trans isnt mounted down good.. my 86 did it for a long while.. when i put my X pipe on it, low and behold the bolts werent tight and the mount was ate up and worthless.. just one thing that could be wrong

 

M

mustang-a-holic

New Member

Jul 8, 2005

51

0

0

Oct 24, 2005

#4

• Oct 24, 2005

• #4

Torque boxes.
U-joints

 

accidentprone86

New Member

Apr 1, 2005

189

0

0

Westminster Colorado

Oct 24, 2005

#5

• Oct 24, 2005

• #5

It sounds almost like a snapping if I take off going up a hill. Also if I let off of the gas in first and second and let it cruse at idle it we jerk back and forth each time making the thunking sound.

 

I

iapexl8r

Member

Apr 1, 2005

254

0

17

Oct 24, 2005

#6

• Oct 24, 2005

• #6

sounds alot like upper control arm mounts are shot, usually the sheetmetal tears then when you slightly accelerate or sometimes decelerate it pops or pings just another thing for you to check out. Chris

 

sgarlic

Founding Member

Apr 21, 2001

3,085

1

56

Oct 25, 2005

#7

• Oct 25, 2005

• #7

Driveshaft clunk I bet.

 

D

dannydoo

Member

Sep 10, 2004

195

0

17

Oct 25, 2005

#8

• Oct 25, 2005

• #8

tranny mount,u joint,or any of above,all are possible.


.jack up the rear..both sides by the lowr cntr arms
make sure its supported really good..and carefully jerk the tire back and forth by hand...if u cant see what is loose....then get more drastic.
maybe have some one looking under it,while your backing up on a set of ramps,or going down them..
just ideas....u gotta get under there and see whats up.
we can only give you ideas..the rest is up to you.
whatever it is....im betting its a simple fix!!!so get to it!

 

Aliate X

Member

May 9, 2005

602

1

18

Rockland NY

Dec 14, 2005

#9

• Dec 14, 2005

• #9

I am getting this same exact sound, sorry to dig a thread up.

But its coming from the left rear of the car. The upper and lowers are only about 5 months old with new bushings and stuff. I recently did a TKO swap using the stock driveshaft.