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  #1  
Old 03-09-2013, 11:26 PM
bnvl76 bnvl76 is offline
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Smile Thump noise when slowing down

Vehicle info:

1995 Ford Ranger XLT 2X4
Extended Cab
3.0 V-6 (Vulcan)
4R44E 4 Speed Automatic Transmission
Non-limited slip differential 3:73 Gear Ratio 7.5" hypoid gears
83000 original miles

Vehicle problem:

When driving truck and slowing down at 15MPH makes a thump noise from the underbody.

When truck is cold does not make the noise.

Noise is more pre dominate when slowing down and stopping driving up hill than down hill.

Transmission has been rebuilt and serviced, differential has just been serviced, engine just tuned up, cooling system serviced, and throttle body cleaned.

Please advise - Thank you!!
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  #2  
Old 03-12-2013, 11:12 AM
NHRA NHRA is offline
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Can you feel it in your feet. Does it happen when you use the brakes. Check to see if it happens when it down shifts out of 3rd into 2nd or 2nd into 1st.
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  #3  
Old 03-12-2013, 11:56 AM
patrickposton92 patrickposton92 is offline
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I am interested in this also, my 1990 does this. It sounds to me like it is from the passenger side floor board by the firewall. My running theory is that a flap for the heater box is faulty. It only seems to make the noise when i have my heater off and on the cool setting.
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  #4  
Old 03-12-2013, 12:09 PM
NHRA NHRA is offline
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I don't think so, it would have to hit hard. When I'm in 4wheel my truck makes a thud in frontend when I slow down and when I step down on it.
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  #5  
Old 03-12-2013, 01:28 PM
Joe16 Joe16 is offline
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Mine dose it to it all most sounds like a compresse kicking on and off
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  #6  
Old 03-13-2013, 08:44 AM
Joe16 Joe16 is offline
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This may help you guys out
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File Type: jpg image-3352598886.jpg (58.9 KB, 60 views)
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  #7  
Old 03-13-2013, 09:51 AM
foutd77 foutd77 is offline
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I may be stating the stupid but I had an issue similar to this (but I could centralize the sound to the front of the truck) and the caliper frame bolts were loosening and backing out so when I hit the brake it would "clunk" due to the movement
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2001 Ford Ranger (Obviously), 3.0 Edge, 2wd, Single Cab, Manual Trans, Explorer Axle Swap 4.10 gears, Rear Disc Brakes, Air Lift Helper Air Bags, 31" BFG's, Corbeau Seats, Custom Console, Console Vault,Yakima Rack, Dual Hella's mounted behind the grille, aux. reverse lights, Trailer Brake Controler and lots of TLC 250,000 miles and still ticking. Contemplating 4bt Swap when the tired 3.0 finally gives up.
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  #8  
Old 03-13-2013, 08:17 PM
bnvl76 bnvl76 is offline
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Smile Re: Thump noise when slowing down

I dont feel it in the brakes.

I hear the thump coming from rear end / rear drive shaft area.

I had to change the rear axle differential oil. So I used synthetic gear oil and after driving it about 10 miles noticed it had much quiter thump almost smooth to the point there was no thump.

I will also lube the drive shaft slip yoke tomorrow that shoud re-solve issue unless its a worn out U Joint.

It may be in the fact the truck is 17 years old and still has the original U joints and never had slip yoke greased.

Thanks!
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  #9  
Old 03-14-2013, 06:32 PM
bnvl76 bnvl76 is offline
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Default Re: Thump noise when slowing down

Recently installed new front brakes, repacked wheel bearings calipers in good shape.
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  #10  
Old 03-17-2013, 11:45 PM
sparky00 sparky00 is offline
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Don't know if this is close but I had a similar issue with a different vehicle. It turned out to be a body mount came loose.

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  #11  
Old 03-20-2013, 12:28 PM
bnvl76 bnvl76 is offline
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Default Re: Thump noise when slowing down

I read the technical bulletin ordered and received the Ford XG-8 grease required to lube the slip shaft spline on the rear drive shaft that the TB calls for.

Just a note - I paid 8 bucks at my ford dealer for the a 3 ounce tube of Motorcraft (XG-8) PTFE Lubricant. Amazon offers it for about 4 bucks.

I tried to buy a repair kit for my Ranger (1995) that the TB calls out but only available for a 1998-2005. Ford dealer and several on line OEM parts houses not sure it will fit a earler or later truck model.

Again ford charges about 50 bucks for the kit and Amazon about 25 bucks.
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  #12  
Old 03-22-2013, 10:39 AM
zman7125 zman7125 is offline
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Default Re: Thump noise when slowing down

Quote:
Originally Posted by bnvl76 View Post
I read the technical bulletin ordered and received the Ford XG-8 grease required to lube the slip shaft spline on the rear drive shaft that the TB calls for.

Just a note - I paid 8 bucks at my ford dealer for the a 3 ounce tube of Motorcraft (XG-8) PTFE Lubricant. Amazon offers it for about 4 bucks.

I tried to buy a repair kit for my Ranger (1995) that the TB calls out but only available for a 1998-2005. Ford dealer and several on line OEM parts houses not sure it will fit a earler or later truck model.

Again ford charges about 50 bucks for the kit and Amazon about 25 bucks.
Did this solve your issue by chance? I had the same issue with my '97 STX and I ended up lubing the slip yoke with the XG-8 grease and having a new carrier bearing pressed in on the driveshaft since its a two piece on earlier extended cabs. Just a thought...
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  #13  
Old 03-25-2013, 07:20 PM
bnvl76 bnvl76 is offline
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Question Re: Thump noise when slowing down - Repair Results

I removed the slip shaft spine from the rear drive shaft on the truck. It had blue Teflon looking coating on the male end of the spine. It was fairly clean but I cleaned the male and female spines just the same and blew them off with compressed air.

I applied the Motorcraft PTFE XG-8 Lubricant to both the male and female slip shaft as the Ford TSB 04-23-7 calls for. I used the entire 3 ounce tube.

I inspected the middle and rear universal joints while I had the rear drive shaft out of the truck, all-good; they have no corrosion, are lubricated and still move very smooth and free.

I re assembled the slip shaft and drive shaft and torque down the bolts that hold the rear drive shaft to the differential.

I drove it several miles and still made the thump/clunk noise when slowing down at about 15 MPH, but somewhat less noisier. But none the less the noise was still there.

I had the transmission rebuilt last month and returned it to the transmission shop twice for adjustments and still made the noise - the trans shop changed a servo and said the transmission was fine. The trans does shift and operate much better since rebuilding, but unsure if it is or isn't the transmission.

I also drained the differential a couple weeks ago by removing the differential cover and draining for several hours and installed synthetic (Lucas) diff oil that reduced some of the clunk/thump noise. The old diff oil was bad and appeared to be in the truck for some time.

What can I try next?

Could it be a bad carrier/support bearing on the driveline? A defective rear differential? Transmission problem? Bad front universal joint?

Please advise

Thanks
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  #14  
Old 04-13-2013, 11:55 PM
corrado guy corrado guy is offline
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I had same problem. Mine ended up being the pinion bearing. Try checking it.

----------

Jack up rearend with diff. Case off Put truck in park have someone try and rotate rear wheel back and forth and watch your pinion gear for play. Did u get it fixed would like to know or you check pinion gear for play?
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Last edited by corrado guy; 05-01-2013 at 09:36 PM.
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