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Clunking noise and sensation from a standing start

My '95 Bronco (5.8L, Eddie Bauer) makes a noticible clunk -- 3 of them really -- when I start going from a standing stop. It also makes a nearly identical clunk -- single instance -- at the moment it comes to a full stop.

The first two clunks are somewhat strong, and the third is softer. The clunk at stopping is about the same as the third clunk.

I've replaced the motor mounts, and all three u-joints. I'm inclined to think the transmissioin mount is ripped to shreds -- the motor mounts were pure toast when I took them out -- but I usually feel a different symptom related to the mounts.

I assume my Bronco is the same as the F Series trucks (particularly the F-150 4X4) in this area, and I was wondering if I could get a sanity check before I went after the transmission mount. Have any of you guys found this clunk in your truck, and what fixed it?

PS My brother has a '94 (5.0L, XL) that has the same symptom(s).

Reply to
Jeff Strickland
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I had a '95. There was a bulletin where you had to pull the rear driveshaft apart, at the slip yoke, grease the crap out of the splines, then put it back together. I also drilled, tapped, and installed a zerk fitting in mine for grease later.

This fixed the clunking problem.

Spdloader

Reply to
Spdloader

"Jeff Strickland" wrote: '95 Bronco 5.8L, Eddie Bauer

Makes 3 noticeable clunks go I had a '95. There was a bulletin where you had to pull the rear driveshaft apart at the slip yoke, grease the crap out of the splines, then put it back together. I also drilled, tapped, and installed a zerk fitting for grease later. This fixed the clunking problem. _______________________________________________

That's what is so great about this newsgroup - someone who has solved the same problem will give a tip that might avoid days of aggravation looking for the cause, and save hundreds (or thousands) of dollars in shop labor.

Best regards to all ATFers.

Rodan.

Reply to
Rodan

Really? The driveshaft is the source?

That sucks, I just had it out for a new set of u-joints ...

Reply to
Jeff Strickland

The slip yoke was the source. Spdloader

Reply to
Spdloader

Reply to
Oneson

Hope it helps someone!

Spdloader

Reply to
Spdloader

The drive shaft slip yoke can indeed be the source. Sometimes, the yoke has to be replaced to correct the problem if it has worn because of the inadequate lube. Another source of clunk in the old Broncos is the front axle strut bushings. If you replace them, the urathane ones are a great improvement over the OEM or rubber ones. Beware the urathane bushings will transmit slightly more road noises and road feel. IMHO, the Bronco drives better with the urathane bushings by helping cut down on the road wander a bit.

Lugnut

Reply to
lugnut

My '02 F250 does this too, since new, I just haven't gotten around to taking the shaft apart.

Reply to
Matt Macchiarolo

Slip yoke? Do you mean slip joint? The 'shaft is a 2-piece shaft, correct?

Reply to
Matt Macchiarolo

Probably the wrong terminology on my part, but take the shaft apart and grease the splines.

Also, lugnuts suggestion about the radius arm bushings is another common source of "clunk".

Spdloader

Reply to
Spdloader

has anyone thought of checking the pinion nut? sometimes it will back off a little and cause a clunk and some vibration too. Hope this helps.

Reply to
BattleGodz

Reply to
Oneson

Guys, I worked at the FORD technical service hotline over the summer, and they are still seeing many problems with slip yoke (yes I mean slip yoke, same thing as a slip joint just different terminology for different people) and all they required was grease.. Some however did require running through the driveshaft angles and making sure all the working angles were within .5deg-3.5deg. Hope this sheds a bit more light on the subject.

Ford Tech

Reply to
Ford Tech

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