my 2wd 98 has done that before. When im slowing down in town and turn right, occassionally it will kind of "clunk". MY dad thought it was the posi rear, but it seems to come from teh front. Im not real sure what im gona do-probley nothing since it happens maybe once a week
Patrick

 

I took my truck in Friday and within driving my truck 1/2 a mile the tech turned around and came back. I was like WTF do you know what it is for sure already. He said "Yep, it's the steering shaft". I had my doubts and wasn't for sure if it was the problem.
They then told me it would be about $80 for the part and about $80 for labor. They couldn't find one in stock there and said it would be about 3-4 hours before they could get one. I figured I would have to come back another day or at least make another trip unless I wanted to sit there for four hours. They gave me two options take my truck and leave or they would "GIVE" me a loaner, turned out to be a rough 98 Escort. Notice I said "GIVE" they didn't charge me a dime for it. Like the service advisor said it's no Mustang but it's all he had to offer. I asked if he had one of the nice new SD's, but for some reason they just don't loan those out.... Dang it.
The night before I had went to www.fordpartsonline.com and found the shaft for like $60. I knew the service advisor, the tech and a few otheres there were fellow F150 owners and on a previous visit told them about this site and we chatted on my truck and Fords in general. Upon my return to pickup my truck I returned with a printout from fordpartsonline. I just casually mentioned I had found the same part cheaper and knew it took about 1- 1.5 hrs labor. He went on about business and I waited on my bill. He came back laid it in front of me and said " I went ahead a lowered the price for ya" He only charged me $68 for the part and $68.30 for labor, I was totally shocked.
Earl Floyd's in Carrolton has really taken care of me twice now. Both times the bill was at least $20 the estimated, quick, and actually pleasant.
While I was there I priced a new F150 7700 but thier sales dept. is not as generous. 32,7?? sticker, sale for around $28-29, x-planed at 26-27. I got hit that 25K and under market to afford the payments. Oh well, keep on lookin and dreamin.
Back on topic it did fix my bump bump feeling when turning and the steering is much firmer now. I still have something out of whack, it still feels like a tire out of balance. I will rebalance them soon at rotation. Not to much old stuff left up front to cause those kind of problems. I might replace a few more things then it might be time to use some warranties and replace new/bad stuff again.

 

I too have a 2001 supercrew with a 5.4 that clunks during turns. I do not think it has anything to do with the turn because I can duplicate the clunk without turning.

If I am coasting about 12 to 20 mph and then start to lightly accelerate similar to exiting a turn I get a downshift clunk. I am sure it is down shifting from over drive to third or from third to second. It is not downshifting to low. I have been to two or more dealers and have been told that it is normal. Mine is a 4x4 Lariat with a limited slip rear end. I believe the problem is in the transmission or power train control module. Since this is the speed I nomally make my corners (left or right) that is when I hear the shift clunk. I have about 14,000 miles now and the clunk seams more pronounced than when I first noticed it.

If anyone has a suggestion on how to get this fixed let me know, I do not like the noise and wish I could trade for something that works better.

 

As for the clunking on turns or starting out from a stop:

Problem existed from new...figured it out after 20000 miles!

I rotated the axle pinion angle up with shims...no more clunking. I believe the clunk was coming from binding on the front spline of the tranny to driveshaft created by too great of an angle at the rear of the drive shaft to the axle pinion flange (mine had a combined 5.0 degree relationship between the rear of the DS and the pinion flange...should be be no greater than 3 degrees to prevent binding/vibration and no less than 1 degree to assure lubrication and proper wear of the roller bearings in the u-joint). My stock pinion flange setting pointed downward 2.6 degrees (toward the front)...rear driveshaft flange angle was 2.4 degrees (pointing down) towards the rear...combined angle=5.0

Angles measured with an $8 angle protractor (magnetic base) from Home Depot.

You can try reversing the factory 1 degree shims (rotate 180 degrees)located between the leaf spring pack and the axle perches for the leaf packs to see if this eliminates the clunk. This will result in an upward rotation of 2 degrees in pinion angle...perhaps enough to eliminate the clunking.

Although the clunking existed from day one (new)...I picked up the drivetrain vibration and "grrrring" sound after doing a 2" shackle drop at 20000 miles. Clunk, vibration, and noise has been eliminated.

2001 SuperCrew/4r70w tranny/9.75LS axle

 

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