Rear diff fluid change - noise
Ok, I am still trying to get to the bottom of a clunk in what I think is the rear end of my truck. Bottom line, I get a clunking sound when I turn at low speeds, and it appears to come from the rear of the truck.
Sound reminds me of the clunk I had for a while when my spare tire was loose, but that is tight right now and clunk is happening. I had the truck up at a tire place, asked them to do a shake test, nothing. So, now I am wondering if it is my differential. I was having some chattering taking off about 25k ago, so I changed the diff fluid adding the Motorcraft friction modifier in the proper amount, and hadn't had a problem till recently. So, is it possible that the fluid and friction modifier is no longer working, requiring a new change? This is a daily driver, 2wd, no hard driving, no off reading, no towing. Any other ideas? It has the original tie rod ends and front end as best I can tell. |
Originally Posted by Prof
(Post 4957917)
Ok, I am still trying to get to the bottom of a clunk in what I think is the rear end of my truck. Bottom line, I get a clunking sound when I turn at low speeds, and it appears to come from the rear of the truck.
Sound reminds me of the clunk I had for a while when my spare tire was loose, but that is tight right now and clunk is happening. I had the truck up at a tire place, asked them to do a shake test, nothing. So, now I am wondering if it is my differential. I was having some chattering taking off about 25k ago, so I changed the diff fluid adding the Motorcraft friction modifier in the proper amount, and hadn't had a problem till recently. So, is it possible that the fluid and friction modifier is no longer working, requiring a new change? This is a daily driver, 2wd, no hard driving, no off reading, no towing. Any other ideas? It has the original tie rod ends and front end as best I can tell. |
which wt did you put in. You know there is a service bulletin out on this that says I believe to put 90-140? with Ford friction modifier in.
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check some easy stuff like the tailgate as well. I had a clunky noise coming from the back and ended up being the tailgate. I thought it would be something worse. I packed the tailgate hinges with grease, and lubed the latches and it went away.
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Hmmm...I will check on the fluid. When I changed the differential fluid, I removed the whole cover, so I could get to the bottom of the pumpkin, and it was clean - no particles what so ever.
Hadn't thought about the tailgate, I will check that... |
heavy Oil
Originally Posted by Prof
(Post 4958751)
Hmmm...I will check on the fluid. When I changed the differential fluid, I removed the whole cover, so I could get to the bottom of the pumpkin, and it was clean - no particles what so ever.
Hadn't thought about the tailgate, I will check that... |
You shouldn't have to do another diff service at 25k, so I would rule that out.
Something obvious and dumb... is there anything in the bed that may be moving around? What about tight u bolts and or leaf springs? |
Thanks for the responses...
Ok, the fluid I used was Amsoil 75/140; is this too light? Where the hell do I find 90/140? I have been up under the thing, and I can't see anything that is loose, leafs are tight, spare is tight, bed appears to be tight. This only happens when I turn too, not on acceleration or deceleration, which I think rules out u-joints, doesn't it? I can't see or hear anything in the tailgate that would lead me to believe it is that, but I am going to get in there and grease it up anyway. Now, I have a POS ARE brand cap, that I guess could be moving around when I turn, but all the bumpers appear tight and I see no unusual wear...so I am still stumped. |
It is 75 140
Originally Posted by Prof
(Post 4964088)
Thanks for the responses...
Ok, the fluid I used was Amsoil 75/140; is this too light? Where the hell do I find 90/140? I have been up under the thing, and I can't see anything that is loose, leafs are tight, spare is tight, bed appears to be tight. This only happens when I turn too, not on acceleration or deceleration, which I think rules out u-joints, doesn't it? I can't see or hear anything in the tailgate that would lead me to believe it is that, but I am going to get in there and grease it up anyway. Now, I have a POS ARE brand cap, that I guess could be moving around when I turn, but all the bumpers appear tight and I see no unusual wear...so I am still stumped. |
http://www.fordproblems.com/tsbs/F-150/2004/ Try this. Its a paid deal but here is another
http://www.ford-trucks.com/tsbs/?tsb...tsbmodel=F-150 also you can google anything on the internet. |
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