Question about 2004 Ford F150

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Rear=end clunking Sounds like the rear-end of the 2004 F150 Lariat is changing gears very hard. One place said I needed a rear-end expert but I took it to Goodyear and they it needed a slip yoke and fluid differential exchange. It does not seem this has fixed the problem. It has become more frequent in the past several months and sometimes it tries changing gears so hard, I'm not sure its going to change at all. Anyone else having this problem?

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  • Nan T Mar 12, 2009

    It sounds like the transmission is slipping and shifting hard. I paid $295.00 yesterday for a R&R Driveshaft and Grease slip yoke with Differential synthetic fluid exchange. Within five miles the tranmission made this same "clunk" noise I call it, which sounds like the transmission is slipping....

    I called the mechanic back and he says perhaps "they put too much grease back in, as you had to be very careful with the amount or the slip yoke would not work properly." I have to take it back in tomorrow but just very annoyed.

  • Nan T Mar 12, 2009

    I did have the transmission service exchange and treatment at 59K as I was told this had to be done at 60K as well. The shifting just worries me as I know this could be a huge expense if somethng goes wrong and told them if this is a HUGE problem, then let me know and I'll trade the truck in before that.

    I have always taken care of my vehicles and service them every 5K as well as the manufactures recommendations but seem to always get screwed. I just paid $415.00 as well for the spark plugs to be changed out and the truck really don't run any better.

    Sure wish you were near Roswell Georgia. You seen to know what you're talking about and will tell it like it is! I certainly appreciate all your time and information.

    Thanks so much!!!!!

  • yadayada
    yadayada May 11, 2010

    the rear end would have nothing to do with gear changes, this sounds like a transmission issue, please think about the symtoms and write me again.



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Too much grease? that is a load of u know what, I am aware of the slip yoke noise, there is a Technical Service Bulletin (TSB) form Ford, did he use the special Teflon Grease (a 100% must use) to lube the slip yoke? regular grease won't do. I also think you have something going on with the trans, has it ever been serviced (fluid and filter)? it should be done at least every 60,000 miles, worn out fluid can cause erratic shifting of the trans. I m a Ford dealer technician of 20+ years and a Ford certified Master Technician and ASE Master tech.

Posted on Mar 12, 2009

  • Thetonycloyd Aug 20, 2011

    Hey ford tech. Can you help me out? I've got a diff prob. Started as a humming when I pushed the throttle, then while on the interstate turned into a clunking noise(loud)and then to a screaming noise(even louder)! Noticed that diff had leaked dry! Didn't seem to be any noticeable wear or metal shavings when I took cover off? Filled it with gear oil,started driving it with the same probs as before. Except I noticed oil leaking from pinion/drive shaft area. Was told it was bearings and seal.seems likely too me,but should I just replace the bearings and seal? Or should I just buy a whole rear from the junkyard and swap it out? Changing the whole rear seems easier to me? Is it not? Help! Please !!

  • yadayada
    yadayada Aug 20, 2011

    The noise you have is bearing noise from the pinion bearings so I personally would change out the pinion gear bearings (2), but that takes special tools to set the rear end back up as well as press the bearings on and off, if that isn't done correctly you get gear howl. If you have a factory manual and can borrow or have the tools needed to reset pinion depth and backlash then just do the bearings, if not just swap out the whole unit, that is the quickest thing to do.



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