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loud bang in rear end at low speed when accelerating


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aaronwelch
New User

Apr 11, 2011, 7:44 AM

Post #1 of 3 (3974 views)
loud bang in rear end at low speed when accelerating Sign In

I have a 2003 f150, 4.6 v8, 2wd, automatic . It makes a loud bang when I take off, and when it gears down while braking. Wheel bearings?? Can I do it myself?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 11, 2011, 9:44 AM

Post #2 of 3 (3961 views)
Re: loud bang in rear end at low speed when accelerating Sign In

Hmmm - U-Joint(s) I would check first. If you jack up differential so wheels are off ground see if spinning them by hand can help nail it down. Wheel bearings don't generally "bang" but I won't say they couldn't. It's probably going to take, taking apart for a good look if truly inside differential,

T



chzyrider
New User

Apr 14, 2011, 12:45 PM

Post #3 of 3 (3935 views)
Re: loud bang in rear end at low speed when accelerating Sign In

If idle is set too high, it can make a loud clunk sound as you put it (auto trans) in gear as it takes up any play in the entire system. The part with the most play commonly makes the most sound. Check U-joints first. After lifting vehicle if needed for access, push/pull the driveline up & down and side-to-side to check for any play at the u-joints and yoke bearings. Worn yoke bearings can cause clunk sound as it loads and cocks to one side. You may also be dealing with any play in the differential and trans as well and can difficult to see if the u-joint is actually moving within the yokes. If none is seen or excessive by push/pulling, then grab the yoke with one hand and twist the driveline back & forth to check for any play at both ends. Any movement seen at all in the u-joints requires replacement. You can check for excessive play at differential by twisting rear yoke back & forth (set e-brake to lock wheels). Wach for amount of play and listen for clunk sound as pinion gear tooth face of the gears make contact on accell and decel sides. If clunking sound heard, ask yourself, "Is that what I am hearing"? You should have some play in the differential gears, but the yoke should not rotate more than 1/4 inch or so. If these tests seem okay, check motor and transmission mounts.






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