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Old 02-15-2013, 07:34 PM   #1
paul1's Avatar
Join Date: Dec 2012
Location: New York
Posts: 45
thud sound when gas pedal pressed

2006 4.0 4spd auto. Sometimes after I let off the gas,coast, and then re gas it, there's a thud or conk that comes from the rear (I think). Is it my differential or pinion?

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Old 02-15-2013, 07:49 PM   #2
Join Date: Nov 2012
Location: Central PA
Posts: 776
Probably your u-joint?


1998 Jeep Wrangler
4.0 : 5 Speed : Green with Black hard top : 33X12.50 Parnelli Jones Dirt Grip's on Eagle Alloy 15x7's : e-AutoGrille's Rock Crawler front bumper with an Engo E9000 with synthetic line
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Old 02-15-2013, 07:51 PM   #3
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Join Date: Sep 2011
Location: Kenosha, WI
Posts: 2,467
No a bad ujoint or dry one tends to screech or squeal. U could try putting grade in it tho to lube it
17 and ignorant
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Old 02-15-2013, 08:04 PM   #4
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Join Date: Dec 2012
Location: New York
Posts: 45
I was thinking that the pinion or dif could be worn down. I'll check my ujoints,it has 76000k btw
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