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rearend bump while breaking

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Old Apr 4, 2004 | 10:37 AM
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rearend bump while breaking

i get a rearend bump when i come to a stop while breaking. i have a fully electronic 4 speed with OD, 97 ford xtl with 113k. i just had the tranny's fluid and filter changed yesterday but a day later the problem still persist. any similiars. thanks for your insight.
 
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Old Apr 5, 2004 | 10:37 PM
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check your upper control arm on the rear end were it bolts to the body. if this bolt comes loose it makes a good bump noise as you discribed. mine did this and it took me the longest time to figure it out. this bolt must be very tight.
 
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Old Apr 8, 2004 | 07:39 PM
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i placed the car in neutral while coming to a stop. i did not feel a bump. i believe that i have ruled out the brakes and suspension. i also had the drive shaft checked. it was tight and without movement. furthermore, i allowed the car to coast down a hill while in 1st gear then i applied the brakes and did not felt a bump.
the car feels like its sluggish and lacking power upon accel. after accel, when i come to a stop i getting a bump. i believe that it is the tranny. any insights or tests i could do to confirm. what could be causing this.
 
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Old Apr 8, 2004 | 10:01 PM
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if your idle is too fast it can cause this
try shifting to nutral before come to a stop. if you do not get the bump then your idle speed needs to be lowered.
 
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Old May 8, 2004 | 10:11 PM
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i believe that my differential is going. anybody having similiar symptoms and what is this going to cost me? is it better to rebuild or just put in a completely new rearend?
 
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Old May 9, 2004 | 12:32 AM
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if the rear end is quiet while your driving i really doubt that is is bad. they usually make whinning noise all the time or a lot of noise when they are bad.
 
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Old May 9, 2004 | 02:11 AM
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Check the rubber mount that holds the transmission to the cross member. Could have the nuts loose or the rubber has broken away from the mount.
 
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Old May 9, 2004 | 06:56 AM
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i have seen where the carrier will wear againt the pin in the diff an it will do a clunk when u got in to 1st gear an some times it would clunk leaving from a light. it would sound like it was u joints or bearing worn out .
 
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Old May 11, 2004 | 01:01 PM
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had it checked out. appears rear bushings in the stablizer bracket are worn. the bracket that attaches the rear axle to the frame. put the car on a lift and the whole rearend moved. a/b wants $240 for the job. the bushing kit cost $36 plus 2.5 hours of labor @ 80 bucks.
 
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Old May 11, 2004 | 07:26 PM
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my earlier post suggested that you check the rear bushing that bolts to the body. mine made this same noise and all i did was tighten up the big bolts with a breaker bar
but yours could be worn out but i would ??? that because those are big giant bushings that move very little under normal driving. good luck
 
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