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post #1 of (permalink) Old 10-11-2000, 04:02 PM
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THUNK!

I'm hearing a strange "Thunk!" from the rear of the truck when I come to a stop then accelerate forward again. My Toyota used to do this when it wanted new u-joints but I just checked them and they are in execellent condition.

Any ideas what the sound might be?

Thanks

(And NO I don't have anything loose rolling around in the rear of the truck!)



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post #2 of (permalink) Old 10-11-2000, 05:02 PM
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post #3 of (permalink) Old 10-11-2000, 05:13 PM
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Re: THUNK!

Good idea from ARD. I have a question though, how did you check your u-joints? External visual or did you take them apart and look at the bearings? It sounds like u-joints to me, but it could be the brakes - if its not either of those, well... you have some more expensive rear end problems.

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post #4 of (permalink) Old 10-11-2000, 05:24 PM
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Re: THUNK!

I pulled the u-joints form the rear driveshaft to replace them but they were fine.

post #5 of (permalink) Old 10-11-2000, 07:58 PM
 
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Re: THUNK!

Also check that the U-bolts that hold the leaf springs on ae tight. You could be experiencing a little axlewrap.

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post #6 of (permalink) Old 10-12-2000, 07:20 AM
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Re: THUNK!

mine does that but it is my t-case is worn

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post #7 of (permalink) Old 10-12-2000, 11:36 AM
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Re: THUNK!

The Tahoe was doing the same thing. THe axle seal was leaking just a tiny bit, but enough to reap havoc on the rear brakes

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post #8 of (permalink) Old 10-12-2000, 05:30 PM
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Re: THUNK!

Here's some additional info...

When I apply the brakes firmly and come to a stop the rear of the Blazer "Sticks" up about an inch maybe two. When I let off the brakes to accelerate away from the stop it sort of "Falls" back down and THAT is when the THUNK sound happens.

Thanks again for all your input.


post #9 of (permalink) Old 10-12-2000, 08:02 PM
 
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Re: THUNK!

Sounds like one or more of your back body mounts is loose.

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post #10 of (permalink) Old 10-12-2000, 08:10 PM
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Re: THUNK!

Welcome to the GM Thump. Didn't tell us what you had but my guess is a 80's with a 208. THEY ALL DO IT. The drive line gets wound up as you stop and when you release the brakes it thumps the splines in the slip yoke. GM has some funky Blue grease that cures it for about a week.

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