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Discussion Starter · #1 ·
so had new u-joints installed but, the bumping is still there. still there, right under the tunnel.
so i snopped around and found that i can move the driveshaft into the transmission about 1/8 of any inch . i cant do this at all on the rear end side, tight as a drum.
happens mostly during acceleration and deceleration and sometimes around a corner, which makes me think that if i can move it, the torque of the engine can surely move it..

is this the problem and what is the cure?
 

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If you can move the yoke in and out of the tranny, but not the rear, where's the slop coming from? U-joint straps tight? Did you do the joints or did you have it done? Check the shaft yoke ears, and make sure the holes aren't elongated.. If they are, the steel is stressed and you'll have to have it rebuilt soon or you'll start to eat u joints. That movement is probably not causing the bump, but it's related to what is. Find where the slop is and let us know...

Matt {peace}
 

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Discussion Starter · #3 ·
and this is why i love this place....cause i cant even think to connect the dots about play on one end and not the other.
well, i will crawl under there again but im not hopeful about seeing anything i missed the 1st time.
 

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ok your not a monkey#1 have had a sim. prob. it was 1 st tranny mounts, 2 nd both engine mounts bad... if you havent checked them,, could be /// quinn GL
 

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Yeah, my guess would also be the motor mounts, and/or transmission mount allowing the engine to flex to one side.

This is fairly dangerous, but you can put the nose of the truck against a very solid object (mountain side, wall backed by dirt, VERY large tree...) and in gear, with the hood open, apply some throttle and watch to see if the engne lifts or shifts... to prove a broken motor mount.
 

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would the driveshaft need greasing? when i had an underbody clunk, it turned out to be an exhaust heat shield hitting the floor board. just a simple tac weld and the problem was fixed.
 

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ive got a 3inch body lift on my r/c, and it does the same kind of clunk, i havent figured it out yet either
 

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have you checked the slip joint on the driveshaft? could be worn.
also, are you sure it is the rear shaft, if this a 4wd could be a bad ujoint in the cv joint on front shaft, i had one of these go out on me at 70 mph and i thought the truck was coming apart, sounded like someone was under there with a 10 pound sledge just a whaling away

eric
 
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Does the clunking have a pattern to it (does it vary with an engine speed) or is it irregular??

What you describe is typical of a wasted shockmount or a loose shock bolt if it is irregular.

19464
 

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Smokey said:
Yeah, my guess would also be the motor mounts, and/or transmission mount allowing the engine to flex to one side.

This is fairly dangerous, but you can put the nose of the truck against a very solid object (mountain side, wall backed by dirt, VERY large tree...) and in gear, with the hood open, apply some throttle and watch to see if the engne lifts or shifts... to prove a broken motor mount.
Why can't you just power brake it to check the motor/tranny mounts. No, I wouldn't stand in front of the truck either... ::)

-SM
 

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i had a bump under the truck once. turned out to be a loose exhaust pipe. usually is the simplest things
 

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i heard a clunk under my truck once it turned out to be a volkswagon
 

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Well, on mine, the trans/tcase mounting bolts had come loose and the tcase would rise about 1" if ya got on it hard. There are rubber bushings that wear out on the mounts. Check them out. There is a steel sleeve inside the mounts, so just tightening them may not be enough.

It could also be a bad motor mount. Yes, power braking will show it. Just watch the engine with the hood up. Make sure to do it in reverse too.

Also check to be sure the trans is still bolted securely to the engine.
 
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