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Discussion Starter #1
Hi,

2004 Dodge Ram 1500 4x4 SLT. 170,000 miles. Noticed a vibration four months ago. Back end bouncing while braking. Replaced brakes and a bad caliper. Also noticed rear shocks were bad (6 years old). Replaced all shocks (Monroe blacks). Started going through worn parts. Replaced all suspension bushings (except body isolators). New rear springs/shackles. New upper and lower ball joints. New Wheel hubs. New u-joints on drive shafts. New axles in rear and cv joints. Inspected both axle housings and replaced fluid/no shavings. Truck is tight. I have always had a shimmy since we started this project. It is a rebound vibration. It occurs consistantly but only when the truck is reacting to dips in the road - then it shimmys (feels loose). One year old tires were recently road force balanced. Based on when and how the vibration feels, I don't believe it is the tires, drive shaft, trans, xfer case, engine, rear gears... due to it not happening all the time but at all speeds, all rpms, in gear or nuetral (while going 40mph)... but rather when the truck is reacting to the road. I removed the front drive shaft and the vibration is still there. I was going to remove the rear and drive around in HI, but want to make sure I don't have a slip yoke in the rear of the xfr case that can come out and leak fluid (first question). I am leaning towards the bed of the truck above the frame. There is some rust at joints on the ribs of the bed floor from the underside... Any other thoughts are appreciated.
 

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Maybe the front suspension is worn. If so, it might dive too much under braking, unloading the rear and making it hop. You could add a bunch of weight to the bed (bags of sand or concrete mix or whatever) and see if that counteracts it.
 

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Discussion Starter #3
Thank you.

Fronts suspension has new cv joints, new stablizer bar bushings and end links, new upper control arm and ball joint, new lower control arm bushings and ball joint, new hubs, and new shocks. No noticable diving - everything seems new and tight.

Today I am going to reinstall the front drive shaft (since that is not the problem) and disconnect the rear shocks and see what I get. I also don't think it is the trans, xfr case, or rear shaft since i was able to do a water burn out and no vibration. I am convinced this has to do with the empty bed and the welds/oil canning of the bed, so removing the rear shocks should make it nice and bouncy and eliminate the harse rebounding I am experiencing. I am going to take a deeper look at the bed and see where it could be coming apart from the bed frame above the cushion isolators. My welder is on standby and I also have a rental car on standby. This sucker is making me physically sick after 60 minutes of driving...

Any other thoughts please keep them coming.

Thanks!
 
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