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sounds like a suspension problem as weight being transfered around the suspension so get the springs and shock absorbers checked , easy check for shock absorbers, bounce car on each corner ,if car stops smoothly then ok but if continues to bounce after you've stopped bouncing it then the shocker is worn , get the springs tested at a garage as will need specific equipment etc
Get someone else to bounce the car while you lay on your back and look. We have no idea what the problem can be and you could have left a lot of stuff loose under there. Maybe you didn't tighten everything up. Check it with a friend bouncing the car.
think you have a shock absorber problem ,they can break inside well not exactly break but a valve sticks causing the vehicle to bounce more which you didnt notice but no doubt it happened then when bounced on the level crossing it freed itself again .Very rare but i have seen it before ,took ages to diagnose
Yes, dry needle bearings can make that sort of sound. I suggest a complete teardown and inspection of all the bearings in the rear suspension. Replace any that are rusted or otherwise worn excessively, then re-pack each with the recommended grease upon reassembly.
To prevent premature failure in the future, avoid directing high-pressure water spray at these areas when cleaning your bike.
if it's and SL or VR4 the carrier bearings on the propshaft( driveshave from front to rear on AWD) can get loose and cause a banging.
check for slop in the joints between the rear diff and the wheels. you really need to pull and push things around as hard as you can to find something loose enough. Also the whole rear diff is on a frame that hase bushings connecting it to the car so the busshings could have worn.
check the fluid in the rear diff for metal particles and make sure there's no slop in the diff. the propshaft going into the rear diff on the awd should have a small amount of play no more than 5mm.
You more than likely have one of two problems. One of your shock absorbers has a broken attachment bracket or 2) You have a broken exhaust bracket to your muffler. To check the shock just have the vehicle on a flat area motor turned off with emergency brake on and go to each side and "bounce" the vehicle using your body weight. Then to check the exhaust do this when motor is completely cool motor off emergency brake on and chock the tires so there is no chance the vehicle will roll. Get under the rear and attempt to move the exhaust assembly. If it moves to any degree side to side etc then it is this. If the vehicle bounces excessively when you bounce on it then it is the shock - repair accordingly. Hope this helps.
Does the drum turn smoothly, or does it bounce around? If it bounces, it could be the bearings in the drum wheels going out. The wheels would need to be replaced ($20 on up).
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