What do I need to replace?

[pfahls1]

My 325es feels like I am running over "rumble strips" when accelerating in first and second gears. I'm assuming it's suspension related. I know it needs shocks/struts but are my bushings bad too? What should I replace? What should I replace them with? What's the best place to purchase them? I've searched and posted a few dif places with this and still not sure what I need to do. I'm new to BMW's and still learning.

Thanks.

[jlevie]

If this vibration is worse with more throttle and not present when very gently accelerating, it is almost ceratinly from a failed CSB. Since in almost all case a failure of the CSB is caused by binding u-joints in the drive shaft, both must be replaced.

[pfahls1]

If this vibration is worse with more throttle and not present when very gently accelerating, it is almost ceratinly from a failed CSB. Since in almost all case a failure of the CSB is caused by binding u-joints in the drive shaft, both must be replaced.

It is worse with more throttle. I can let off the throttle and it dimenishes.
So, I need CAB's and a new u-joint? There is also "slack" in the drive train somewhere. Would that be a bad u-joint? What would cause the u-joint to bind in the first place? -Worn shocks/springs? What is a good replacement for all? This is a daily driver.

Thanks,

pfahls1

[KenC]

Buy a rebuilt driveshaft with the CSB installed already. Don't try and replace the CSB. Just get a whole balanced shaft. I speak from painful experience.

[pfahls1]

Buy a rebuilt driveshaft with the CSB installed already. Don't try and replace the CSB. Just get a whole balanced shaft. I speak from painful experience.

I think CAB = Control Arm Bushing but what does CSB stand for? Center Shaft Bushing? I'm a noob after all.

Thanks.

[KenC]

Center Support Bearing... it's in the middle of the driveshaft. The symptoms you describe lead me to believe that it's the driveshaft, and not your suspension, that is the issue.

[jlevie]

It is worse with more throttle. I can let off the throttle and it dimenishes.
So, I need CAB's and a new u-joint? There is also "slack" in the drive train somewhere. Would that be a bad u-joint? What would cause the u-joint to bind in the first place? -Worn shocks/springs? What is a good replacement for all? This is a daily driver

You need a new CSB (Center Support Bearing) and driveshaft. Slack in the drive train can also be caused by bad u-joints and/or a bad CSB. The cause of u-joint failure is wear and lubricant failure. The u-joints in a BMW drive shaft are sealed and when the lube gives out the bearings wear and bind.

[pfahls1]

Thanks Guy's,

I see ramanufactured ones for around $360.00 online in a few places. Do either of you have suggestions on where to buy from?

Thanks.