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axle or subframe? (archive)

[ Follow Ups ] [ 5-series (E28) Message Board ] [ Msg. Board FAQ ]

Posted by Rob Levinson on May 24, 1999 at 12:43:11:

In Reply to: 1988 538e axle mounting points posted by C.Rincon on May 24, 1999 at 12:05:09:

: Can anyone tell me how many mounting points are on crossmember for 1988 528e axle? Seems like two mounting bolts at forward of axle and two at top of axle pumpkin for mounting to crossmember? Checked a service manual and it looks like 5 mounting points for axle to crossmember. This crossmember just replaced in Oct.1998 and has now broken again at the two forward mounting points.

From your description, you're talking about the subframe. It mounts to the chassis using those two big subframe bushings, one in front of each rear wheel. Yes, those can rip apart from hard use (frequent dragstrip-type launches), but if yours are ripping frequently then you may have another problem like a bent subframe.

There's differential mounting assembly that also may have gone bad. You need to take it apart to see if it has separated, if that is broken then it will transfer stress to the subframe bushings.

When replacing the subframe bushings, get M5 parts. They will interchange directly and are stronger, cost difference is within 10%.

- Rob

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