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I’m wondering if my 99 Bmw 528i transmission with a bad engine can be a potential doner for a 98 bmw 528i with a good engine bad transmission help so I jump on the purchase before it’s to late

  • Welcome to Motor Vehicle Maintenance & Repair! While I'm not a BMW expert, I understand parts are very swapable between years and models. Since the 98 and 99 are both 4th Generation 5-Series (E39) and out of the same model (528i), I doubt there'd be any issue with the swap. Hopefully someone on here could tell you for absolute sure for you to make the decision. – Pᴀᴜʟsᴛᴇʀ2 Nov 7 '18 at 17:30
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Looking at Wikipedia, it appears there were two different automatic transmissions used in 1999. Depending on when your car was manufactured.

The two autos are the:

  • GM 4L30E - Used up until 06/98 manufacturing date.
  • GM 5L40E - Used from 07/98 to 03/00 manufacturing dates (inclusive).

There was only one standard shift tranny for either of the years, the S5D 250G.

If you have an automatic transmission and it falls before the 07/98 manufacturing date, you should be fine. If after that, then the two would most likely be incompatible. It looks as though, the standard version shouldn't have an issue.

Note: Some information was pulled from this source.

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