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Quickie Transmission Refresh

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My current M10 rebuild project will use the 4 speed transmission currently in the recipient car.  The transmission is in good shape.  I want to give the transmission an external refresh before it  is mated to the new engine. 

QUESTION:  Anything I should I consider doing or replacing other than the following? 

  • cleaning
  • rear, front, and shifter shaft seals
  • backup switch
  • drain crush washer
  • fluid 

I did this 5 years ago and the aforementioned items are all I remember doing/replacing.





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You guys are sharp!


'76mint is correct.  Yep, I refreshed another transmission 5 years ago ('74 tii) and I am enquiring about a different transmission which is in a '70 2002, works quite well, and has an unknown history.  Best guess:  original ('70).  


Sorry, guys, I was not clear.



Edited by 2002#3
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  • Solution

In that case, seals for sure, if the reverse switch works run it.

Make sure the clutch pivot pin is ok, replace if worn.

I like this GL4 Trans oil, can be found relatively cheap on amazon, Summit Racing, Ebay


Edited by tech71
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76 2002 Survivor

71 2002 Franzi

85 318i  Doris

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If you are going to use a pressure washer cover the vent in the top of the case, you don't want to get water into the trans (it is hard to get out without changing the oil 2-3 times)  if it is on the bench change the shift shaft seal while you are there.  

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1970 1602 (purchased 12/1974)

1974 2002 Turbo

1988 M5

1986 Euro 325iC

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I wish I had the energy to clean as noted above (those look great).


But I don’t, especially after pulling transmissions off the shelf, inspecting and tagging, then loading them into the truck to take to the rebuilder (turning ‘gamblers’ into units I’ll install or sell).


Anybody have a part number for an Elring gasket/seal kit for 245 5 speeds? -KB



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