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Thread: 4 spd VS 5 spd parts

  1. #1
    Join Date
    Feb 2024
    Eugene, OR
    My Cars
    1978 BMW 320i

    4 spd VS 5 spd parts

    Hello! I have a '78 e21 320i auto. I'm doing a manual swap. I just got a 5 speed out of a different e21. I found a parts car, but its a 4 speed. How many of the transmission parts are interchangeable? Driveshafts, trans mount, etc. Any info is greatly appreciated! Thank you!

  2. #2
    Join Date
    Sep 2011
    My Cars
    1987 BMW 535iS
    You will need the driveshaft from a five speed car. You will also need to determine the model year of the car that your five speed came from. Model year 80 used a four bolt output flange while the 81-83 models used a three bolt output flange. The 83 model also used a driveshaft that is longer than the driveshaft used on the 80-82 models. Also if your five speed is from an 83 model the shift platform and linkage are different from the 80-82 models.

  3. #3
    Join Date
    Nov 2007
    Sacramento, California
    My Cars
    1980 BMW 320i E21 M10B18


    As Ascot said with 80-82 are Getrag 245 5 sp, 83 is Getrag 240 5 Sp. The Getrag 245's come with steel shift forks while Getrag 240 are aluminum shift forks, steel shift forks are more desirable for the higher output motor shifting in that they are stronger. 245's are usually 2x-3x the price of 240's.

    Last edited by 320iAman; 02-18-2024 at 09:43 PM.

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