4 speed to 5 speed swap

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tgloede96
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Posts: 1
Joined: Fri Apr 16, 2021 5:07 pm
My E21(s): '77 US 320i 4 speed manual

4 speed to 5 speed swap

Post by tgloede96 »

Hey,

I'm sure this has been asked before, but upon a quick search, I couldn't find anything.

A year or two back i decided I was going to swap my Getrag 242 4 speed for the Getrag 245 5 speed. I bought the transmission for the swap, but like all good project cars, time has gotten away from me, shame I know.

Anyways, I was wondering if there was a good write up of the swap. To my understanding its basically a simple mate up to the engine, the drive shaft is the tricky part, which will need to be shortened, and rebalanced.

Does anyone know the specs that I will need to get it shortened by?

Any info would be heavily appreciated, I've neglected this gem for too long, and this Spring is the time to return her to her former glory. Cheers!


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Jeroen
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Posts: 29199
Joined: Tue Sep 14, 2004 12:23 pm
My E21(s): '81 323i Baur
Location: The Netherlands
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Re: 4 speed to 5 speed swap

Post by Jeroen »

Try the FAQ for starters ;)

But yes the swap is pretty straight forward

https://www.bmwe21.net/forum/viewtopic.php?f=38&t=13418
Regards/groeten, Jeroen
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