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Replacement transmission for a 84 628 Ljet

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smashervt
Posts: 62
Joined: Mon Aug 31, 2015 3:08 am
Location: Vaughan, Ontario

Replacement transmission for a 84 628 Ljet

Post by smashervt » Thu Apr 08, 2021 2:14 am

Hey everyone. So I’ve been ordering parts to fix my transmission 5 speed and I think I might have to go the way of the used tranny. My issue is that I read motronic transmissions are different from Ljet and I’d like them to work. I believe I have a getrag 260 vin number WBAEA710508151229
1983 BMW 633csi (sold)
1991 BMW 318is (sold)
1991 BMW 325i (stolen)
1985 BMW 635csi (sold)
2005 BMW 330ci (totalled)
1994 BMW 325iC
2018 BMW M550i
1983 BMW 628csi

bpoliakoff
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Re: Replacement transmission for a 84 628 Ljet

Post by bpoliakoff » Thu Apr 08, 2021 2:59 am

The only two differences are the ones from a Motronic car have a provision for the reference sensors which you don't have to use. The other difference is if the trans is out of a later car it won't have a mechanical speedo drive. However, you can switch yours into it very easily. If you pull the tail shaft housing off your present one, you will see the gear which slides right off the shaft and will go onto the newer gear box. Best bet is to find a trans with a removable bell housing and it will be plug and play and be right for sure. It has nothing to do with the Ljet
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.

smashervt
Posts: 62
Joined: Mon Aug 31, 2015 3:08 am
Location: Vaughan, Ontario

Re: Replacement transmission for a 84 628 Ljet

Post by smashervt » Thu Apr 08, 2021 10:28 pm

That is good to know. Thank you very much!
1983 BMW 633csi (sold)
1991 BMW 318is (sold)
1991 BMW 325i (stolen)
1985 BMW 635csi (sold)
2005 BMW 330ci (totalled)
1994 BMW 325iC
2018 BMW M550i
1983 BMW 628csi

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86_6series
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Location: West Nyack, NY

Re: Replacement transmission for a 84 628 Ljet

Post by 86_6series » Fri Apr 09, 2021 12:19 pm

When I did my 5 speed swap, the tranny howled like a banshee. I found out how difficult
it is to get some parts and the bearings used where not a great design.

I wound up buying from Metric Mechanic. Jim explained his rebuilding process with
the modifications to enhance performance. He builds trannys for the BMW endurance racers.

If you plan on keeping the car for any length of time, consider a MM box.

https://metricmechanic.com

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