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BMW ZF 3HP-22 Transmission
This article discusses the ZF 3HP-22 transmission for the 1982 and 1984 E28. If you're not here for the technical analysis but would rather buy a used unit from us, guaranteed to work and fit, then please select the link below:
Last Updated: 08/30/2017
Parts Group: Transmission
- Transmission (Automatic transmission), as on: E23 through 1983, E24 through 1983, E28 through 1983
- Transmission (Automatic transmission), as on: E23 with M30B34 engine, E24 with M30B34 engine, E28 535i
- Transmission (ZF 4 HP-22 with tail shaft tailored to E23, E24, E28, Automatic transmission), as on: E23 1984 only, E24 633CSi 1984, E28 528e 1984 and on, E28 533i
- Transmission (ZF 4 HP-22 with tail shaft tailored to E28 528e, Automatic transmission), as on: E28 with M20 engine from 1984
- Transmission (ZF 5HP-24, letter code TB. Upgraded), as on: E38 740i M62 016 TB 01/97-09/98, E39 540i M62 016 TB 01/97-09/98, Part Number: 1058000016
- Transmission (ZF 5HP-30, letter code ML), as on: E32 740i or 740iL, E34 540i, Part Number: 1055000010
A client with a 1979 BMW E23 630CS contacted me, looking for part internal to this transmission. His speedo drive gear has issues and he doesn't just want to plug the hole, but fix it the right way. I love that.
It'd be nice to help a 630CS be complete ... super rare and cool cars.
Sadly I've sold my last 3HP22 and I don't have another one, or any parts ... I've checked with the US ZF distributor and also struck out there.
So, what are good options? That transmission got superseded by the ZF 4HP-22 which showed up in 1984 on BMWs, so we can expect to find ZF 3HP-22 transmissions on the automatics through 1983 which to me means the E21 (320i), E28 (528e, 633i), E24 (630 CS, 633CSi), E23 (733i) ... those are quite a few options.
And I doubt BMW was the only company that used this transmission, since ZF is an independent company.
I could start hunting for a transmission but essentially I'd want to sell the whole thing, not just the speedo gear. So I asked the prospect if that's in his budget, buying an entire transmission, assuming I can find one. Then again, another option might be to upgrade to an 4HP22. The bell housing should be the same. In the long run that would help keep the car on the road. One important question is: is this a concours show car that he'd like to keep totally original ...?