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Re: ZF 4 hp 22 automatic transmission

I'm abit concern about this posting 'cause I've got this automatic
transmission in my 86 325es. Even though I had acquired this car 2 years
ago with 90k miles, I have not had any problems (so far). In another
earlier posting there was discussion on failures at 60k-80k miles. Will I
be seeing repair bills soon? I hope not.

My only complaint of this ZF 4 hp 22 automatic transmission is the gear
ratio for 1st and 2nd. The initial acceleration is slow, its as if I'm
starting off in 2nd gear of a manual transmission. I'm actually thinking of
swapping out the diff from a 2.93 ratio to 3.45. This get me better
acceleration although takes some away from the overdrive 4th gear. Any
comments out there on this swap? I've heard others have swapped in a diff
with 3.73 ratio and the engine is rev'ed abit high at highway speeds,
~2800rpms @ 70mph. The 3.45 ratio would bring the rpms down to about
2600rpm @ 70mph.

Leon; 86 325es Dinan


>From: henri baccouche <henri@domain.elided>
>Date: Thu, 01 Aug 1996 19:16:08 +0000
>Subject: ZF 4 hp 22 automatic transmission
>
>I read the FAQ 12 regarding 7 series transmission failures at
>http://cbsgi1.bu.edu/bmw/new_bmw.html  and since I was thinking about
>newer   3 or 5 series automatic...........
>Are 86 and up 3 series and  5 series automatics reliable?
>
>         I may have answered my  own question.....  While looking at the
>service bulletins for BMWs at http://www.alldata.tsb.com  I found  out
>that the 4hp22  is the transmission for all the1986 and up 3 series and 5
>series and  that there are obvious reliability problems up to 1993. This
>transmission  appears to be a lemon up to at least1993.
>I am not  impressed. They could not fix this for7 years?
>Opposing views.......please.