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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 07-02-2008, 01:57 PM   #1 (permalink)
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525 e34, transmission differences

Friend has a 525 e34 -92, engine m50, auto transmission 5hp18. Original transmission went out of order (no drive forward). He bought one for replacement from junkyard. It should be from 525 e34 as well but appears different.

Some photos:

Both transmissions, original on left side.


Markings of the replacement one:





And the original one:





Does somebody know about possible differences and about what should be checked when purchasing a repplacement trasmission to ensure compatibility ? There are some transmissions for sale nearby (in Sweden) but would not like to drive around the country with original one to compare. Any help greatly appreciated.

Last edited by wesku; 07-02-2008 at 02:06 PM.
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Old 07-02-2008, 04:54 PM   #2 (permalink)
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should be the same. the difference is only in the production #'s(origin) and the manufacture date.
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Old 07-03-2008, 06:35 AM   #3 (permalink)
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Holes for mounting to engine are different. It can be clearly seen when click the image to get larger image. Also it seems that engine angle is slightly different. Maybe it is from different body or engine anyway.
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Old 07-03-2008, 09:01 AM   #4 (permalink)
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Originally Posted by wesku View Post
Holes for mounting to engine are different. It can be clearly seen when click the image to get larger image. Also it seems that engine angle is slightly different. Maybe it is from different body or engine anyway.
yes, i just noticed... apparently, it's from a different engine but 5HP18, nonetheless.

Take a look at the mounting bolts on the rear of the bell housing. You just might be able to swap bell housing and it should work.

Also pay close attention to the size of the torque converter. same?

*When u say no drive forward... 2 things come to mind. TC issue or tranny issue. Have you changed ur tranny filter at all?
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Old 07-03-2008, 04:26 PM   #5 (permalink)
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*When u say no drive forward... 2 things come to mind. TC issue or tranny issue. Have you changed ur tranny filter at all?
Could it be TC issues as it moves fine with reverse ?

I do not know about the filter as this is a friend's car but will ask. Could filter change help ?
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Old 07-04-2008, 01:00 AM   #6 (permalink)
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Cool

TC and OIL PUMP issues are possible because the torque req'd for reverse wd be much less than moving fwd owing to the big difference in gear ratio.(if the tranny was still on the car, u can prove that by shifting into 1st or the lowest gear ans see if it will indeed move.

Then, internal in the tranny is the issue of bands. just like brake shoes, they wear out over time. sometimes, they are adjustable, and sometimes, they just burn out from heavy use.

Consider also... the valve body. a number of solenoids and ball valves that play and move around to shift the direction of ur tranny oil based on the gear that has been selected for the car to run on.... oil supply to these valves are coursed through a transmission filter... clogging of which results in oil starvation, and resultantly... no operation, partial operation, or faulty operation.

Diagnostics(from basic to complex) include:
1) measurement of oil level;
2) color of oil(darker brown colors indicate burnt bands/clutches
3) smell of oil - burnt oil will smell differently than fresh oil
4) resdue found in oilpans... i.e. metal bits in the oil???
5) oil pressures measured at different RPM's (for advanced tech's)

I don't have a lot to go by from what's been said concerning your plight... read on an see if ur prob is anything like the above, or expound more on ur issue. am sure someone here is always willing to help
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Old 07-09-2008, 12:42 PM   #7 (permalink)
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So im kind of having the same problem. 91 e34 525i and my transmission recently went out. Im not gettin a connection in some gears and the engine will just rev just like its in neutral. Do you think I should even waste my time by changing my transmission filter and oil? Or do I just need a rebuilt tranny?
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Old 01-25-2009, 01:46 AM   #8 (permalink)
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dead tranny?

E34 520i M50 ,,transmission was working fine, 10 hour drive, but when i got to my finnal destination it started going in and out of gear and locking up. Switch the engine off and restarted it and continued on my way. The next day i went for a short drive and it was doinf it again. Now tranny locks up in all gears and brings the car to a rapid halt after about i min of driving . Does it even in neutral when engine is running, brings the car to a halt , like having braks on. Its like there are multiple gears being selected at once. Ive changed the transmission fluid and it was very dark, buut hasnt been changed in a long time. Does anyone know what i should check out? could it be the TCU? or bands? any info would be a great help ,, thanks guys n gals
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