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E30 Transmission Information

 
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dale



Joined: 22 Aug 1999
Posts: 3083
Location: Seattle, WA USA

PostPosted: Tue Jan 12, 2010 4:45 am    Post subject: E30 Transmission Information Reply with quote

Firstly, all 'i' motors use a crank position sensor on the front of the crank, all 'eta' motors (super-eta may be an exception) use the 2 reference sensors mounted in the trans bellhousing.

Also, don't try pulling the transmission apart. Most of the shops in this area won't even try to dig into one because you can pick one up at a salvage yard anytime for $300 or $400.

There are a couple of issues using an '86 325e manual transmission in an '89 325i car.

Identify which trans you have early 'eta', late 'eta', or 'i':

a) early 'eta' trans (1983, 1984, 1985 manufacture dates?)
i) 260.0.1270.90 is on the side of the 'eta' trans
ii) shifter mounting about the output flange is only 2xM10 holes for the 84,85,86 style plate mount shifter
iii) deep bellhousing : Slave cylinder mounting flange = 6 7/8
iv) 2 drilled holes for crank position sensors
v) smaller output flange

b) late 'eta' trans (1986, 1987, 1988 manufacture dates?)
i) 260.0.1270.90 is on the side of the 'eta' trans
ii) shifter mounting about the output flange has 2xM10 holes for the 84,85,86 style plate mount shifter, AND top boss for the aluminum bracket of the 87-91 style shifting mechanism.
iii) shallow bellhousing : Slave cylinder mounting flange = 6 1/2
iv) cast boss for 2 drilled holes for crank position sensors, may or may not be drilled
v) larger output flange

c) 'i' trans
i) 260.0.1346.90 is on the side of the 'i' trans
ii) top boss for the aluminum bracket of the 87-91 style shifting mechanism.
iii) shallow bellhousing : Slave cylinder mounting flange = 6 1/2
iv) no cast boss in bellhousing for reference sensors
v) smaller output flange


If you find your 'eta' 260 trans has the deeper bellhousing, you can correct for it by using a thicker throw-out bearing.
Sachs P/N 21511204525 is a 30mm bearing and will make up the difference.
BUT! many people have done the conversion without the thicker TO bearing without any trouble.

If you use the driveshaft/guibo that came with the transmission you'll be fine, the differential end of the driveshaft is the same on all the 6cyl E30s.

All 3 versions have the same gear ratios:
1 3.83
2 2.2
3 1.4
4 1
5 0.81

====================================
Some pictures of a 'late eta' getrag 260:
http://www.unofficialbmw.com/getrag_260/

http://www.unofficialbmw.com/getrag_260/images/

see the date stamp in the bellhousing in this pic, and also the slave cylinder mounting point to measure bellhousing depth:


this clearly shows both early and late shift lever mounting styles, this has the later style shifter support installed:


top view of shifter support mount


this shows the part number and sensor mounting points on the bellhousing:


This shows the parts used for the sheetmetal style early shifter mount,
bolt #2 goes into the rear of the transmission:


This shows the parts used for the later style shifter mount:


Part #2 in this E30M3 shift lever image is a bracket that _may_ allow using an early style transmission in a later car that came with the newer style shifter mount.
BMW Part #s
Code:

02   Bow      1         25112225369   $5.18   
03   Hex bolt   M8X140   2         07119912588   $5.19   
04   Bearing sleeve, round   L=26MM   1         25117519669   $11.92   
05   Pin      1         25112225344   $4.97   
06   Self-locking collar nut   M8-8-ZNS   1      07/2007   31331092887   $0.58   
06   Self-locking collar nut   M8-8-ZNS3   1         07119904295   $0.36   


http://www.realoem.com/bmw/showparts.do?model=1003&mospid=47312&btnr=25_0081&hg=25&fg=05


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