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1. #Old style to new style o2j trans shift assembly swap install#
2. #Old style to new style o2j trans shift assembly swap manual#

There you can see the relationship between the synchronizer sleeve (top), synchronizer (middle), and gear (bottom). The synchronizers slow the shift and match the speed of the gear to the synchro sleeve for a smooth shift. It is moved by the shifter to select either first or second gear. Here’s the first- and second-gear synchronizer sleeve. Rebuilding one isn’t for the timid, but it’s not impossible either. It looks complicated, but the Getrag 260 is actually a straightforward, tough transmission that can handle lots of power and even some abuse. Many people have successfully swapped them without difficulty, but to be on the safe side you can use a thicker Sachs throw-out bearing (PN 21-51-12-04-525) to make up the difference. The bellhousing is approximately 10 mm deeper than the later bellhousing. If you want to use an early transmission on a later engine there is one slight issue.

#Old style to new style o2j trans shift assembly swap install#

A few later transmissions were cast with an undrilled boss for the position sensors, so check carefully if you want to install one on your early eta engine. The first difference is in the crank-position sensor location. Many external parts are swappable, but each has some differences that can complicate swaps. They all have a similar external shift linkage. That means they can be interchanged relatively easily. All three are very similar because they have the same bellhousing bolt pattern and are the same length. There are three different versions of the Getrag 260 transmission installed behind six-cylinder M20 engines. A 30-mm thin-walled socket is needed and you may as well replace the rear seal while you have it apart. If you are replacing the same kind of transmission (automatic for automatic, 260 for 260), you can use the original driveshaft by swapping the output flange on the transmission case to match. Later cars can use either transmission (with some concerns noted below) but need to have the matching driveshaft. If you are swapping an automatic into an early car, make sure to stick with the early transmission to resolve both problems. In addition, there is a difference in the output flange of the transmission, matching the two different giubos used on the E30. This means that swapping from early to late is easier than from late to early, since there are no holes in the later bellhousing for mounting the sensor. The 1987 and later “super” eta engines and all 325i engines had crank-position sensors mounted to the front of the engine.

For one thing early eta engines have two crank-position sensors mounted to the bellhousing. With both automatics and manuals, there are some year-to-year differences in the six-cylinder engines that make seemingly straightforward swaps a little more complicated.

#Old style to new style o2j trans shift assembly swap manual#

There are two main reasons to swap transmissions in an E30: to exchange one worn transmission for a better one or to change from an automatic to a manual (more preferred). ( Taken from BMW 3-Series (E30) Performance Guide 1982-1994 by Robert Bowen)