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Difference Between 2002 And Turbo 4-Speed Gearbox


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I don't know why I could not reply to your post earlier. The Turbo 4 speed has a larger diameter main shaft, the selector hubs are different and the output flange is different because of a larger diameter spine on the shaft. There are a couple of bearings in the box that are different dimensions but the syncro rings are the same as the standard 2002 4 speed. The strange thing is the optional close ratio 5 speed for the turbo was the same 235 box they used in the standard 2002 they only strengthened the 4 speed. The ratios are the same between the 2 4 speed boxes

1970 1602 (purchased 12/1974)

1974 2002 Turbo

1988 M5

1986 Euro 325iC

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  • 1 month later...

I'm going to update this thread with my experience yesterday. I have a 2002 turbo transmission I'm selling for a friend (see parts for sale). I took Byron's advice that the way to verify it's really a turbo trani is to check that the output shaft has a larger diameter, and thus that the output flange has a larger hole, than a standard transmission. Below is the flange from the turbo transmission put on the output shaft of a Getrag 235. You can see that they both have 27 fine splines, but the hole in the turbo trani's output flange is much larger than the 235's shaft. Thanks Byron!

post-32582-0-42730600-1373972971_thumb.j

The new book The Best Of The Hack Mechanic available at https://www.amazon.com/gp/product/0998950742, inscribed copies of all books available at www.robsiegel.com

1972 tii (Louie), 1973 2002 (Hampton), 1975 ti tribute (Bertha), 1972 Bavaria, 1973 3.0CSi, 1979 Euro 635CSi, 1999 Z3, 1999 M Coupe, 2003 530i sport, 1974 Lotus Europa Twin Cam Special (I know, I know...)

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