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Thread: Is someone able to identify my transmission?

  1. #1
    Join Date
    May 2009
    Location
    ACT, Australia
    Posts
    47
    My Cars
    1977 E21, 1977 E24

    Is someone able to identify my transmission?

    Hi all,

    My car was a factory automatic, but sometime in the 80's it was converted to manual.

    This gearbox has stripped the hardening on first gear, so i'm trying to source a replacement gear or even a whole gearbox, but it's proving hard. I've bought GM gearboxes, had leads on BMW gearboxes but with fins etc, none seem to match what I have.

    I was hoping someone here with much, much knowledge than me may be able to identify it via photos...

    It's a 5 speed with a normal 1st gear. Casting reads 262.0.510.00.

    Thanks






  2. #2
    Join Date
    Feb 2009
    Location
    Pittsburgh, PA
    Posts
    1,718
    My Cars
    '86 635CSi, '08 128i
    Getrag 265/6
    Save the manuals!
    '08 128i 6MT, '86 635CSi 5MT (B32, Motronic 1.3, WBO2, G265, 18# FW, 3.46 torsen)
    Past projects:
    '96 318iS, sold 4/23 '90 535iM, RIP 1/23 '90 535iA RIP 6/22 '91 318i, sold 7/19 '97 M3 sedan, sold 11/18 '85 735i, RIP 2/18 '92 325iC, sold 7/16 '91 318iS, sold 6/16 '84 745i, sold 10/14 '82 633CSi, traded 9/12 '90 325i, RIP '87 325 sold '89 525i, traded '87 325iS, RIP

  3. #3
    Join Date
    Aug 2008
    Location
    Sydney Australa
    Posts
    2,482
    My Cars
    1x633, 1x E3 2 DR Racer
    Quote Originally Posted by DesktopDave View Post
    Getrag 265/6
    Which I believe is the 5 speed dogleg with final ratio 1:1. A valuable box that in Aus sell for $1,2500 to $1,500 in good working order.

    I paid $850 for mine but it was noisy and ended up with a $750 rebuild.
    1977 633 CSi RHD Euro. S38B38 3.9L M5 Transplant. 5 Speed Getrag Dogleg. 3.73 LSD. 417hp, 369lb/ft
    1971 3.0CS E3 2dr Alpina Special Coupe Racer, 347hp, 295lb/ft

  4. #4
    Join Date
    May 2009
    Location
    ACT, Australia
    Posts
    47
    My Cars
    1977 E21, 1977 E24
    Who rebuilt it? Mine is at the transmission shop, but parts to fix it are scarce.

    Mines not a dogleg box and 5th is an overdrive gear

  5. #5
    Join Date
    Feb 2009
    Location
    Pittsburgh, PA
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    My Cars
    '86 635CSi, '08 128i
    Metric Mechanic offers rebuilds in the United States, but I'd figure there are other outfits down under that perform similar work. You can alternatively substitute the later Getrag 260/6 for the 265 but it's scarce in many markets. The 260/6 was offered in many early 90s BMWs. You'll also need other parts: driveshaft, support subframe, and shifter assembly at a minimum to make it work. Google is your friend, lots of pages devoted to all that.

    If I recall correctly, 1st gear is machined into the idler shaft forging. That idler shaft has gotten to be very difficult to find. BMW has recently stopped manufacturing parts for many of their older cars. To make things worse, Getrag was recently purchased by Magna (Steyr), I'd presume like most corporate mergers it'll focus on profits instead of customer service.
    Save the manuals!
    '08 128i 6MT, '86 635CSi 5MT (B32, Motronic 1.3, WBO2, G265, 18# FW, 3.46 torsen)
    Past projects:
    '96 318iS, sold 4/23 '90 535iM, RIP 1/23 '90 535iA RIP 6/22 '91 318i, sold 7/19 '97 M3 sedan, sold 11/18 '85 735i, RIP 2/18 '92 325iC, sold 7/16 '91 318iS, sold 6/16 '84 745i, sold 10/14 '82 633CSi, traded 9/12 '90 325i, RIP '87 325 sold '89 525i, traded '87 325iS, RIP

  6. #6
    Join Date
    May 2009
    Location
    ACT, Australia
    Posts
    47
    My Cars
    1977 E21, 1977 E24
    I have been offered a 260/5, but speedo drives and things like that appear to be different - All solvable issues of course, but i'd like to stick with the 265 if possible as it's a beast of a transmission.

    Worst case, due to the parts shortages, i'll look into having a batch of first gears custom made. Not cheap by any stretch of the imagination, but i'm sure i'm not the only person requiring gears for one.

  7. #7
    Join Date
    Feb 2009
    Location
    Pittsburgh, PA
    Posts
    1,718
    My Cars
    '86 635CSi, '08 128i
    Alternatively, talk to a machine shop. They might be able to build up the forging with welded material, then machine them back into shape. I've seen that done with spur-cut motorcycle 'boxes. Given the hypoid gear it's unlikely, but in this age of CNC & 3-axis milling machines, perhaps it's doable.

    Methinks the synchros are also a high-wear item, especially 2nd. Getrag builds a lot of other 'boxes, perhaps a cross-ref part from a larger 'box could work? MM has a lot of details on their site about upgraded synchos among the other stuff they rebuild. I'd definitely start with them.
    Save the manuals!
    '08 128i 6MT, '86 635CSi 5MT (B32, Motronic 1.3, WBO2, G265, 18# FW, 3.46 torsen)
    Past projects:
    '96 318iS, sold 4/23 '90 535iM, RIP 1/23 '90 535iA RIP 6/22 '91 318i, sold 7/19 '97 M3 sedan, sold 11/18 '85 735i, RIP 2/18 '92 325iC, sold 7/16 '91 318iS, sold 6/16 '84 745i, sold 10/14 '82 633CSi, traded 9/12 '90 325i, RIP '87 325 sold '89 525i, traded '87 325iS, RIP

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