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Thread: Race and rally gearboxes 901/52 etc

  1. 02-19-2020, 11:13 AM #1
    Soterik
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    Race and rally gearboxes 901/52 etc

    Edited, sorry.
    Last edited by Soterik; 02-03-2021 at 10:07 PM.
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  2. 02-19-2020, 04:28 PM #2
    davep
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    Here is one example of a special gearbox with an otherwise normal serial #; there are several others.
    http://www.early911sregistry.org/for...-ex-B-Jennings
    Name: 901-52 104178.jpg Views: 733 Size: 113.7 KB
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  3. 02-19-2020, 04:33 PM #3
    davep
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    examples of 901/5x gearboxes in normal gearbox serial series. These are from 1967, so before the reserved series serials for the 5x boxes
    901/53 103753
    901/52 104178
    901/54 130972
    901/54 130973

    The 911 9 20xxx series appears to follow the above units in 1967; perhaps the Factory wanted to reduce confusion. I have:
    20002 airfield
    20006 airfield
    20008
    Last edited by davep; 02-19-2020 at 05:08 PM.
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  4. 02-19-2020, 05:24 PM #4
    HughH
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    Eric
    I think that the "special" numbers for these started in 1968 therefore almost by definition any earlier ones would be "regular" numbers.
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  5. 02-19-2020, 08:06 PM #5
    ajwans
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    20008 is 901/52 also.
    As is 20004, although the kardex shows 920004 for this one but that's absolutely consistent with how the stamping goes for these boxes.

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  6. 02-20-2020, 05:21 AM #6
    davep
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    Data provided by Hugh Hodges was quite revealing. One piece was gearbox 40001 a type 901/54. This suggests that there was in fact a family of gearbox serial # for 901/5x:
    911 9 901/51 100xx
    911 9 901/52 200xx
    911 9 901/53 300xx
    911 9 901/54 400xx

    So now the search begins for more of these special gearboxes. The VIN data suggests that 1967 911's with VIN's above 307600 will likely use these new serial ranges.
    Now get out there and put your car on a lift, and get photos of your transmission #'s!
    We need the VIN, type & serial #, plus if it is an aluminium case, get the casting date from the diff cover side of the main case.
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  7. 02-20-2020, 05:26 AM #7
    sithot
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    https://www.gboxweb.com/901specs.html
    901 5-SPEED TRANSAXLE SPECIFICATIONS


    901/00
    911 1964-65
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios:
    1st gear: 2.833 (AA)
    2nd gear: 1.778 (GA)
    3rd gear: 1.217 (O)
    4th gear: 0.962 (U)
    5th gear: 0.821 (Y)
    Ring and pinion: 4.43 (7:31)




    901/02
    911 1966-67
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios:
    1st gear: 3.091 (A)
    2nd gear: 1.889 (F)
    3rd gear: 1.318 (M)
    4th gear: 1.040 (S)
    5th gear: 0.793 (Z)
    Ring and pinion: 4.43 (7:31)




    901/03
    911 1967-68
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios:
    1st gear: 3.091 (A)
    2nd gear: 1.889 (F)
    3rd gear: 1.318 (M)
    4th gear: 1.040 (S)
    5th gear: 0.793 (Z)
    Ring and pinion: 4.43 (7:31)




    901/07
    911 1966-67, 911L 1968
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: (911 special-order, std 911L)
    1st gear: 3.091 (A)
    2nd gear: 1.889 (F)
    3rd gear: 1.318 (M)
    4th gear: 1.040 (S)
    5th gear: 0.857 (X)
    Ring and pinion: 4.43 (7:31)




    901/13
    911 1968-69
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios:
    1st gear: 3.091 (A)
    2nd gear: 1.889 (F)
    3rd gear: 1.318 (M)
    4th gear: 1.040 (S)
    5th gear: 0.793 (Z)
    Ring and pinion: 4.43 (7:31)




    901/50
    911 1967
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: (special-order)
    1st gear: 2.643 (B)
    2nd gear: 1.778 (GA)
    3rd gear: 1.318 (M)
    4th gear: 1.000 (T)
    5th gear: 0.821 (Y)
    Ring and pinion: 4.43 (7:31)




    901/51
    911 1967
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: ('hillclimb' w/904 mainshaft)
    1st gear: 2.833 (AA)
    2nd gear: 2.000 (E)
    3rd gear: 1.550 (I)
    4th gear: 1.318 (M)
    5th gear: 1.217 (O)
    Ring and pinion: 4.43 (7:31) or 5.33 (6:32)




    901/52
    911 1967
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: ('airfield' w/904 mainshaft)
    1st gear: 2.833 (AA)
    2nd gear: 1.889 (F)
    3rd gear: 1.476 (J)
    4th gear: 1.217 (O)
    5th gear: 1.040 (S)
    Ring and pinion: 4.43 (7:31)




    901/53
    911 (911R) 1967
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: ('fast track' w/904 mainshaft)
    1st gear: 2.400 (C)
    2nd gear: 1.600 (HA)
    4th gear: 1.217 (O)
    4th gear: 1.000 (T)
    5th gear: 0.821 (Y)
    Ring and pinion: 4.43 (7:31)




    901/54
    911 1967
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: ('nurburgring' w/904 mainshaft)
    1st gear: 2.643 (B)
    2nd gear: 1.600 (HA)
    4th gear: 1.318 (M)
    4th gear: 1.080 (R)
    5th gear: 0.926 (V)
    Ring and pinion: 4.43 (7:31)




    901/75
    911 1968
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: (special-order)
    1st gear: 2.643 (B)
    2nd gear: 1.778 (GA)
    3rd gear: 1.318 (M)
    4th gear: 1.000 (T)
    5th gear: 0.821 (Y)
    Ring and pinion: 4.43 (7:31)




    901/76
    911 1968
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: ('hillclimb' w/904 mainshaft)
    1st gear: 2.833 (AA)
    2nd gear: 2.000 (E)
    3rd gear: 1.550 (I)
    4th gear: 1.318 (M)
    5th gear: 1.217 (O)
    Ring and pinion: 4.43 (7:31) or 5.33 (6:32)




    901/77
    911 1968
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: ('airfield' w/904 mainshaft)
    1st gear: 2.833 (AA)
    2nd gear: 1.889 (F)
    3rd gear: 1.476 (J)
    4th gear: 1.217 (O)
    5th gear: 1.040 (S)
    Ring and pinion: 4.43 (7:31)




    901/78
    911 1968
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: ('fast track' w/904 mainshaft)
    1st gear: 2.400 (C)
    2nd gear: 1.600 (HA)
    4th gear: 1.217 (O)
    4th gear: 1.000 (T)
    5th gear: 0.821 (Y)
    Ring and pinion: 4.43 (7:31)




    901/79
    911 1968
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: ('nurburgring' w/904 mainshaft)
    1st gear: 2.643 (B)
    2nd gear: 1.600 (HA)
    4th gear: 1.318 (M)
    4th gear: 1.080 (R)
    5th gear: 0.926 (V)
    Ring and pinion: 4.43 (7:31)




    901/80
    911 1969
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: (special-order w/904 mainshaft)
    1st gear: 2.643 (B)
    2nd gear: 1.778 (GA)
    3rd gear: 1.318 (M)
    4th gear: 1.000 (T)
    5th gear: 0.821 (Y)
    Ring and pinion: 4.43 (7:31)




    901/81
    911 1969
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: ('hillclimb' w/904 mainshaft)
    1st gear: 2.833 (AA)
    2nd gear: 2.000 (E)
    3rd gear: 1.550 (I)
    4th gear: 1.318 (M)
    5th gear: 1.217 (O)
    Ring and pinion: 4.43 (7:31) or 5.33 (6:32)




    901/82
    911 1969
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: ('airfield' w/904 mainshaft)
    1st gear: 2.833 (AA)
    2nd gear: 1.889 (F)
    3rd gear: 1.476 (J)
    4th gear: 1.217 (O)
    5th gear: 1.040 (S)
    Ring and pinion: 4.43 (7:31)




    901/83
    911 1969
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: ('fast track' w/904 mainshaft)
    1st gear: 2.400 (C)
    2nd gear: 1.600 (HA)
    4th gear: 1.217 (O)
    4th gear: 1.000 (T)
    5th gear: 0.821 (Y)
    Ring and pinion: 4.43 (7:31)




    901/84
    911 1969
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: ('nurburgring' w/904 mainshaft)
    1st gear: 2.643 (B)
    2nd gear: 1.600 (HA)
    4th gear: 1.318 (M)
    4th gear: 1.080 (R)
    5th gear: 0.926 (V)
    Ring and pinion: 4.43 (7:31)




    902/1
    912, some 911 1965-67
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios:
    1st gear: 3.091 (A)
    2nd gear: 1.889 (F)
    3rd gear: 1.318 (M)
    4th gear: 1.040 (S)
    5th gear: 0.857 (X)
    Ring and pinion: 4.43 (7:31)




    902/02
    912 1968
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios:
    1st gear: 3.091 (A)
    2nd gear: 1.889 (F)
    3rd gear: 1.318 (M)
    4th gear: 1.040 (S)
    5th gear: 0.857 (X)
    Ring and pinion: 4.43 (7:31)




    902/05, 902/06, 902/16
    912 1969
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios:
    1st gear: 3.091 (A)
    2nd gear: 1.778 (GA)
    3rd gear: 1.217 (O)
    4th gear: 0.962 (U)
    5th gear: 0.793 (Z)
    Ring and pinion: 4.83 (6:29)




    902/50
    912 1968
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: ('hillclimb')
    1st gear: 3.091 (A)
    2nd gear: 2.000 (E)
    3rd gear: 1.550 (I)
    4th gear: 1.217 (O)
    5th gear: 0.962 (U)
    Ring and pinion: 4.43 (7:31)




    902/60
    912 1969
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    Plate-type limited-slip differential available
    Rod shift
    Single-plate clutch
    Gear ratios: ('hillclimb')
    1st gear: 3.091 (A)
    2nd gear: 2.000 (E)
    3rd gear: 1.550 (I)
    4th gear: 1.217 (O)
    5th gear: 0.962 (U)
    Ring and pinion: 4.43 (7:31)
    Last edited by sithot; 02-20-2020 at 07:18 PM.
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  8. 02-20-2020, 08:58 AM #8
    Cliff
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    Great info.
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    ”What would PORSCHE do”

    67 911 de Luxe, 356 B silver metallic / brown interior, ( buck skin really ) 67 PORSCHE [ built ] 912, Crystal blue, black interior, 72 T, Silver metallic/black interior, appearance group,factory AC.
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  9. 02-20-2020, 09:24 AM #9
    Jon B
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    Quote Originally Posted by sithot View Post
    5-speed synchronized transaxle
    Manufactured by Porsche (ZF)
    The only ZF involvement these transmissions was the supply of optional limited-slip differentials.

    Jon B.
    Vista, CA
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  10. 02-20-2020, 12:40 PM #10
    Xavier PJB
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    What about 901/05 gearbox type ? I have read many stories about that type.
    From my 911L COA : 32825xx - 901/54
    O-G 26 - Early911S 2407
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