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Thread: Transmission input shaft

  1. #1
    Registered User hawkwind's Avatar
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    Transmission input shaft

    Many years ago when it was still my daily driver, my '57 began popping out of 4th gear. I tore the transmission down and determined that the problem was badly worn teeth on the input shaft. I have been using a wide ratio box from a sedan to keep the car on the road. Miraculously, I have managed to hang onto all of the important parts and finally have the time to make it right.
    I am planning to replace the input shaft 121 262 02 01 with a shaft from another spare wide ratio box 121 262 00 01. Does anybody know if things will interchange before I start tearing stuff apart? I will replace the sliding member as well since it doesn't look too good either.
    thanks,
    Dave
    Last edited by hawkwind; 03-18-2016 at 07:44 PM.
    Dave Fain

    1957 190SL (since 1974) still needs interior and detailing
    1967 Triumph GT6 (since 1978)
    2007 Audi Q7 4.2L
    1985 VW Cabriolet (future project)
    1941 Chrysler New Yorker
    1977 MGB

  2. #2
    Administrator wpuryear's Avatar
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    I guess you're looking at later era shafts because the numbers don't quite match up, regardless I thought this '63 info might be of use.

    Walt
    Attached Files Attached Files

  3. #3
    Registered User hawkwind's Avatar
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    Re: Transmission input shaft

    I am pretty sure mine is original to the car since the number on the transmission case is close to my VIN. Thanks for checking. I figured if anybody had the information it would be you. Guess I will count the teeth and compare them visibly and forge ahead.
    Dave
    Dave Fain

    1957 190SL (since 1974) still needs interior and detailing
    1967 Triumph GT6 (since 1978)
    2007 Audi Q7 4.2L
    1985 VW Cabriolet (future project)
    1941 Chrysler New Yorker
    1977 MGB

  4. #4
    Registered User hawkwind's Avatar
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    Re: Transmission input shaft

    So much for that bright idea. The teeth on the input shaft match up with the synchro and the sliding member, but the gear that meshes with the countershaft is different so the one digit difference in the part number is significant. It looks like I could swap the front gear on the countershaft to make it work, but it would change the "constant" ratio (see 26-5/3 in the 190 manual) from the input shaft to the countershaft from 1.58 (190SL) to 1.88 (wide ratio) which would cancel any advantage I would gain by using the 190SL gears and countershaft. So the short answer is that swapping a 190 sedan countershaft into a 190sl box won't work. I am better off leaving things as is unless I can find a new correct input shaft at a realistic price (unlikely).
    Dave
    Dave Fain

    1957 190SL (since 1974) still needs interior and detailing
    1967 Triumph GT6 (since 1978)
    2007 Audi Q7 4.2L
    1985 VW Cabriolet (future project)
    1941 Chrysler New Yorker
    1977 MGB

  5. #5
    Registered User hawkwind's Avatar
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    Re: Transmission input shaft

    Incidentally, the 180 manual 26-5/3 shows an early and late version of the 190SL transmission. I have a late version so about the only difference between the 190 sedan and 190sl is a slightly taller first gear. I wondered why the ratios I was calculating after counting teeth didn't match the advertised ratios. My car was built in November of 1957 so the change occurred before that.
    Dave
    Dave Fain

    1957 190SL (since 1974) still needs interior and detailing
    1967 Triumph GT6 (since 1978)
    2007 Audi Q7 4.2L
    1985 VW Cabriolet (future project)
    1941 Chrysler New Yorker
    1977 MGB

  6. #6
    Administrator wpuryear's Avatar
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    From the parts manuals:

    121 260 05 20 is the only number shown in the A, B, and C manuals.

    121 260 14 20 used from transmission 17055 to 24021 and was replaced by
    121 260 10 20

    121 260 12 20 used from transmission number 24022

    There were also changes in the counter shaft.

    Walt

  7. #7
    Registered User hawkwind's Avatar
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    Re: Transmission input shaft

    Given the fact that the car had a lot of other sketchy stuff done to it before I owned it, it is likely that the transmission was replaced at some point. The engine was not original either. The number on the transmission case 7502898 is remarkably close to my car's VIN so I assumed it was original to the car. It might have been a replacement box or it could have come from a ponton 220 which is the only other car that had those exact gear ratios. Can you tell where it came from by the number?
    Dave
    Dave Fain

    1957 190SL (since 1974) still needs interior and detailing
    1967 Triumph GT6 (since 1978)
    2007 Audi Q7 4.2L
    1985 VW Cabriolet (future project)
    1941 Chrysler New Yorker
    1977 MGB

  8. #8
    Registered User Simonrex's Avatar
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    Re: Transmission input shaft

    Iím about to mate the tranny to the engine, I am replacing the input shaft seal, but what do you use to seal up the housing? RTV?
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  9. #9
    Gerry Lazo 56 190SL owner walazos's Avatar
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    Re: Transmission input shaft

    There is a paper gasket behind the front plate. Here is a picture from one of our sponsors on their gasket set.
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    Gerry Lazo
    56 190SL (6500870)

  10. #10
    Registered User Simonrex's Avatar
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    Re: Transmission input shaft

    Hope my order didn’t go out....hope Jeff at SLS carries just the plate gasket. Thanks Gerry

  11. #11
    Registered User Simonrex's Avatar
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    Re: Transmission input shaft

    Quote Originally Posted by walazos View Post
    There is a paper gasket behind the front plate. Here is a picture from one of our sponsors on their gasket set.
    Which sponsor Gerry? Has anyone use sealant for a gasket? Jeff doesn’t carry the front plate gasket

  12. #12
    Administrator wpuryear's Avatar
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    Re: Transmission input shaft

    There is no gasket for the front cover, only the rear. Use a sealing compound on the front. On the rear, sealing compound on the case and grease on the cover.

    Walt

  13. #13
    Registered User Simonrex's Avatar
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    Re: Transmission input shaft

    Walt, do you recommend type or brand?

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