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Location:
Perth
Registered:
July 2003
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W57 Speedo Driven Gear Change
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Thu, 10 July 2003 15:30
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Hey all,
I have 82 MkII Euro Spec Supra with a W57 in it. Due to a combination of non-stock tyres & diff ratio, my speedo & odo now reads about 10% high (yes the speedo is correctly calibrated).
Now according to my EPC I have a 11 tooth Speedo Drive Gear (33481-22020) and a 32 tooth driven gear in the tranny (33403-19255, description says 'N=32, MARK 32:11'). I have pulled the driven gear & yes it has 32 teeth.
According to Toyota I can get a 35 tooth gear (33403-19235), but the description says 'N=35, MARK 35:10'. So does that mean this 35 tooth gear is designed to mesh with a 10 tooth driving gear & will NOT mesh properly with my current 11 tooth Speedo Drive Gear?.
I really don't want to have to drop the tranny just to fix this.
Any suggestions?
Thanks
Peter
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Location:
Brisbane
Registered:
May 2002
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Re: W57 Speedo Driven Gear Change
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Thu, 10 July 2003 23:52
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Apparently it's possible to swap the speedo gear without dropping the transmission, but it's still a crap job! Sorry I can't answer your question though.
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Location:
Perth
Registered:
July 2003
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Re: W57 Speedo Driven Gear Change
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Fri, 11 July 2003 10:17
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Thanks Norbie. Yeah the driven gear is easy to get out (pulled it out to count the teeth) - don't see how it would be possible to change the other one without dropping the tranny.
There must be someone out there who knows if what I would like to do will work? Anyone work for Toyota? If not I guess I'll have to take a punt & blow $60 on a 35 tooth gear which may end up as a heap of plastic shavings in my tranny!
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Location:
Brisbane
Registered:
May 2002
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Re: W57 Speedo Driven Gear Change
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Fri, 11 July 2003 14:22
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You can do it by draining your transmission and removing the extension housing (where the speedo gear is located). Like I said it's a crap job but it can be done. 
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Location:
Melbourne
Registered:
September 2002
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Re: W57 Speedo Driven Gear Change
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Sat, 12 July 2003 11:46
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I did do this with a T50. I will simply agree that it is a bugger of a job whether you leave it in the car or pull it out (I ended up doing both - don't ask).
If you don't swap the worm gear (the 11 or 10 tooth gear) then you speedo will read incorrectly AND you run the risk of wearing out the driven gear. That risk in reality is not high unless you leave for a long time. I safely ran mine for 6 months before correcting the gears.
Denis
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Location:
Perth
Registered:
July 2003
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Re: W57 Speedo Driven Gear Change
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Sun, 13 July 2003 13:02
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Thanks for the info Denis.
How worn was your driven gear after 6 months of 'incorrect' use (before you changed the driving gear)?
I may just do the same (whack it in and see how it goes).
Sounds like changing the gear in the tranny is not going to be fun. I do have a bit of input shaft noise in the W57 - maybe it is time to get it ripped out & reconditioned & do the gear at the same time.
Thanks again
Peter
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