Is anyone using this combo and has replaced the speedo drive gears to make the speedo read correctly? Any part numbers or info you could provide would be appreciated. Since the 3.90 is mainly a Cressida gear and very few of those came with a W58, Im wondering how hard this is going to be to get working properly.
SupraWes
Joined
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3,522 Posts
R154 uses 32/10 gears for the early year mk3 turbos (88-late 89) and 33/11 for the later years, since they switched to a different diff (from 3:91 to 3:727)
just use carlos' formulas, and make sure it is a xx/10 gear, for my car (3.727 rear) it works out to a 30/10 working best, but i am on a 255/40R17 rear
i made a little calc program for this, you can access it at:
http://www.telusplanet.net/public/rasp08/speedogearcalc.xls
ok more info:
turns out, the difference between a 33/11 and 33/10 driven gear is really, really minor (as in, you can use a driven gear meant for a 11 tooth drive gear with a 10 tooth, and vise versa)
so heres some part numbers, if tooth numbers are double listed it means that there are two different types for different transmissions, but all the W and R series gears are interchangeable so theres no reason for the different numbers - I dont know the drive gear numbers for these pns though, just the driven gear numbers
33403-29105 30 teeth
33403-29115 33 teeth
33403-29125 32 teeth
33403-29135 33 teeth
33403-29145 31 teeth
33403-39075 34 teeth
33403-19235 35 teeth
33403-19245 31 teeth
33403-19255 32 teeth
just use carlos' formulas, and make sure it is a xx/10 gear, for my car (3.727 rear) it works out to a 30/10 working best, but i am on a 255/40R17 rear
i made a little calc program for this, you can access it at:
http://www.telusplanet.net/public/rasp08/speedogearcalc.xls
ok more info:
turns out, the difference between a 33/11 and 33/10 driven gear is really, really minor (as in, you can use a driven gear meant for a 11 tooth drive gear with a 10 tooth, and vise versa)
so heres some part numbers, if tooth numbers are double listed it means that there are two different types for different transmissions, but all the W and R series gears are interchangeable so theres no reason for the different numbers - I dont know the drive gear numbers for these pns though, just the driven gear numbers
33403-29105 30 teeth
33403-29115 33 teeth
33403-29125 32 teeth
33403-29135 33 teeth
33403-29145 31 teeth
33403-39075 34 teeth
33403-19235 35 teeth
33403-19245 31 teeth
33403-19255 32 teeth
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