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Location:
Brisbane
Registered:
May 2002
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W5X Spedo Drive Gear
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Wed, 15 October 2003 12:35
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Hey guys, the W55 I've sourced had a 3.909 diff behind it, does that mean I HAVE to change the gear in the actual gear box or is the difference in the spedo cable that I have?
Also does it make any difference that my spedo cable has a 90 degree attachment where it screws into the gearbox (does this act like a ratio reducer / increaser?)
If I have to change the spedo drive in the box is it just a matter of removing the rear housing, or is it more complicated than that?
Cheers
Wilbo
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Location:
Brisbane
Registered:
May 2002
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Re: W5X Spedo Drive Gear
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Wed, 15 October 2003 12:57
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Yes you have to change the nylon gears inside the box. You just need to remove the extension housing to get at them, not hard but a PITA when it's in the car.
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Location:
Brisbane
Registered:
May 2002
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Re: W5X Spedo Drive Gear
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Wed, 15 October 2003 13:33
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Gears? I though it was just one, see I've learned something already! 
Also I thought that some spedo cables had different numbers of teeth on them? Toyota the place to go or will they charge a testicle (i.e. anywhere better to go)?
So that 90 degree thing is just that, no gear reduction?
Cheers
Wilbo
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Location:
Perth
Registered:
September 2002
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Re: W5X Spedo Drive Gear
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Wed, 15 October 2003 13:47
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only 1 gear, little plastic white thingy
and that 90 degree elbow just has cable in it
good luck finding the correct gear to suit you diff
the gear for w55/7/8/9 only comes in 32 and 33
i need a 36 to suit the 4.1:1 diff
looks like it will be custom
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Location:
Lost in the K hole
Registered:
May 2002
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Re: W5X Spedo Drive Gear
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Wed, 15 October 2003 13:48
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ahhh crap - i hadnt considered this... bloody mkiv gear boxes... norbie, did you change your box's gears to suit the supra speedo? if so, did you just swap over the ones from the original w58?
otherwise, whats the final drive ratio in the mkiv NA manual? how fucked is my speedo going to be 
cheers
ed
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Location:
Perth
Registered:
July 2003
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Re: W5X Spedo Drive Gear
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Wed, 15 October 2003 13:58
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Fellas,
try part # 33403-19235. Supposedly it is a 34 tooth & accoring to our local Toy dealers they can order it for $57.20.
I chased this up for mine (speedo reads 10% high & has a 32 tooth in it now), but never got around to buying one.
Once I put the 3.73 diff back in I will probably need a 33 tooth.
Peter
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Location:
Perth
Registered:
September 2002
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Re: W5X Spedo Drive Gear
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Wed, 15 October 2003 14:13
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34 hey? that still isnt quite enough
i'm running a 33, and its 9% high, so i need a 36 toother (33 x 1.09 = 35.97 - close enough)
any one have any idea how much it would cost to get a little plastic gear with 36 teeth on it made up?
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Location:
Brisbane
Registered:
May 2002
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Re: W5X Spedo Drive Gear
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Wed, 15 October 2003 15:08
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$57 Fuck me ay....for a little bit of plastic 
Anyone want to swap one from a 3.727 diff for a 3.909?
So the number of teeth on the actual speedo cable doesn't vary?
Cheers
Wilbo
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: W5X Spedo Drive Gear
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Wed, 15 October 2003 16:13
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Peter,
Are you swapping a 3.73 diff back in? Whats wrong with the 3.9?
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Location:
Brisbane
Registered:
May 2002
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Re: W5X Spedo Drive Gear
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Wed, 15 October 2003 23:50
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What's all this about their being only one gear? The gear has to mesh with something, ie another gear, otherwise it doesn't do anything! It's the ratio of teeth between those two gears that's important here. Both of them can be changed to get the ratio you're after.
Ed: the NA MkIV 5-speed has a 4.0:1 diff ratio. I didn't swap the speedo gears in mine, but my Supra has a 4.1:1 diff ratio so it turns out the speedo is pretty close. I'm about to change my diff ratio to 3.5:1 though, so I'm going to have to do something about the speedo then!
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Location:
Perth
Registered:
September 2002
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Re: W5X Spedo Drive Gear
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Thu, 16 October 2003 00:20
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| wilbo666 wrote on Wed, 15 October 2003 23:08 |
So the number of teeth on the actual speedo cable doesn't vary?
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there arent any
its a key-way drive
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Location:
Lost in the K hole
Registered:
May 2002
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Re: W5X Spedo Drive Gear
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Thu, 16 October 2003 00:57
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| wilbo666 wrote on Thu, 16 October 2003 01:08 |
Anyone want to swap one from a 3.727 diff for a 3.909?
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im now in need of a 3.909 if you feel like ofloading it once youve got the one you need (although it is close to 4.0, so if i didnt change it, the speedo wouldnt be too bad...)
sorry, cant help you with the 3.727 though...
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Location:
Perth
Registered:
September 2002
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Re: W5X Spedo Drive Gear
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Thu, 16 October 2003 01:04
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correct me if i'm wrong, but wilbo's will be an E series diff? (mx62, solid axle etc)
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Location:
Perth
Registered:
July 2003
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Re: W5X Spedo Drive Gear
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Thu, 16 October 2003 05:02
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JCMF - nothing wrong with the 3.9. I just think that once the 1JZ goes in the 3.73 will result in less wheelspin (ie only 1st & 2nd  ).
Norbie - you are correct about there being two gears. But the plastic one (driven gear, 32 - 34 tooth) is a piece of cake to change (can be done from under the car) with the box in the car.
The other one (11 or 12 tooth if memory serves me right) is a PITA. So if I can get the ratio close enough with a new driven gear I will go with it.
Peter
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Location:
Brisbane
Registered:
May 2002
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Re: W5X Spedo Drive Gear
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Thu, 16 October 2003 05:41
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It's true that changing the gear on the output shaft is a PITA, but sometimes you have no choice, ie when you make a major change in your car's diff ratio. Note that it can still be done with the box in the car, but it's a bit messy.
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: W5X Spedo Drive Gear
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Thu, 16 October 2003 05:44
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82MKII,
Got any plans for the 3.9?
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Location:
sydney
Registered:
March 2003
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Re: W5X Spedo Drive Gear
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Thu, 16 October 2003 07:05
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isnt the gear on the output shaft all the same no mater what diff u have
i know on datsun boxes its all the same
and u just change the speedo plastic gear
i have never heard of changing the output shaft gear to suit a different ratio on a diff
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Location:
Perth
Registered:
September 2002
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Re: W5X Spedo Drive Gear
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Thu, 16 October 2003 07:11
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while you could prolly get aaway with not changing the gear on the output shaft, to change the speedo gear from say 29 to 36 teeth, it would no longer match up well with the output shaft gear
hence slowly chew the plastic gear out
how long this will take is anyones guess
and fwiw, w50/40 gboxs are pressed onto the output shaft and not easily removeable at all
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Location:
sydney
Registered:
March 2003
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Re: W5X Spedo Drive Gear
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Thu, 16 October 2003 07:58
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well on datsun gboxes the plastic gear is offset in the speedo drive
so when u have one with bigger diameter the offset is more so it wont jam or fuk the plastic gears
im pretty sure toyota wouldnt change the gear on ht eoutput shaft
all they would do is change the speedo drive that slides into the back
u can see this by gettin 2 different sized speedo drives and checking if the offset is different
all u need to do is unbolt the speedo drive
and change it with a similar one but with different amount of teeth
just goto wrekers and try afew
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Location:
Perth
Registered:
September 2002
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Re: W5X Spedo Drive Gear
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Thu, 16 October 2003 08:13
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there are at least 3 different sizes of speedo gear, and they are not compatible with each other
and in each size, only a few different number of tech as available.
so matching gear to a diff that was never a combo from factory can be a problem
i had my w40 perfect, but it was just luck that it came with a speedo gear for the original diff/tyre combination that was obviouslythe same ratio as my diff/tyre combination
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Location:
Brisbane
Registered:
May 2002
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Location:
Perth
Registered:
September 2002
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Re: W5X Spedo Drive Gear
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Thu, 16 October 2003 13:15
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yeah wilbo, its mainly configured for the diff
although it is actually configured to the amount of road travelled per 32 turns of driveshaft (or 33 or 34 or whateva speedo gear you have)
so if you put bigger tyres on (diameter, not width), you will take less rotations of driveshaft for the same amount of road travelled, and hence you speedo will read lower than before
its the same with the diff, smaller ratio of teeth will make the driveshaft turn more for the same amount of road travelled, hence again the speedo will read lower
if your speedo is only just out, and you are up for new tyres, and you cant get the right speedo gear, it may be worth going up or down 5% profile
tho godknows what affect on the ride/handlin this will have!!!
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Location:
Brisbane
Registered:
May 2002
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Re: W5X Spedo Drive Gear
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Thu, 16 October 2003 14:03
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Do sa63's come with 185 / 70 / r14's standard?
If so the acutal diff ratio if I put it in my car with 185 / 75 / r14's is 3.79 apparently using this... if thats the case I'll be stoked!
Cheers
Wilbo
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