w58 speedo variations with 4.11 diff

[pete05]

Hey all i just put a w58 into my mx73 which runs a standard diff of 4.11, the speedo drive is 32, does anybody have any idea how much this would put my speedo out by

[CrUZida]

Is the other gear 10 or 11 teeth ?

[wilbo666]

Is the other gear 10 or 11 teeth ?

If you take the 32 tooth nylon gear out it should have it stamped on it... 10/32 or 11/32...



Cheers
Wilbo

[pete05]

I am fairly sure its 11 from when i had it out last time however it will be out again tomorrow as i have no drive to the speedo at the moment.


Cheers pete

[pete05]

Ok i pulled the drive out and its a 10/32, any ideas?

[CrUZida]

I will be able to tell you tomorrow morning.
I don't have the program I use to calc speedo errors with me atm.

[jonra23]

Do you know the ratio of the speedo gears in the box you pulled out?, from there you cancalculate the difference in the two ratios and then th error.

regards
jon

[pete05]

No, it was the standard auto, not really sure on those ratios, if you could find out for me peewee that would be great.

[wilbo666]

3.42 - 11 - 30
3.58 - 11 - 32
3.73 - 11 - 33
3.91 - 11 - 35
3.91 - 10 - 31
4.10 - 10 - 33
4.30 - 10 - 35
4.30 - 9 - 31

http://www.toymods.net/forums/showpo...5&postcount=20

Looks like you are after 10/33....but with the 10/32 your speedo will read about 3.03% low...(when doing 97kph speedo will read 100kph....if i didn't get it arse about! )

Cheers
Wilbo

[pete05]

ok thats excellent stuff thanks, so here is my next major problem!!!!!! I cant get the speedo drive that slides into the gearbox to actually spin when i turn the tail shaft, i can see the gear inside the box turn ok but the little output drive doesnt turn, are these gears all different diam?

[wilbo666]

http://www.toymods.net/forums/showth...ht=speedo+gear

I've seen at least two different diameters!

Cheers
Wilbo

[pete05]

man you have all the info this is great, mine appears to be 29mm ish and im told by the previous owner that its a w58 so that may explain part of the problem

[pete05]

Well after going to every local wrecker and parts pick place i still dont know what drive it is, evrything i have looked at has a 29mm dia gear on it, i have yet to find a bigger one.
i pulled the top off the box and it definately doesnt mesh with the gear. when we were talking about the gear ratio, i.e 10/32 is the 10 the number of teeth that gear inside the box has were it contacts with the speedo drive? mine looks like it has 6.

[CrUZida]

It may look like it has 6, but it will have 10 (or 11)
The number is stamped on the side of it.

[pete05]

I just finished pulling the rear housing off the gear box and found the drive inside the gearbox to be a 10x 34-36. I wasnt actually that hard to do in the end, now i need to work out the speedo error, If im running the standard 4.11 diff in the cressida should only put my speedo out a bit with the 10-32 gear as wilbo said it should read, low 3.03% so if im doing 100 on the speedo it should only be 97 in theory?
I also have a ma61 lsd diff to change over to which i think is 3.9, so should that read about the same amount the other way as in 100 on the speedo is actually around 103kph?


Pete