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Speedo Gear Change 

 

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 Post subject: Speedo Gear Change
Posted: Sat May 21, 2011 9:57 pm 
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Hi guys, ive just swapped over my speedo gear from my old gearbox into the new one but now my speedo will not work at all and it wont change gear, is there a specific way these gears need to be changed over or do i just keep playing with it until it works?

Cheers
Josh
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 Post subject: Re: Speedo Gear Change
Posted: Sun May 22, 2011 10:22 pm 
Getting Side Ways
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did you plug it back in and did you put the retaining clip back in the gear?

 

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 Post subject: Re: Speedo Gear Change
Posted: Sun May 22, 2011 11:02 pm 
Getting Side Ways
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Well i have 2 one from old box one from new, so just swapped whole sensor, but i pulled it back out today ( one from original box) to find half of it missing, so now i need a Green speedo gear.
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 Post subject: Re: Speedo Gear Change
Posted: Mon May 23, 2011 9:38 am 
Getting Side Ways
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what diff gears you running josh? i have a green gear in mine but i'm running 3.9 diff...

 

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custom airbox,custom intake
paccie comps,lukey 2.5 cat back,high flow cat
CMS stg2 head,CMS stg2.A. cam,CMS hybrid auto with mod shift,3.9 lsd
custom 3500rpm hi stall
ANZ mayhem 18's,custom interior,venom body kit,xr wing,jumbo 2' low springs
143rwkw and 407rwnm on CMS dyno

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 Post subject: Re: Speedo Gear Change
Posted: Mon May 23, 2011 9:55 am 
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Ride: ford falcon au3 xr8

Location: a shit suburb in sydney
NSW, Australia

the green 21 tooth gear is for 3.27 ratio..

brown 20 teeth ,3.08
grey 22 teeth 3.45
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 Post subject: Re: Speedo Gear Change
Posted: Mon May 23, 2011 9:15 pm 
Getting Side Ways
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Ok well i need a grey one as i have the 3.45 LSD in it, and ive got a pinky coloured one in it now but reads way to far out.
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 Post subject: Re: Speedo Gear Change
Posted: Mon May 23, 2011 9:19 pm 
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pink is 19 teeth for 2.92...lol
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 Post subject: Re: Speedo Gear Change
Posted: Mon May 23, 2011 9:21 pm 
Getting Side Ways
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Wow explains why my speedo is out no less then 15+ kays, looks like ill be finding that grey one asap.
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 Post subject: Re: Speedo Gear Change
Posted: Mon May 23, 2011 9:27 pm 
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green machine wrote:
what diff gears you running josh? i have a green gear in mine but i'm running 3.9 diff...

But yours is an XF sender.
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 Post subject: Re: Speedo Gear Change
Posted: Wed May 25, 2011 9:20 am 
Getting Side Ways
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thats right paul thats why my speedo is 100% correcto :) :)

beasty for 3.45 you need a 21 black gear not grey

 

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custom airbox,custom intake
paccie comps,lukey 2.5 cat back,high flow cat
CMS stg2 head,CMS stg2.A. cam,CMS hybrid auto with mod shift,3.9 lsd
custom 3500rpm hi stall
ANZ mayhem 18's,custom interior,venom body kit,xr wing,jumbo 2' low springs
143rwkw and 407rwnm on CMS dyno

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 Post subject: Re: Speedo Gear Change
Posted: Thu May 26, 2011 1:32 pm 
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green machine wrote:
thats right paul thats why my speedo is 100% correcto :) :)

beasty for 3.45 you need a 21 black gear not grey


black is 23 teeth, i use that one with a 3.45 since the ford speedos seem to be about 5% generous.

 

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 Post subject: Re: Speedo Gear Change
Posted: Thu May 26, 2011 9:11 pm 
Getting Side Ways
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Ok so i need a black gear then?
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 Post subject: Re: Speedo Gear Change
Posted: Thu May 26, 2011 11:57 pm 
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Ride: ford falcon au3 xr8

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NSW, Australia

the black gear is for 3.45 on cars with 50 series 16's.

im running the grey gear which is also for 3.45 on xr6 ef ect..

have a look at this tech doco it has a speedo calculator and what gear is for what ratio
documents.php?d=30
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 Post subject: Re: Speedo Gear Change
Posted: Fri May 27, 2011 12:06 am 
Getting Side Ways
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Location: Penrith
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Calculator says i need grey speedo gear will put it no more then 5kms over when i go back to 20 and puts me pritty spot on with the current 18's
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 Post subject: Re: Speedo Gear Change
Posted: Fri May 27, 2011 12:30 am 
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That calculator doesn't actually work properly. If you increase the gear teeth the speedo reading should go DOWN not up.

 

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ED XR6, LeMans Red, 5-Speed
AUII XR8, Silhouette, 5-Speed

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