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Which cog to use for speedo after fitting 3.45 diff? 

 

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 Post subject: Which cog to use for speedo after fitting 3.45 diff?
Posted: Wed Jun 14, 2006 7:50 am 
Parts Gopher
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Hi guys as the title suggests, which cog do i use to correct my speedo reading?
I now have a 3.45 LSD fitted with 17" rims. Im pretty sure i have to use the black 23 tooth one but am unsure..... i rang ford and asked them but they werent convincing as they said the 22 tooth is for 15's and the 23 tooth is for 16's. So which will be best for 17's???
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Posted: Wed Jun 14, 2006 8:59 am 
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black cog dude!

 

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Posted: Wed Jun 14, 2006 9:27 am 
Parts Gopher
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thanks for the info!
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Posted: Wed Jun 14, 2006 12:03 pm 
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im 99% sure its the grey tooth for 3.45 and 17inch wheels. thats what ford gave me.

 

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Posted: Wed Jun 14, 2006 12:13 pm 
Parts Gopher
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so the grey one is the 22 tooth cog???

how accurate is your speedo now with the grey one?

anyone else know which is best?
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Posted: Wed Jun 14, 2006 12:17 pm 
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I think you are supposed to use the grey one, apparently 225/50R16s are a slightly larger diameter then 205/65R15s and 234/45R17s, which are almost identical.
Having said that, I've got a black one with my 17's and 3.45 diff, and speedo is fairly accurate, AFAIK.
Have a play with the 'Speedo Calculator' in the Technical Documents section.

 

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Posted: Wed Jun 14, 2006 2:23 pm 
Getting Side Ways
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ive got a black one too
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Posted: Wed Jun 14, 2006 2:39 pm 
Parts Gopher
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i didnt know about the calculator - thanks!!!

however one thing is does anyone know what cog was used for my standard 3.08 diff?
and are 15s standard for a 96 EL Futura as i thought 16s were!!
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Posted: Wed Jun 14, 2006 4:17 pm 
Getting Side Ways
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i pulled a black cog outta my gearbox when the 3.08 was in there. i had 17's on my car too

 

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Posted: Mon Jun 19, 2006 9:58 am 
Parts Gopher
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well new gear is in.... i went with the black one, speedo is about half a k out in my favour eg 100.5 on speedo actual speed is 100

thanks for everyones help.

just for future reference i pulled a brown 20 tooth gear out - it was matched with 3.08 originally
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