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Old 07-20-2006, 01:06   #1 (permalink)
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change of diff ratio, wat speedo cog

wat speedo cog will i need in my toploader with a 3.45 rear end. atm its a 2.92 and has purple 17 toother in it, and speedo reads perfect. running 14inch 12 slotters, will be running 17s soon, i remember reading somewhere that wheel size made a difference??
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Old 07-20-2006, 07:22   #2 (permalink)
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Re: change of diff ratio, wat speedo cog

G'day,
have answered this a few times....
What you need to do is pull the speedo unit from the box, and ascertain the colour of the drive gear IN the box (as opposed to the driven gear on the speedo cable/sender)

The roll into a ford dealership with the Drive gear colour, box type, Diff ratio rim size and tyre profiles.

The have the table for selecting the right driven gear, and its pretty accurate.

Cheers
Jas
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Old 07-22-2006, 01:00   #3 (permalink)
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Re: change of diff ratio, wat speedo cog

With your electronic XD speedo, there is a calibration screw in the back. Buying a new sender cog will always be a little out, plus the cogs for a toploader with 3.5's cost about $45 these days! I think it's a white one?

I'm on the road at present, but I can post a pic next week. It's a real simple job. You'll have about +/- 40km/h of adjustment & saves you having to change cogs again with the new 17's.
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Old 07-22-2006, 09:14   #4 (permalink)
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Re: change of diff ratio, wat speedo cog

$45!!!!!!!!!!!!!!!!!!!!!!!! you got ripped!

on thursday i purchased a new driven gear for my dads XFN with 351 clevo and C4. $4.82 with clip!

If you paid for install then the price is probably right, but its a job any fool can do


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Old 07-23-2006, 02:17   #5 (permalink)
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Re: change of diff ratio, wat speedo cog

Quote:
Originally Posted by jas24zzk
$45!!!!!!!!!!!!!!!!!!!!!!!! you got ripped!

on thursday i purchased a new driven gear for my dads XFN with 351 clevo and C4. $4.82 with clip!

If you paid for install then the price is probably right, but its a job any fool can do


Cheers
Jas
Really? Well seeing that you know so much, ask your local supplier what he can do a "white" TOPLOADER cog for. Not a C4, FMX or Singlerail.

I paid someone $100 to fit it. Took them an hour so I figured that was worth it
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Old 07-23-2006, 05:45   #6 (permalink)
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Re: change of diff ratio, wat speedo cog

Hey bud,
not trying to short change your knowledge...but

$100 for the job, if you have no mechanical skill is probably reasonable, given my workshop rat is $65 an hour....by the time you jack it up etc.

My point was more directed on what the parts are worth. If you can be bothered, then you can save yourself a fortune (i say fortune by factoring in speeding fines from the stupid camera's)


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Old 07-23-2006, 06:02   #7 (permalink)
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Re: change of diff ratio, wat speedo cog

No worries jas, I was actually being sarcastic....my bad! As you know, it's only a 2 min job......lost track of how may gearbox changes I've done.

But I totally agree, $45 for a stooopid plastic cog is a major ripoff. Hence, why I tell people to use their electronic speedo calibration screw on late model Falcons. Toploader cogs to suit low diff gears are way more expensive that those to suit a standard set of 2.7's etc. I'm beat as to why - someone obviously sees rare toploader parts as a way to cash in. C4 ones chew out the toploader drive spline on the output shaft....prick of a job changing that one!

Even worse is the Ford retail price for the toploader reverse light shifter switch which would cost $1.50 at Dick Smiths......they charge about $65.

Clutch fork dust boot $60+. Output shaft speedo drive plastic cog $60+

Cheers,
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Old 07-24-2006, 05:38   #8 (permalink)
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Re: change of diff ratio, wat speedo cog

Interesting on what you say about the C4 cogs chewing out the drive gear.
I was recently reading an article in Mustang monthly on this topic.. They actually spoke about several different driven gears. I will dig it out for ya.

Cheers
Jas
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Old 08-02-2006, 03:22   #9 (permalink)
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Re: change of diff ratio, wat speedo cog

C4, single rail, Aus T5 all use the same speedo gears. Toploader are different, and Tremec are different again. Ben.
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