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if I have 3:55 ratio diff...

If my diff ratio is 3:55, and my tire size is 205/60/15, and Im running a trimatic, what is my revs at 100km/h and what speedo gear will I require to set my speedo accurate? I can find all the info about 14inch and 13inch wheels but not 15's,
Thanks
Grant

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You need to know colour ie (number of tteeth) of drive gear in box then you can determin colour required of driven gear on cable, plenty of online calculators to help you. Your new tyre diameter is 627mm which is 16mm less than stock wheels&tyres at 643mm.

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Just noticed that it is VC not Hq-Wb, was available with 13,14 & 15 inch wheels anyway depending on model, still need to know gear drive colour to calculate . That figure of 643 may not be correct for original diameter but the 627 is for you new tyre size.

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I believe its a white gear

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HOLDEN DOCTOR

It'll rev a bit my HD with trimatic 3.36 with taller 225/60 15's sits on about 2950rpm at a 100kph, I'll guessing that your VC would be at least 3100rpm.

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HOLDEN DOCTOR

http://locost7.info/...
I was playing with that the other day

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Whats wrong with Melbourne drug addicts sleeping all over the footpath trying to scab money?

I have two tyre options for my HD, one of is a 185/80 r13 at 24.7 inches tall & behind my is sit's on just over 3000rpm at 100kph, 205/60 r15 has the same radius at 24.7 inches tall, with a trimatic & a 3.55 it'll be more like 3100rpm

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HOLDEN DOCTOR

is the gear scan program wrong?

AttachmentSize
Image icon gear355.PNG64.43 KB
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Whats wrong with Melbourne drug addicts sleeping all over the footpath trying to scab money?

Maybe it's the way I'm seeing the 2" tacho, I'm getting similar result.
http://www.centauria...

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HOLDEN DOCTOR

I was guessing around 3100rpm which is fine coz of my cam and 2200 stally my cams rev range is 2100-5700 rpm
Thanks for letting me know guys
Cheers
Grant

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