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how to identify 3.9 gears? 

 

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 Post subject: how to identify 3.9 gears?
Posted: Wed Jan 18, 2012 2:43 pm 
Getting Side Ways
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Age: 31

Posts: 771

Joined: 20th Nov 2005

Ride: AU XR8 220 Manual

Hi all,

Someone has offered me a set of 3.9 gears, how can I be sure they are 3.9 ratio? They are BW gears but can I cound the teeth or something to be sure?

Thanks
Jason
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 Post subject: Re: how to identify 3.9 gears?
Posted: Wed Jan 18, 2012 2:46 pm 
Getting Side Ways
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Age: 29

Posts: 2563

Joined: 19th Feb 2007

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Ride: 98 EL Futura

Power: 199 rwkw

Location: Lilydale
VIC, Australia

it should be stamped on the side on the crown wheel It might say 3.89 or 3.91. The 3.89 are out of the older skylines. 3.91's are the better of the two but either should be fine.

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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 Post subject: Re: how to identify 3.9 gears?
Posted: Mon Feb 20, 2012 11:48 am 
Oompa Loompa
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Age: 29

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Joined: 22nd Oct 2011

Ride: Ford AU ute

Location: Geraldton
WA, Australia

it will have it stamped onto the crown wheel or to be really sure , count the number of teeth on the crown wheel and divide by the number of teeth on the pinon gear , this will give you the true ratio ...
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