afaik:
- Final drive ratio is drive shaft to rear axle ratio.
- Over All Ratio is crankshaft to rear axle ratio usually expressed for
each gear.
Local use may differ, but this is the case in NZ.
----- Original Message -----
From: <TR6UO@aol.com>
To: <6pack@autox.team.net>; <Triumphs@autox.team.net>; <Mgs@autox.team.net>
Sent: Saturday, October 21, 2006 2:25 PM
Subject: Gear Ratios (General Automotive Question)
> I've recently found the term "Final Drive" used in both OE literature and
> conversation to mean the rear end ratio only. I've always considered the
> "final
> drive" ratio to mean a function of the top transmission gear and the rear
> axle ratio. Thus the "final drive" could be used to compare a given
> transmission married to different rear axles. An overdrive transmission
> with a 5th gear
> ratio of 0.72 married to a 4.27 axle would be a 3.07 "final drive". The
> "final drive" on a 4-speed with a direct drive and a 3.15 axle would be
> 3.15.
>
> Any input on this?
>
> Thanks
>
> Steve
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