[DeTomaso] Final Drive Gear Question

[michael@michaelshortt.com]

So what is the value of a 3.78 R & P?
In $ to acquire and install one?
Gas Mileage?
Top Speed?
Other Benefit?
On Jun 23, 2012 11:20 PM, "John Buckman" <jb841 at cox.net> wrote:

> Lloyd has a great gear ratio / speed / rpm calculator on his website.
>  Make sure that you click the circle that is
> AFTER the item that you are selecting.
>
> http://www.rbttrans.com/Gear%20Ratio/page1.php
>
> An INDICATED Pantera tach reading of 3000 rpm with a GPS reading of 70 mph
> sounds about right for stock
> gearing.  However, the Pantera tach usually reads high.  With stock ZF
> gearing and 335/35/17 tires, 70 mph
> on the GPS should be around 2650 rpm.
>
> >From the RBT calculator:
>
> .704 5th gear (stock) + 4.22 R&P (stock):  3000 rpm = 79 mph
> .704 5th gear               + 4.22 R&P                  :  2650 rpm = 70
> mph
> .704 5th gear               + 3.20 R&P            :  2100 rpm = 73 mph
>
> .642 5th gear               + 3.78 R&P            :  2100 rpm = 70 mph
>
> .620 5th gear                + 4.22 R&P           :  3000 rpm = 90 mph
> .620 5th gear           + 3.78 R&P           :  2100 rpm = 70 mph
>
> One thing that may cause different tach readings is an aftermarket
> ignition system with a tach adapter.
> The tach adapter *could* make the tach reading more accurate.
>
> John
>
>
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