[DeTomaso] Final Drive Gear Question
MikeLDrew at aol.com
MikeLDrew at aol.com
Sun Jun 24 00:20:23 EDT 2012
In a message dated 6/23/12 21 11 41, michaelsavga at gmail.com writes:
> So what is the value of a 3.78 R & P?
>
>>>Cost? Or value?
> >In $ to acquire and install one?
>
>>>Figure about $2500 for the ring and pinion; requires professional
installation that goes along with a ZF overhaul, so figure at least another $2000
for that, and probably more.
> >Gas Mileage?
> Top Speed?
> Other Benefit?
>
>>>Both of those. The ideal combination might be the stock 4.22 ratio
with a taller fifth gear, which preserves accleration in the lower gears and
has the added advantage of being substantially less expensive than a 3.77 R&P.
I'm happy with the stock gearing, because cruising on the freeway at
3000-3500 rpm ensures my engine is 'on the cam'. People can make the mistake
of overgearing the car, and running below the torque envelope, where the
engine is soggy and inefficient. But if you have a cam that is biased towards
the bottom end, taller gearing can be more beneficial.
Mike
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