[DeTomaso] Question about modifying ZF gearing for high performanceengine.

[Kirk Evans]

Boyd,

If you have a .62 fifth installed, it will give you a close equivalent to a 
377 final drive for good HW cruse but you'll retain reasonable acceleration. 
Choosing gears is directly related to your intended usage----which is??? I 
just collaborated today with Dennis Qualla about this exact issue for 
another customer. We both agree a .62 5th is the best bang for the buck in 
most instances for a solid range of performance on the street using a 450 to 
550 HP range engine. Good luck.

Kirk



----- Original Message ----- 
From: "boyd casey" <boyd411 at gmail.com>
To: "De Tomaso List" <detomaso at realbig.com>
Sent: Friday, March 12, 2010 4:25 PM
Subject: [DeTomaso] Question about modifying ZF gearing for high 
performanceengine.


>I was wondering when one repowers their Pantera with an engine that
> generates allot more Tourque and Horsepower as well as possibly higher 
> revs
> and you goal is higher top speed as well as faster acceleration do people
> usually only change the pinion gear to change the final gear ratio or do
> they also change the gears1st thru 5 or just one or some of them? From
> looking at the calculator on the RBT transmission web sight, it seems like
> you can accomplish the end result of raising your top speed available with
> the higher horsepower of of a more powerfull engine. To get the optimum
> gearing at every gear you could change the gears and the pinion gear but 
> the
> cost would be very substanntial.The gear sets for 2nd, 3rd, 4th, and 5th
> are $1068.75 apiece. That's $4275.00 for 2nd thru 5th ( plus labor) The 
> ring
> and pinion set is $2801.25 (plus labor)  Thats $7076.25 just for parts to
> change the gears and ring and pinion set. So my question is what have 
> other
> people done when they made engine mods that produced large horsepower
> increases and possibly increased revs acheive the desiredgearing to 
> provide
> the right gear ratios to provide both reasonable accelleration as well as
> top speed. (above the 168 mph limatation of the stock set up at 6800 rpm).
>
> Boyd
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