[DeTomaso] Taller 5th gear for cruise

Will Demelo wdemelo at cogeco.ca
Thu Jun 17 17:12:51 EDT 2010


I'm looking at an RBT receipt from 2001 and the 3.77 R&P was $2500 and the 
5th gear was $1275
Will
----- Original Message ----- 
From: "Daniel C Jones" <daniel.c.jones2 at gmail.com>
To: "Pantera REALBIG forum" <detomaso at realbig.com>
Sent: Thursday, June 17, 2010 5:02 PM
Subject: Re: [DeTomaso] Taller 5th gear for cruise


>> Have you tried Lloyd's Gear Ratio Calculator on line:
>> http://www.rbttrans.com/Gear%20Ratio/page1.php
>
> No, I wrote my own.
>
>> The only one he could source at the time was a 0.642
>
> Good point, I'm making the assumption that all ratios are
> now in stock.  I'll have to find out if that is true.
>
>> It sounds like you already know what you want. :-)
>> The .620 is probably just what you need for cruising.
>
> Yup :-)
>
>> I guess I need more HP.
>
> We can fix that...
>
>> Dan, Larry Stock had RBT build up a ZF with a 3.20:1 R & P in a
>> 400bhp/400-ft-lb Cleveland, and after losing three Centerforce
>> clutches due to severe clutch slipping needed to just get going,
>> he pulled it and went to a 3.77:1 R & P. What is the concensus on
>> R & P changes relative to only the 5th gear pair? I notice the
>> costs are similar- around $2000.
>
> I'll be running quite a lot of cam overlap plus an aluminum
> flywheel, so I thought I'd just do the taller 5th gear.  The
> taller ring and pinions were more expensive and would raise
> first gear which might hurt clutch life.
>
> Dan Jones
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