[DeTomaso] Regearing Your ZF

Ken Green kenn_green at yahoo.com
Fri Mar 18 09:36:59 EDT 2011


I don't know about the 3.77, but Lloyd told me that the 3.20 pinion is a thicker and stronger than the 4.22.
 
Ken

--- On Thu, 3/17/11, Thomas Tornblom <Thomas.Tornblom at hax.se> wrote:


From: Thomas Tornblom <Thomas.Tornblom at hax.se>
Subject: Re: [DeTomaso] Regearing Your ZF
To: detomaso at realbig.com
Date: Thursday, March 17, 2011, 11:59 PM


Another issue I have with that article is the section on 4.22 and 3.77 
ring and pinion, and that only the ring gear needs to be changed. I 
don't see how that would work.

The ring and pinion is normally a matched set, and although the 4.22 and 
3.77 sets probably has the same number of teeth on the pinion, the 
modulus and diameter has to be different. The 4.22 ring gear is probably 
thicker and the pinion smaller, while the 3.77 ring gear is thinner and 
the pinion larger, otherwise I can't see how it could possibly work.

Thomas

2011-03-18 08:34, doug351c skrev:
> Jack,
>
> In your recent article on ZF's you cited a stock 5th gear ratio as 21/26
> teeth or 0.8077.  I've been adding to my ZF gear ratio/speed calculator
> Excel spreadsheet over the years and in all that time I haven't run across
> that 5th gear ratio.  And it's not the same as the stock 5th on mine which
> is 0.705.  The RBT website doesn't list it either.  Can you confirm that it
> indeed exists and is not a typo.  If so, I'd like to add it to my list of
> produced ratios.
>
> Doug Braun
> blue 73L #550
>
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