[DeTomaso] Fwd: Re: Regearing Your ZF

[Thomas Tornblom]

I see in the latest Newsletter that Jack reiterates his view that a 3.78 
ring gear would work with a 4.22 pinion although this time he doesn't 
recommend doing so as the ring and pinion are a matched set.

Although both the 4.22 and the 3.77 pinions have nine teeth, I am 
absolutely certain that the gears are not the same and that it will be 
impossible to install a 3.77 ring gear with a 4.22 pinion, unless you 
are completely blind. I suspect the gears wouldn't even touch each other.

Thomas


-------- Ursprungligt meddelande --------
Ämne: Re: [DeTomaso] Regearing Your ZF
Datum: Fri, 18 Mar 2011 07:59:02 +0100
Från: Thomas Tornblom <Thomas.Tornblom at hax.se>
Till: detomaso at realbig.com

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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