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OT:Re: How can I tell if my FF is <81 or later?



Jeze Dan, writing a doctoral on 5th gear analysis?
(Now I am going back to re read that mail....)



Julie Macfarlane
1981 MKI 2L 16v w 2Y
"For good health : EAT RICE!"
Amsterdam NY





>From: "Dan Bubb" <jdbubb@ix.netcom.com>
>To: "Mark" <mardak@cogeco.ca>,"'List'" <scirocco-l@scirocco.org>
>Subject: Re: How can I tell if my FF is <81 or later?
>Date: Sat, 10 Apr 2004 07:13:49 -0400
>
>I've got an FO w/.76 and an FN w/.71 so, unfortunately the serial numbers 
>don't do us any good.
>Pulling the 5th gear housing and looking at the gear is the most positive 
>way to tell. You only have
>to remove 6 bolts and tap the housing off with a hammer.
>Peter has the gaskets seperately for like $7 so you don't need to buy the 
>whole gasket seal kit if
>you bung up the gasket.
>The gear count for the .76 ratio is 62/44.
>The gear count for the .71 ratio is 38/27.
>A quick little tooth count is all it takes.
>While you're swaping 5th make sure the gear on the pinion shaft is a tight 
>fit on the splines. Every
>broken 5th gear that I've seen (only 3 so it's not statistically relavant) 
>wobbles on the splines.
>Don't know if it's the wobble on the splines that causes the teeth to break 
>or the teeth breaking
>that causes the gear to wobble on the shaft, but I would not install a 5th 
>gear that isn't tight on
>the splines in any case. Especially if you have bunch of power.
>On yet another note, the tooth count for the .76 ratio is really high (108) 
>so it has really small
>teeth that aren't that strong. The .75 is a stronger set at 89. The .71 is 
>stronger yet at 65 if you
>have the engine to pull it.
>So, guess which 5th gear is going in the nephew's JH junkyard turbo Rocco!
>Oh, I forgot. There are two different .71 gear sets out there (according to 
>ETKA). The other set has
>a gear count of 52/37.
>OK! That's all I know about this. And I mean ALL!
>Dan
>
>
>----- Original Message -----
>From: "Mark" <mardak@cogeco.ca>
>To: "'List'" <scirocco-l@scirocco.org>
>Sent: Saturday, April 10, 2004 3:12 AM
>Subject: How can I tell if my FF is <81 or later?
>
>
> > I have a spare FF tranny that I'd like to pillage for the fifth gear to
> > swap into the 4K I have in the winter beater/tow vehicle...
> >
> > The tranny chart on www.scirocco.org says that 80 and earlier FF
> > trannies had the .76 fifth, while the later units have a .71 fifth.  How
> > can I tell which one mine is?
> >
> > Here's the numbers off of the tranny.
> >
> > Inside bellhousing:  020 301 107 C
> >                      WW0 12a
> >
> > Outside, on bottom:  FF 26011
> >
> > Anyone help me out?  I'd like to stay away from the .71 gear as it'll be
> > a little too tall when I'm towing.  I have another FF in the 80 as well,
> > so hopefully one of them has the .76 gear.
> >
> > If I remove the gear is there a way of telling which one it is?  (dia.?)
> >
> > Thanks!
> >
> > Mark.
> > 75
> > 80 S
> > 81 S  2.0 ABA/JH/4K
> >
> >
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>
>
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