Andrew,
The ratios in the Silvia have a 3.6 first I believe vs 3.3 in the R31. I
dont know about the 720 box but it sounds like it is a 71C. I know the 720 Z
box has a different main shaft and counter shaft to other boxes though. I
believe 3.6 first gear and a low second as well. The 71C box from the R31 is
30 mm longer than the Z18ET 71B box.and 50mm longer than a 240K 4 speed or
Stanza box.
Cross member mounts are the same on the boxes I have here.
Cheers
Feral Errol
mailto:[EMAIL PROTECTED]
http://www.datrats.com.au/
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of andrew smith
Sent: Wednesday, May 02, 2001 7:57 PM
To: [EMAIL PROTECTED]
Subject: Re: Brad and Errol
Errol,
Is the 71c gearbox the same ratios in the silvias and R31?What about the 720
4wd
with the z24,is that a 71c as a mate said he used a box out of one and he
had to
modify the L series bell housing to suit the larger bearing.Can I use the
dogleg
bell housing as it looks compatable as far as bolt pattern goes.What length
is
the 71c and what what has to be done to the crossmember.Sorry about all the
questions but it seems like the way to go.
Andrew Smith
Errol Smith wrote:
> Andrew,
> To use a 71C box you have to get the L series bell housing modified to
take
> the bigger bearings. The bearing holes are just opened up to take the
larger
> bearing and a circlip groove is machined in. This is not a real problem or
> expensive and gives a mega strong box.
>
> Cheers
> Feral Errol
> mailto:[EMAIL PROTECTED]
> http://www.datrats.com.au/
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of andrew smith
> Sent: Tuesday, May 01, 2001 12:58 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Brad and Errol
>
> Errol,
> Will the 71C box bolt straight up to an L series.What about length etc.I
> think I
> know where I can get one as I got some rear brakes off one last week.
> Andrew Smith
>
> Errol Smith wrote:
>
> > Andrew,
> > The option one gears are the same as a conventional five speed but are
> > different ratios and use a dogleg 4/5 same plane shift pattern with a
one
> to
> > one top gear. The shifter rails and selector rings are different to any
> > other Nissan stuff and in my opinion are becoming a little old for race
> use
> > now depending on previous use, due to gear cracking etc.
> > There was a supposedly option one going in Perth about twelve months ago
> and
> > I was tracking it down but it turned out to be a modded Stanza box. If
you
> > find an option one grab it for posterity and keep it on the shelf as
they
> > are not making any more of them.
> > My preference these days is for an R31 skyline box with new gears cut to
> > suit. These 71C boxes are stronger and parts are easily available.
> >
> > Cheers
> > Feral Errol
> > mailto:[EMAIL PROTECTED]
> > http://www.datrats.com.au/
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of andrew smith
> > Sent: Sunday, April 29, 2001 11:29 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Brad and Errol
> >
> > Errol,
> > Whats the story with the option 1 as far as the gears are concerned.Are
> > they straight cut or helix,dog mesh or sincromesh.Are they wider
> > gears.What about the holinger 240k box.About a year ago I passed up an
> > option 1 for $500 because it had 1to1 ratio 5th gear(silly me).Now I
> > really need something stronger than a dogleg.I'm having to nurse the
> > gearbox at the moment and I dont like doing that.
> > Andrew Smith
> >
> > Errol Smith wrote:
> >
> > > Nat,
> > > In order of preference.
> > > 1. Nismo option 1 $$$$$$$$$$$$$
> > > 2. Holinger five speed 240K box
> > > 3. 260Z 2.9 first gear five speed $600 - $800 for a goodun
> > > 4. 240K 5 speed
> > >
> > > Cheers
> > > Feral Errol
> > > mailto:[EMAIL PROTECTED]
> > > http://www.datrats.com.au/
> > >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED]
> > > [mailto:[EMAIL PROTECTED]]On Behalf Of nat P.
> > > Sent: Sunday, April 29, 2001 3:13 PM
> > > To: [EMAIL PROTECTED]
> > > Subject: Brad and Errol
> > >
> > > Morning guys, Quick question, which gearbox has the
> > > better ratios for a rally car, 180B with 4.9 LS and
> > > running 14inch rims.
> > > Cheers NAT
> > >
> > > __________________________________________________
> > > Do You Yahoo!?
> > > Yahoo! Auctions - buy the things you want at great prices
> > > http://auctions.yahoo.com/
> > >
> >
>
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