No.
BC,B5 and IB5's will all fit fine, as Tony says early Zetec ones will 
fit as well, make sure they are front starter though as some of the 
later ones (around 1996) moved the starter to the rear.
Before 1995 is fairly safe, after that the release bearing spigot got 
bigger and finding the correct size release bearing to match the CVH 
clutch is a pain.

Only the early (mk3 Escort, early Mk2 Fiesta) diesels had higher ratios, 
the later diesel boxes had the same standard ratios as the larger petrol 
engined cars.
One from a smaller engined car will have lower gearing so give you 
better acceleration but lower top speed.
There are some exceptions, the XR2i and RS1800i are low geared as well.

The Escort RST is the same gearing as the XR2 so is a good bet if you 
want the LSD

Don't forget if it comes from a car with larger rolling radius 
wheels/tyres you will need to swap the speedo gear in the gearbox with 
the one from your fiesta gearbox, do this before you fit the new gearbox !

Jim



lewis gill wrote:
> i have also heard that but i was also told an IB5 wont fit only a bc 
> box will fit? is this correct?
>  
> > Date: Sun, 19 Apr 2009 21:35:54 +0100
> > From: [email protected]
> > To: [email protected]
> > Subject: [Quantum Owners] Re: gearbox trouble?
> >
> >
> > If I remember correctly, any gearbox with the IB5 bellhousing will fit
> > (I'm sure Jim can confirm), which includes some of the early Zetecs (Up
> > to the early nineties).
> >
> > Tony
> >
> > Andy Haworth wrote:
> > > Anything from a CVH engined car will do; Fiesta, Escort, Orion etc
> > >
> > > Gear ratios will be different on some, an RS Turbo box for 
> example. Escort
> > > ones had LSD's, Fiestas didn't.
> > >
> > > Diesel one is worth tracking down if you can find a decent one still
> > >
> > >
> > >
> > > Andy
> > >
> > > -----Original Message-----
> > > From: [email protected] 
> [mailto:[email protected]]
> > > On Behalf Of lewis
> > > Sent: 19 April 2009 13:46
> > > To: Quantum Owners Group
> > > Subject: [Quantum Owners] gearbox trouble?
> > >
> > >
> > > my gearbox on my 2+2 has broke, and i need a new one. i just wondered
> > > if anyone could give me some info on what other gearboxes will fit. i
> > > currently have an xr2 mk2 gearbox and i just wondered if xr3 boxes or
> > > ztecs etc will fit. many thanks
> > >
> > >
> > >
> > > >
> > >
> > >
> >
> >
> >


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