Bedford CF gearbox change ?
John Jenner
I think I have read somewhere that it is possible to fit a 5 speed box on
the petrol 2.3lt Bedford CF...
Anyone have any experience of this conversion ?
Cheers JJ
Niall
wrote:
The 5 speed boxes are crawler first, not overdrive top.
Is this what you want?
Even if you can find a high ratio axle, the 4 speed first gear is low
enough unless you're at max. gross weight.
ISTR there was an overdrive option, but where you'ld get one now...
--
Niall
Peter Wedlake
I've no experience of the conversion but you will need to find a late VX 490 a
'sporty' version of the Victor. These were fitted with Getrag 5 speed boxes, But
I think they also fitted them to The CF, the only odd think is the gear change,
1st is left and back can make moving off interesting. The box is not an
overdrive box though top is 1:1 ratio.
Cheers
Pete
>On Fri, 15 Jan 1999 19:49:54 -0800, "John Jenner" <m...@eclipse.co.uk> wrote:
>Hi
>I think I have read somewhere that it is possible to fit a 5 speed box on
>the petrol 2.3lt Bedford CF...
>
>Anyone have any experience of this conversion ?
>
>Cheers JJ
>
Niall
Wedlake) wrote:
>Hi John
>I've no experience of the conversion but you will need to find a late VX 490 a
>'sporty' version of the Victor. These were fitted with Getrag 5 speed boxes, But
>I think they also fitted them to The CF, the only odd think is the gear change,
>1st is left and back can make moving off interesting. The box is not an
>overdrive box though top is 1:1 ratio.
>
There were ZF and Vauxhall/ Bedford 5 speed boxes fitted to CFs.
The Haynes manual for the CF covers them.
If yours is a SWB, I'm not sure that the 5 speed was an option.
Not a great problem if it wasn't; a propshaft specialist will graft
the front yoke of an LWB prop onto a SWB prop and correct the length
fairly cheaply.
The problem is all the boxes are direct top, not overdrive.
--
Niall
John Jenner
What's the differance between a 1:1 ratio top gear & overdrive.
(forgive my ignorance!)
Had a look in the haynes manal, no mention of current ratio's for Vauxhall 4
speed box on short axle CF, any idea what they are ?
Cheers JJ
John Jenner
Thanks for your responses
What is the differance between 1:1 ratio on top gear & overdrive ?
(forgive my ignorance)
Do you know what the ratio's are on my current Vauxhall 4 speed box,
the haynes manual does not say ?
Cheers JJ
>>1st is left and back can make moving off interesting. The box is not an
>>overdrive box though top is 1:1 ratio.
>>
>There were ZF and Vauxhall/ Bedford 5 speed boxes fitted to CFs.
>The Haynes manual for the CF covers them.
>
Peter Wedlake
On the original 4 speed gearboxes 4th gear was a direct top drive through the
gear box, one revolution on the input side gave one revolution on the output
side. On the five speed overdrive gearboxes, the input drive would run slower
than the output side in 5th thereby allowing the engine to run at lower revs for
the same speed as 4th would produce, giving better fuel mileage and less stress
on the engine.
I used to have a workshop manual for the 2.3 engine but long time gone. I can
remember many years ago when our local vauxhall dealer was getting rid of some
old stock I bought a brand new 2.3 short engine, with crank, pistons and block
for 25 GBP.
Cheers
Pete
On Sun, 17 Jan 1999 23:43:06 -0800, "John Jenner" <m...@eclipse.co.uk> wrote:
>Thanks for you responses
>
>What's the differance between a 1:1 ratio top gear & overdrive.
>(forgive my ignorance!)
>
>Had a look in the haynes manal, no mention of current ratio's for Vauxhall 4
>speed box on short axle CF, any idea what they are ?
>
>Cheers JJ
>
Niall
wrote:
>Hi
>Thanks for your responses
>
>What is the differance between 1:1 ratio on top gear & overdrive ?
>(forgive my ignorance)
The 5 speed 'boxes on most modern vehicles have 5th gear higher than
1:1 to allow high speed cruising at low engine revs for economy and
quietness. This is sometimes known as an "overdrive" ratio because its
effect is the same as the additional gearbox mounted on the gearbox
output shaft known as an "overdrive unit" which used to be the
preferred method of acheiving this.
This is the usual reason for wanting a 5 speed box; however the units
generally available for the CF were intended for heavily loaded
vehicles, hence they have an extra low first gear and 5th gear is 1:1
ratio the same as a four speed box.
If there was a suitable high ratio rear axle available, this could be
used with the 5 speed box to acheive the same end result as a 5 speed
with an overdrive 5th, however such an axle is not available.
>
>Do you know what the ratio's are on my current Vauxhall 4 speed box,
>the haynes manual does not say ?
IIRC the information is in there somewhere, possibly in the form of
figures for mph per 1000 rpm in the various gears.
Given the rear axle ratio and the tyre diameter, the gear ratios can
be worked out from this.
--
Niall
A Gallagher
gearbox; my four speed box is knacked.
Peter Wedlake <pe...@wedlake.freeserve.co.uk> wrote in article
<36a38604...@news.freeserve.net>...
> Hi John
> On the original 4 speed gearboxes 4th gear was a direct top drive through
the
> gear box, one revolution on the input side gave one revolution on the
output etc...
67gold...@gmail.com
> On Fri, 15 Jan 1999 19:49:54 -0800, "John Jenner" <m...@eclipse.co.uk>
> wrote:
> I have a CF camper with the 2.3 petrol engine and overdrive gearbox the whole camper is yours for £1000 call/text me 07860212408
> >I think I have read somewhere that it is possible to fit a 5 speed box on
> >the petrol 2.3lt Bedford CF...
> >
> >Anyone have any experience of this conversion ?
> >
