Diff ratios

User avatar
Post by Packern Contact Packern » Tue Feb 13, 2018 4:59 pm
Joined: Fri Sep 11, 2015 8:24 pm
Posts: 46
Hi All

I know I have seen these somewhere but cant for the life of me locate them.

What are the different diff ratios for different models ?

The reason for asking this (sorry if its posted else where) is that I have acquired another rear axle with the ratio 8/37 looks like a Bedford type and is it the right one for ours. Its a CF1 250.

Thanks
Nigel Packer

Re: Diff ratios

User avatar
Post by Phil Bradshaw » Club admin » Tue Feb 13, 2018 11:38 pm
Joined: Sun Sep 02, 2012 7:15 pm
Posts: 3373
CF1 250 model normally has the 8/37 final drive ratio unless fitted with a factory option (Code) which may be on the Service Parts Identification (SPI) plate alongside the weights plate attached to the passenger side door frame (lock) side or vertical panel in the passenger foot well (chassis cowl models).

Codes
  • 904 - 7/37
    912 - 8/37
    925 - 9/47
    925 - 11/49
    926 - 7/41
  • What is real is not the external form but the idea, the essence of things. Constantin Brâncuși

Re: Diff ratios

User avatar
Post by Packern Contact Packern » Wed Feb 14, 2018 4:20 pm
Joined: Fri Sep 11, 2015 8:24 pm
Posts: 46
Cheers Phil

I have just had a look at the plates on the passenger door pillar and there is the axle weight plate, the Vauxhall BS plate and another one with just a string of numbers stamped into it. Is this the plate? The first set of numbers seem to have the chassis number as part of it. :?:
Nigel Packer

Re: Diff ratios

User avatar
Post by Phil Bradshaw » Club admin » Wed Feb 14, 2018 4:53 pm
Joined: Sun Sep 02, 2012 7:15 pm
Posts: 3373
SPI plate -

Image

3-character codes are Factory options
Any 4-character codes (usually the last on a plate) are Special Version Option Scheme (SVOS) codes for body builders and fleet operators.
  • What is real is not the external form but the idea, the essence of things. Constantin Brâncuși

Re: Diff ratios

User avatar
Post by Packern Contact Packern » Wed Feb 14, 2018 5:27 pm
Joined: Fri Sep 11, 2015 8:24 pm
Posts: 46
Cheers mate thank you that's the one :)

I have also just read another of your posts that suggest that the axle code wont be on the plate if its bog standard so that sorts that little mystery. :thumb: :thumb: so 8/37 it is then
Nigel Packer

Re: Diff ratios

User avatar
Post by Phil Bradshaw » Club admin » Wed Feb 14, 2018 5:48 pm
Joined: Sun Sep 02, 2012 7:15 pm
Posts: 3373
Standard axle ratio is related to the chassis number and production year group, like engine type, chassis configuration etc. Codes indicate non-standard options and versions.
  • What is real is not the external form but the idea, the essence of things. Constantin Brâncuși

Re: Diff ratios

User avatar
Post by Packern Contact Packern » Thu Feb 15, 2018 5:57 pm
Joined: Fri Sep 11, 2015 8:24 pm
Posts: 46
Thanks again Phil

Bear with me I still have a lot to learn :thumb:
Nigel Packer

Re: Diff ratios

User avatar
Post by Phil Bradshaw » Club admin » Fri Feb 16, 2018 9:56 am
Joined: Sun Sep 02, 2012 7:15 pm
Posts: 3373
S'ok, it's what the forum is for. :thumb:
  • What is real is not the external form but the idea, the essence of things. Constantin Brâncuși

Re: Diff ratios

Post by vivarenza » Thu Mar 01, 2018 2:34 pm
Joined: Sat Jan 21, 2017 9:15 pm
Posts: 19
On Droopsnoot firenza there is same axle as in Ventora, Cresta and CF etc. but it has short pinion axle like CF.(Ventora and Cresta etc. has long pinion.) I have a Vauxhall Sportpart manual(big, thick and red folder from 1979). It says that for droopsnoot firenza there is two different diff ratios that can used on rallying 4,1:1 and 4,6:1(8/37)(stantard ratio in road model is 3,7:1). Part number of the latter is the same as in CF partsbook(7181281). Does any body knows where that 4,1 ratio is used? Its part number is 7181283. Is it from later CF.s? Or from some Vauxhall passenger car?

Re: Diff ratios

User avatar
Post by Phil Bradshaw » Club admin » Fri Mar 02, 2018 10:32 am
Joined: Sun Sep 02, 2012 7:15 pm
Posts: 3373
9/37 (4.111:1) fitted as standard to CF2 models F,G,1,3/00 (7181283 gear and pinion set).
  • What is real is not the external form but the idea, the essence of things. Constantin Brâncuși

Post Reply

Return to “Rear axle and rear suspension”