Re: Diff ratios

Post by vivarenza » Fri Mar 02, 2018 2:44 pm
Joined: Sat Jan 21, 2017 9:15 pm
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Phil Bradshaw wrote:9/37 (4.111:1) fitted as standard to CF2 models F,G,1,3/00 (7181283 gear and pinion set).
Is that also option on older models. ’Cause sportprt manual is dated 1979 and CF2 was introduced five years later in 1984.

Re: Diff ratios

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Post by Phil Bradshaw » Club admin » Fri Mar 02, 2018 5:28 pm
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7181283 appears to be an old number that pre-dates CF start of production and only occurs in CF2 parts listings.

I don't know which model 7181283 originally was listed for; my guess is PA/PB Cresta with overdrive.
  • What is real is not the external form but the idea, the essence of things. Constantin Brâncuși

Re: Diff ratios

Post by vivarenza » Mon Mar 05, 2018 11:53 am
Joined: Sat Jan 21, 2017 9:15 pm
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Phil Bradshaw wrote:7181283 appears to be an old number that pre-dates CF start of production and only occurs in CF2 parts listings.

I don't know which model 7181283 originally was listed for; my guess is PA/PB Cresta with overdrive.
Weird. I made lot of research. And don't find that from any partsbooks I or friend of mine have(F, FB, PB, FD, HC, FE, VX, CF.)
But luckily I found out that export PB 2600 models should have 3,9:1 - 10/39 ratio. Thats not impossible to find from Finland.
I'm planning to fit higher gear ratio and overdrive to our CF, so "basic" 3,45:1 - 11/38 and even 3,7:1 - 10/37 ratio is possibly too high.

E. i got answer from facebook. Its listed to CA bedford. I have also made this list about ratios. I'ts not finished yet and it have some issues.
https://docs.google.com/document/d/1eNH ... sp=sharing

Re: Diff ratios

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Post by Phil Bradshaw » Club admin » Wed Mar 07, 2018 9:52 am
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CA it is now I've checked: 7181283 (9/37) final drive was optional from Ch. 6327600 to end of production.

While talking about CAs - 7181281 for 8/37, 7181282 for 7/37 from Ch. 6327600.

(Odd I should forget about the CA - my first motor was a 1962 CASV which had many modifications done to it including a rear axle swap from a 1969 CALV.)
  • What is real is not the external form but the idea, the essence of things. Constantin Brâncuși

Re: Diff ratios

Post by bedfordcf2van Contact bedfordcf2van » Tue Nov 06, 2018 11:01 am
Joined: Mon Sep 07, 2015 5:47 pm
Posts: 94
I'm working on a engine swap in a 1977 CF250 and thinking that eventually the diff will have to be swapped as well.

The CF1 should have 5.29:1 gears. So I went and checked manually and it actually has 4.63:1 gears!

That's the same gearing as my facelift model. I'm thinking that it must have been swapped out sometime in the past.

What is strange is that diff has the same cover as mine, but has the usual CF1 single leaf springs, 9" drums and CF1 shock mounts.

:?

Re: Diff ratios

Post by bedfordcf2van Contact bedfordcf2van » Tue Nov 06, 2018 11:06 am
Joined: Mon Sep 07, 2015 5:47 pm
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Here is a pic of both diffs:

Image

Re: Diff ratios

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Post by Phil Bradshaw » Club admin » Tue Nov 06, 2018 1:52 pm
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I have never come across a coherent record of standard and optional final drive ratios for CFs.

What I have found so far from trawling GM documentation 1969-87:

8/47 (5.8571:1) CF350L Code 040; CF2 350L diesel Code 926

7/37 (5.2857:1) short wheelbase* petrol

9/47 (5.222:1) long wheelbase* 35cwt; CF280 and CF350 diesel, optional for petrol; CF2 CF280 and CF350 petrol Code 924

8/41 (5.125:1) CF350L

9/44 (4.8889:1) CF Electric

8/37 (4.625:1) short wheelbase* diesel, optional for petrol; CF230, CF250; CF2 fleet CF230 and CF250 Code 912

11/49 (4.4545:1) long wheelbase* 25cwt; CF280 petrol, optional for CF280 diesel and CF350 petrol; CF2 CF280, CF350 petrol, CF2 3.3 litre with SVOS 8596, 8561 or 8559

7/30 (4.2857:1) optional for short wheelbase* diesel

9/37 (4.1111:1) CF2 short wheelbase

* Earlier models prior to badges CF230, CF250 etc.

EDIT

9/37 for CF2 added.
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  • What is real is not the external form but the idea, the essence of things. Constantin Brâncuși

Re: Diff ratios

Post by bedfordcf2van Contact bedfordcf2van » Thu Nov 08, 2018 1:40 pm
Joined: Mon Sep 07, 2015 5:47 pm
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I was going off the specs brochures.

In Portugal, there weren't all the options available in the UK, there were no special variants like 4x4, ice cream trucks, ambulances, recovery, caravans, etc..
For the most part only 230/250/280 vans and 350 flatbed pickups. Plus all of them had diesel engines.
And also the newer CF2's never sold here (they were replaced with Isuzu-Bedfords in 1984).

So for those reasons I think almost all of them will have either 8/37 or 7/37 ....


:roll:

Re: Diff ratios

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Post by Phil Bradshaw » Club admin » Thu Nov 08, 2018 5:08 pm
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The GM information for UK (Luton) doesn't cover models built in other plants. Useful to know what the differences were; might help another member at some point. :thumb:
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  • What is real is not the external form but the idea, the essence of things. Constantin Brâncuși

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