Series 3 Differentials

M

Mike M

Guest

• Oct 17, 2005

• #1

My standard differential gearing is 4.7:1. I understand that I can fit
3.5:1 units (? from early Range Rovers).

Please can anyone tell me how to distinguish between these two units when
they are laid on an autojumble stand?

Thanks

Mike

 

B

beamendsltd

Guest

• Oct 17, 2005

• #2

In message <[email protected]>
"Mike M" <[email protected]> wrote:

> My standard differential gearing is 4.7:1. I understand that I can fit
> 3.5:1 units (? from early Range Rovers).
>
> Please can anyone tell me how to distinguish between these two units when
> they are laid on an autojumble stand?
>
> Thanks
>
> Mike
>
>
>

The only sure way is count the teeth!

Richard

--
www.beamends-lrspares.co.uk [email protected]
Running a business in a Microsoft free environment - it can be done
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D

Dave Liquorice

Guest

• Oct 17, 2005

• #3

On Mon, 17 Oct 2005 12:11:02 +0000 (UTC), beamendsltd wrote:

>> My standard differential gearing is 4.7:1. I understand that I can
>> fit 3.5:1 units (? from early Range Rovers).
>>
>> Please can anyone tell me how to distinguish between these two
>> units when they are laid on an autojumble stand?
>
> The only sure way is count the teeth!

Couldn't you hold one hub still, turn the other and see how much the
input rotates? There might be a fiddle factor of two to apply to the
ratio either multiplication or division (is supect the former more
than the latter) to work out the actual ratio.

(Makes mental note to find some model diffs to play with...)

--
Cheers [email protected]
Dave. pam is missing e-mail

 

D

DavidM

Guest

• Oct 17, 2005

• #4

>>My standard differential gearing is 4.7:1. I understand that I can fit
>>3.5:1 units (? from early Range Rovers).
>>
>>Please can anyone tell me how to distinguish between these two units when
>>they are laid on an autojumble stand?

> The only sure way is count the teeth!

I've got one for sale, it was in my SIII when I bought it. We whipped it
out pretty sharpish and put a proper one in it's place.
If you find out exactly how many teeth you want I can double check it.
It's in North Essex.
David

 

T

Tom Woods

Guest

• Oct 17, 2005

• #5

On Mon, 17 Oct 2005 14:29:05 +0100 (BST), "Dave Liquorice"
<[email protected]> wrote:

>On Mon, 17 Oct 2005 12:11:02 +0000 (UTC), beamendsltd wrote:
>
>>> My standard differential gearing is 4.7:1. I understand that I can
>>> fit 3.5:1 units (? from early Range Rovers).
>>>
>>> Please can anyone tell me how to distinguish between these two
>>> units when they are laid on an autojumble stand?
>>
>> The only sure way is count the teeth!
>
>Couldn't you hold one hub still, turn the other and see how much the
>input rotates? There might be a fiddle factor of two to apply to the
>ratio either multiplication or division (is supect the former more
>than the latter) to work out the actual ratio.

One of the old landy mags that i have lying around at home and was
flicking through yesterday has a guide to working out what diff is
fitted in an axle by turning the wheels and watching how far the prop
turns.
I'll copy it out if i can find it again. It was an interesting read.

 

D

Dougal

Guest

• Oct 17, 2005

• #6

Tom Woods wrote:

> On Mon, 17 Oct 2005 14:29:05 +0100 (BST), "Dave Liquorice"
> <[email protected]> wrote:
>
>>On Mon, 17 Oct 2005 12:11:02 +0000 (UTC), beamendsltd wrote:
>>
>>>>My standard differential gearing is 4.7:1. I understand that I can
>>>>fit 3.5:1 units (? from early Range Rovers).
>>>>
>>>>Please can anyone tell me how to distinguish between these two
>>>>units when they are laid on an autojumble stand?
>>>
>>>The only sure way is count the teeth!
>>
>>Couldn't you hold one hub still, turn the other and see how much the
>>input rotates? There might be a fiddle factor of two to apply to the
>>ratio either multiplication or division (is supect the former more
>>than the latter) to work out the actual ratio.
>
> One of the old landy mags that i have lying around at home and was
> flicking through yesterday has a guide to working out what diff is
> fitted in an axle by turning the wheels and watching how far the prop
> turns.
> I'll copy it out if i can find it again. It was an interesting read.

Come on people - read the whole story.

The OP stated that the 'diff.' would be lying on a table not stuck
hidden inside the casing, so all this about holding one part and turning
the other is not only irrelevant but actually very difficult!

Just count the number of turns required at the input yoke to turn the
bevel gear once and there's your answer.

Alternatively, as the man said, count the teeth. Counting the teeth in
an assembled 'diff.' is not that easy

If you must, count the number of teeth on the bevel gear and divide by
the number of teeth on the pinion to get either 4.7 or 3.54 - assuming
that it is a standard Landy 'diff.' that you are viewing.

 

D

Dave Liquorice

Guest

• Oct 17, 2005

• #7

On Mon, 17 Oct 2005 19:35:00 +0100, Dougal wrote:

> The OP stated that the 'diff.' would be lying on a table not stuck
> hidden inside the casing, so all this about holding one part and
> turning the other is not only irrelevant but actually very
> difficult!

IMHO the OPs orginal comment is open to interpretation and he now has
two, no sorry three, versions to work on depending on what he finds on
the autojumble table...

--
Cheers [email protected]
Dave. pam is missing e-mail

 

O

Oily

Guest

• Oct 19, 2005

• #8

> Alternatively, as the man said, count the teeth. Counting the teeth in
> an assembled 'diff.' is not that easy
>
> If you must, count the number of teeth on the bevel gear and divide by
> the number of teeth on the pinion to get either 4.7 or 3.54 - assuming
> that it is a standard Landy 'diff.' that you are viewing.

The Range Rover diff has 13 teeth on the pinion as against 10 on the
Landrover ones and it's quite obvious without counting and you can see it
quite easily if you look inside a diff unit on an autojumble table. Also
Range Rover has 46 teeth on the crown wheel as against 47 on the Landrover.
All the old interchangeable Rover car diffs have 10 on the pinion as 10/43,
10/39 etc.

HTH Martin