Holy Diff

[TeZZaP]

Just stripping down the front of my reno project and I have noticed that the front diff housing is different from the rear... what are the two holes in the bottom of my front diff (from a Series 3) for?

[isuzurover]

This is the later style rangie/90/110 casing. It was made so that you could bolt on a track rod protector (coillers run track rods at the back).

Check it doesn't have a 3.54 centre. But some late model SIIIs had these casings from the factory.

[TeZZaP]

This is the later style rangie/90/110 casing. It was made so that you could bolt on a track rod protector (coillers run track rods at the back).

Check it doesn't have a 3.54 centre. But some late model SIIIs had these casings from the factory.

I had assumed that it was some kind of 'drain'; there appears to be a hole on the inside roughly where the oil seal sits... sorry, what's a '3.54' centre?

[isuzurover]

No, they are not drains. They do not connect to the oil gallery at all.

3.54:1 is the alternate ratio (fitted to all coilers, and SIII Stage 1s)

4.7:1 ratio diffs were fitted to all series (except SIII Stage 1s)

[TeZZaP]

No, they are not drains. They do not connect to the oil gallery at all.

3.54:1 is the alternate ratio (fitted to all coilers, and SIII Stage 1s)

4.7:1 ratio diffs were fitted to all series (except SIII Stage 1s)

How do you tell - does it actually say that on the diff somewhere?

[dandlandyman]

Divide the number of teeth on the crownwheel by the number of the pinion teeth. The Range Rovers use those holes to mount the steering damper.

Dan.
69 2a 88" pet4, 74 3 109" pet4, 68 2b FC pet6.

[TeZZaP]

Divide the number of teeth on the crownwheel by the number of the pinion teeth. The Range Rovers use those holes to mount the steering damper.

Dan.
69 2a 88" pet4, 74 3 109" pet4, 68 2b FC pet6.

OK, thanks, I'll try and get a count later... I'll have to track down something to mark it with, otherwise I may keep going around and around counting!

[isuzurover]

What Dan said. Series diffs have 47 crownwheel and 10 pinion.

https://www.aulro.com/afvb/images/imported/2008/10/986.jpg
You can see a small steel track rod guard bolted to those holes in this image.

[Psimpson7]

IsuzuRover,

Where did you get that trackrod from?

Cheers
Pete

[isuzurover]

IsuzuRover,

Where did you get that trackrod from?

Cheers
Pete

Not mine, but I think that one is made by rockware in the US. It is a bit like an inverted front salisbury track rod.

[Psimpson7]

cheers :)

[Blknight.aus]

if your ratio comes out as 3.54:1 as opposed to 4.7:1 and you want to go back to 4.7:1 I can possabley help you out.

[TeZZaP]

Hmm, I must have counted wrong, my crown-wheel has 47 teeth and the pinion 16. 47/16 = 2.9375... what am I doing wrong!?

[mike 90 RR]

Hmm, I must have counted wrong, my crown-wheel has 47 teeth and the pinion 16. 47/16 = 2.9375... what am I doing wrong!?

Count how many times the tailshaft turns (this is the pinion side) to turn the axle 10 times (this the crown side)
Mark a line on tailshaft & Mark a line on wheel so you can line up & count turns on each item

should work out to

(example) 47.0 turns of pinion to 10 turns crown= 4.7 to 1
(example) 35.4 turns of pinion to 10 turns crown = 3.54 to 1

Gives a idea of what you have without having to rip out diffs :)

[TeZZaP]

OK, sorted, its 4.7:1

Thanks all for your input.

Do you think it's worth popping a couple of bolts into those holes to stop them filling with crap?

:D

[Tank]

No, not necessary, Regards Frank.

[rovercare]

Count how many times the tailshaft turns (this is the pinion side) to turn the axle 10 times (this the crown side)
Mark a line on tailshaft & Mark a line on wheel so you can line up & count turns on each item

should work out to

(example) 47.0 turns of pinion to 10 turns crown= 4.7 to 1
(example) 35.4 turns of pinion to 10 turns crown = 3.54 to 1

Gives a idea of what you have without having to rip out diffs :)

Ummm, no it won't enless you either

A. lock the centre.........if your a lucky boy:D
B. turn BOTH axles the same amount of times

Turning one wheel will be a figure, double of that found by turning both axles, and any differential action that isn;t accounted for, will muff it up aswell

[mike 90 RR]

Ummm, no it won't enless you either

A. lock the centre.........if your a lucky boy:D
B. turn BOTH axles the same amount of times

Turning one wheel will be a figure, double of that found by turning both axles, and any differential action that isn;t accounted for, will muff it up aswell

Now ya got my head scratching :(

Your gonna make me jack up my rear wheel on my ford / crawl underneath / find the gear ratio tag & do the turns ;) ... Just to check, so I can figure it out ;)

Drat's ..... Another job to do next weekend ;)

All good

Mike

:)

[rovercare]

Now ya got my head scratching :(

Your gonna make me jack up my rear wheel on my ford / crawl underneath / find the gear ratio tag & do the turns ;) ... Just to check, so I can figure it out ;)

Drat's ..... Another job to do next weekend ;)

All good

Mike

:)

Or you could just accept the fact I'm right?:D:D

Keep us informed, preferably ad some piccies to:)

[mike 90 RR]

Or you could just accept the fact I'm right?:D:D

Keep us informed, preferably ad some piccies to:)

I do accept that your right .... I'm sort of the type that has to see "what happens" ;)


Pictures??? ... this says it all right now :wallbash:


Mike

:(

[mike 90 RR]

Oops double post

:wallbash: