Hi Guys , this may be a simple question but I am trying to find out what ratio diff I have without removing the centre , I know when out you turn the tailshaft until the crown wheel has done a full circle IE 3.54 to 1 etc

When still in the diff is it different

Cheers Craig

Not if the diff is a single spinner, It will give you a rough idea.

It may have a tag on one of the nuts, that connects the center to the housing.
The rpm at 100km/h will be close to what diff ratio you have.

Thanks Maxrs

I tried looking for the tag earlier , that would have been nice , the diff is out of car so I cant try the 100 km thing either

When I tried earlier , 1 turn of the wheel studs was roughly 2 turns of tailshaft end so no closer to an answer
If worse comes to worse I will pull it out , I just want to know what it is to know if to keep as a spare for mine or get rid of it

Cheers for the email

Craig

Try tuning both axles at the same time, and watch the pinion flang.
Or quote the number/letters on the outside. I can check the centers i have here.

Craig

If you have 1 wheel on the ground and turn the other you won't know as the side (axle) gearing also has an effect.

Ideally you need to have both wheels off the ground and turn the input shaft and ensure both wheels are turning in unison.

quote:

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Originally posted by pottergt

Thanks Maxrs

I tried looking for the tag earlier , that would have been nice , the diff is out of car so I cant try the 100 km thing either

When I tried earlier , 1 turn of the wheel studs was roughly 2 turns of tailshaft end so no closer to an answer
If worse comes to worse I will pull it out , I just want to know what it is to know if to keep as a spare for mine or get rid of it

Cheers for the email

Craig

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try turning the tailshaft.
put a mark at 12oclock on the axle flange and tailshaft flange.
a 3.54 should stop axle at approx 6 oclock posi, 3.77 would be approx 9 oclock and 4.11 1 oclock.
i cant remember but depending which part you turn you may have to double the reading?

i hope im explaining it right, cos this is how i checked the diff for my wagon when i got it.
was told it was a 3.45, but it had 3.23 tags. luckily it was a 3.45.

quote:

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Originally posted by Paul Dunstan

Craig

If you have 1 wheel on the ground and turn the other you won't know as the side (axle) gearing also has an effect.

Ideally you need to have both wheels off the ground and turn the input shaft and ensure both wheels are turning in unison.

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i think on a single spinner having 1 wheel stationary, while turning 1 would give a better indication just incase is swapping left n right ( something like that & it would be hard to make both go the same ammount of turns) i remember having hassles checking a diff a while ago.


or just pull the centre and count the teeth

Hi All , thanks for the tips , I tried a few versions of the above and pretty sure its a 3.54 , if that's the case its worth the effort of dismantling for a better look

Cheers Guys