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7" Sierra Differential
Bacon2002 - 9/9/07 at 01:24 PM

Hi,

I have a 7.5" Sierra differential (from a 2.0l 1991 XR4i) which unfortunately won't fit my build (GTS Panther).

It looks like I will need to use a 7" Sierra diff.

Does anyone know if I will be able to use my existing bolt on driveshaft and hubs (from the 7.5" differential) with a 7" Sierra diff.

Strange question I know but it is probably cheaper and easier if I can use the original driveshafts and hubs etc.

Thanks,

David

iiyama - 9/9/07 at 02:18 PM

Yup, you can. Have to take both of them apart to do it though and swap over the necessary bits. easier said then done!!!

Paul (Notts) - 9/9/07 at 05:08 PM

I could well be wrong BUT I thought the only size difference between the 7 1/2 inch and 7 inch was the mounting and case at the front. The output flanges are both the same size on the bolt on types and I thought they were same distance apart on both. so shafts should be the same...

Paul

NB as I said I could be wrong....

darrens - 9/9/07 at 06:33 PM

nay lad, 7 1/2" diff (granada) has larger flanges. The diff width is exactly the same i.e distance between flanges.

I know cos I have one sat in my garage

Bacon2002 - 9/9/07 at 07:11 PM

darrens,
When your next in your garage could you measure the diameter of the flanges on your differential/drive shafts.
That way I can check if my Sierra ones are the same.
Many thanks,
David

darrens - 9/9/07 at 09:10 PM

quote:
Originally posted by Bacon2002
darrens,
When your next in your garage could you measure the diameter of the flanges on your differential/drive shafts.
That way I can check if my Sierra ones are the same.
Many thanks,

David



Rate then, I had forgot a few things, flanges are 108mm (standard LSD sierra being 95mm ish)but have a read of this http://www.locostbuilders.co.uk/viewthread.php?tid=30267&page=&contribmessage=none

specifically page 2

Cheers


[Edited on 9/9/07 by darrens]

[Edited on 9/9/07 by darrens]

[Edited on 9/9/07 by darrens]

[Edited on 9/9/07 by darrens]

Bacon2002 - 9/9/07 at 09:41 PM

darrens,

That link is really helpful, if not a bit confusing.

I am thinking that since my 7.5" diff has 100mm flanges (and drive shaft flanges) then all I need to do is replace the diff with a 7" one that has 100mm flanges and I should be able to use my existing drive shafts/hubs etc.?

So basically I need a 7" diff with 100mm bolton flanges.

Or am I miss understanding?

Thanks,

David

darrens - 9/9/07 at 10:49 PM

quote:
Originally posted by Bacon2002
darrens,

That link is really helpful, if not a bit confusing.

I am thinking that since my 7.5" diff has 100mm flanges (and drive shaft flanges) then all I need to do is replace the diff with a 7" one that has 100mm flanges and I should be able to use my existing drive shafts/hubs etc.?

So basically I need a 7" diff with 100mm bolton flanges.

Or am I miss understanding?

Thanks,

David


correct!!

I got a set of half shafts machined with smaller flanges to fit my 7.5" diff and thus fitmy sierra driveshafts (only because I wanted to keep the granada lsd)

cheers

Bacon2002 - 10/9/07 at 09:55 AM

darrens,

Thanks very much for you help.

Much appreciated.

David

Paul (Notts) - 10/9/07 at 04:43 PM

darrens

Got a 7 LSD diff in the garage and two 71/2 inc diffs all three have the same size output flanges....................

Paul