typ17
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| posted on 18/9/10 at 05:00 PM |
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what diff is it?!?
Hi,
Just took a diff out of a 93 sierra with a 2.0 engine.
The serial on it is 85GG 4025 CB and I can't find any reference to this number...
Not even sure if it is a 7" or a 7,5"...
It has bolt on shafts and rear solid disks.
Any clues on what it might be?
Thanks for the help.
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spiderman01980
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| posted on 18/9/10 at 05:06 PM |
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linky
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jacko
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| posted on 18/9/10 at 05:07 PM |
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The one on the right is a 7.5 diff
 
diffs
Jacko
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typ17
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| posted on 18/9/10 at 05:11 PM |
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it's a 7.5 then...
thanks
any clues on the ratio?
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jacko
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| posted on 18/9/10 at 05:14 PM |
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This may help you
 
no2
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minitici
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| posted on 18/9/10 at 06:00 PM |
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quote:
Originally posted by typ17
Hi,
Just took a diff out of a 93 sierra with a 2.0 engine.
The serial on it is 85GG 4025 CB and I can't find any reference to this number...
I think you are looking at the casting number on the case rather than the serial number which should be on a tag on one of the bolts holding on the
rear cover.
Not even sure if it is a 7" or a 7,5"...
It has bolt on shafts and rear solid disks.
Any clues on what it might be?
Thanks for the help.
I think you are looking at the casting number on the case rather than the serial number which should be on a tag on one of the bolts holding on the
rear cover.
[Edited on 18/9/10 by minitici]
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big_wasa
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| posted on 18/9/10 at 06:12 PM |
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I will take a bet at 3.91 
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snapper
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| posted on 18/9/10 at 06:58 PM |
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I'll take the bet as I think it will be a 3.64
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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Dusty
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| posted on 18/9/10 at 07:31 PM |
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You can remove the backplate. Empty oil. Give each bolt head a sharp tap with a hammer first (steel in ally corrosion). Diff ratio will be written on
gear. You can see if it's a viscous diff. I vote 3.62.
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Chippy
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| posted on 18/9/10 at 10:09 PM |
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Being as it's a 93 jobby, it will almost certainly be a 2 Ltr DOHC, so I go for a 3.91, but could be wrong,  Cheers Ray
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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typ17
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| posted on 19/9/10 at 11:13 PM |
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hi,
been out over the weekend.
minitici you were right I was looking at the case casting numer.
It is a 7.5" for sure.
There is a plate on a bolt that has the following:
89GG AA 391
4A OM18
I will open it tomorrow and see who was right
Cheers
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Dan.
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| posted on 20/9/10 at 01:27 AM |
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quote:
Originally posted by typ17
hi,
been out over the weekend.
minitici you were right I was looking at the case casting numer.
It is a 7.5" for sure.
There is a plate on a bolt that has the following:
89GG AA 391
4A OM18
I will open it tomorrow and see who was right
Cheers
Providing the plats has no been swapped its a 3.91:1
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typ17
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| posted on 20/9/10 at 05:10 PM |
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Finally open.
It's a 3,91...
That will give me 113mph top speed according to ther Gear Calc on the BEC sub Forum.
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seventhheaven
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| posted on 2/12/10 at 12:58 PM |
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Sierra Diff
Hi,
A friendly man at the local ford dealer let me use his microfiche machine and I've managed to get all the part numbers, FINIS numbers, exploded
diagrams etc for Sierra, Granada and Scorpios. I'm putting together everything I've found
atwww.super7thheaven.co.uk
Hope that helps - It's a work in progress
4wd 3.9 Rover V8 Locost 7 - Super 7th Heaven
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phelix
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| posted on 11/12/10 at 09:09 AM |
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Any tips on removing the back plate? Seems v well stuck on.
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phelix
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| posted on 11/12/10 at 05:20 PM |
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Never mind; just kept whacking it with a lump of wood (after removing all of the bolts!) and it eventually popped off.
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norm007
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| posted on 4/1/11 at 11:51 AM |
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Providing the plats has no been swapped its a 3.91:1
Also the "AA" shows thats its a LSD as well
Something about this, so very wrong.....I have to laugh out loud, I wish I didn`t like this!!!!!!!!!!!!!!
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