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Which Diff/Seals


Chris Scott

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So I’ve had a bit of a nightmare - ordered a set of diff seals, popped them on the shelf - months later go to fit them and they are wrong!

Is there any easy way to ascertain what Sierra diff I have? Is it a 6.5, 7 or 7.5? 
 

What does that measurement actually refer to?

Or is it easier to just take the seals to a bearing/seal company and get them to identify/supply them?

Thanks 

Edited by Chris Scott
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Thanks, it’s 100% one long bolt so either 6.5 or 7 - wonder if it’s my mistake as when I checked it says Sierra/Cosworth on my listing - would Cossie be different? 

2 hours ago, richyb66 said:

6.5" and 7" diffs have a single long bolt going from side to side across the top. 7.5" has 2 separate bolts.

The sizes refer to the crownwheel diameter.

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I have replaced the driveshaft and pinion seals, luckily obtaining the correct size. I used the Haynes Sierra manual instructions for fitting, However during the process of Googling as much as I could about the Sierra Differentials I came across the link below, to Super 7th Heaven, which has more information about Sierra differentials than you ever want to know. You may have already found this, but just in case. Depending on what other components you might use on your car there is lots more information on this site.

http://www.super7thheaven.co.uk/components/sierra_rear_differential/

I have downloaded as much as I can of interest from here, in case it all dissapears into the big bit bucket.

 

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