Is this something that can be easily done by myself? Or is it a specialist job?

Also, are the 7" sierra cwp the same in both lsd and non lsd?

easy to do.

You will need a very deep socket for the pinion, I forget the size 36mm maybe I got an impact socket from halfords for £5 then cut the drive end off and welded a bit of 2" tube in to make the correct length.

There is lots of talk about setting up correctly, you can do it yourself with a bit of care. For myself I just got the seal kit, dressed out the crush washer on a bit of rod and tightened the pinion until it all slack was removed and wound the crownwheel bearings into each other until the assemble started to bind then backed off a tad then winding each castelated nut the same amount moved into mesh with the pinion again let it bind slightly then back off a few notches.

On the basis that all parts had already done 100k miles I did not worry about being overly precise, my car is track only so may not suit a road car.

Hardest bit was undoing the castelated end nuts, clean with a wires brush, soak in good penetrating oil for a couple of days then you should be able to unwind with a bit of rod across the end, if you tap with a hammer the lugs fall off, as you can see!

Regards Mark
Rescued attachment Rod on teeth.JPG

Is there any difference in doing it for an lsd?

The crownwheel and pinion are the same LSD or not.

I'm pretty sure the pinion nut isn't a normal nut and needs some sort of special tool (which can be fabricated but it ain't a normal socket).

Also check which way the thread is, they do come both left and right handed.

I'd be cautious reusing the crushable spacer - I had a diff failure due to mine falling apart even though it was a new one. They're only a quid or two form the Ford dealer anyway.

If you wanted to get someone to do it Andy Bates has all the tools, knowledge and experiece, also Austen's (MK9R) dad can do it.

Do you know where these people are based?

Andy Bates (AB Performance) is in Suffolk, user Andy B on here.

Austen is user MK9R on here, his Dad is based in the Midlands.

They've both rebuilt Sierra diffs for me and both did top jobs.

Here i am Cheers Bob

Yeah, do not reuse the crushable washer!! Like bob said, he ate his diff due to the washer failing to bits (for what ever reason). When using a crushable washer you can't tighten it up, then back off quater of a turn as you will then have play in it, it has to be set correctly on the way in first time.

Its not a difficult job to do, but experience and the correct tools make it so much easier

Any idea on cost for doing the work?

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Originally posted by SeanStone
Any idea on cost for doing the work?

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