I bought a 3.38 sierra diesel diff from MNR and am toying with putting quaife internals in. What size are they classed as: 6 1/2 inch (usually associated with 4x4's), 7 inch, 7 1/2 inch (usually associated with cosworths) or 9 inch (whoa there big fella!!!)?

Have been ill over the last few months so building has stopped, but I'm back on it, hope to have it ready for SVA'ing in the next couple of months. By the way Howlor, if you're reading this, your car looks the dogs choddies, fancy a breakfast at the Redbeck so you can show her of to me?

Majority are 7". 7.5" as you say were RWD Cosworth and some Scorpios.

The larger diffs were Ford Motorsport special builds.

Out of interest why are you looking to put Quaife bits in?

Rgds

Rich

[Edited on 2/8/06 by RichieC]

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Out of interest why are you looking to put Quaife bits in?

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Sierra diffs are generally very reliable things, unless the car it came from had a massive mileage on it Id be pretty content it was fine.

I certainly wouldnt be shelling out for quaife internals. If you have doubts about the internals, its a very easy job to pop the cover off and have a look, any damage is easy to spot.

Im running a 3.62 LSD. Not sure if I misunderstood your post but it wont be a worn diff which is preventing you from getting the tail out and generally buggering about - you need an LSD to do it properly.

Rgds

Rich

[Edited on 3/8/06 by RichieC]

Richie

Thats why he wants quaiffe lsd internals..

I am using the 3.62 Cossie myself, but the 3.38 7inch with quaiffe internals and those lightweight half shafts will be much lighter...



[Edited on 3/8/06 by G.Man]

6.5" = front diffs form 4x4's (completly different)

9" = motorsport (completly different)

7" = normal, in rear of most sierras and all 4x4's

7.5" = cossies (and some later DOHC & Zetecs)

Your will be either a 7" or 7.5"

the easy way to tell is from the front/ top mounting:

if it has tapped holes like the bottom ones its a 7.5"

if it has plain holes and a long through bolt its a 7"

See FSOC: http://forum.fordsierraclub.co.uk/viewtopic.php?t=5843&highlight=diffs

the easy way is too measure it!!!!

isnt it???


if its 7 then its a 7 and so on??

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Originally posted by mcerd1
6.5" = front diffs form 4x4's (completly different)


7.5" = cossies (and some later DOHC & Zetecs)

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Originally posted by G.Man
Richie

Thats why he wants quaiffe lsd internals..

I am using the 3.62 Cossie myself, but the 3.38 7inch with quaiffe internals and those lightweight half shafts will be much lighter...



[Edited on 3/8/06 by G.Man]

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I know i am adding this post well after the interest has gone however it may help. 3.38 will be a 7" diff and the easier/cheaper option is to find a 3.6 LSD from a 2.8 sierra or a 3.9 from a DOHC 4x4 and take your crown wheel and pinion out and replace it with your 3.38. May need setting up by some one that knows diffs but will be loads cheaper than a Quaife

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Originally posted by snapper
I know i am adding this post well after the interest has gone however it may help. 3.38 will be a 7" diff and the easier/cheaper option is to find a 3.6 LSD from a 2.8 sierra or a 3.9 from a DOHC 4x4 and take your crown wheel and pinion out and replace it with your 3.38. May need setting up by some one that knows diffs but will be loads cheaper than a Quaife

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Thanks for the info fellas, it's much appreciated. 7" it is then (but don't tell our lass!!). After talking to Marc at the Harrogate show, I think I'm gonna just build it as is and upgrade through winter. Not keen on the Ford LSD idea, I've heard from people in the know that they are hit and miss at best and better to splash out the extra and fit a Quaife.

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Originally posted by Daft Lad Picko
Thanks for the info fellas, it's much appreciated. 7" it is then (but don't tell our lass!!). After talking to Marc at the Harrogate show, I think I'm gonna just build it as is and upgrade through winter. Not keen on the Ford LSD idea, I've heard from people in the know that they are hit and miss at best and better to splash out the extra and fit a Quaife.

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