Rear End

[Guest docter fox]

Over winter I want to change to a 3.9 diff, and would also like discs on the back (before i go and buy stupid looking plastic things )

 

so by reading up on it, it would be easier to change the diff, driveshafts and disks rather than trying to mix and match, would it make it easier to change the trailing arms aswell?

 

so what am i looking for? the complete rear end of a 2.0 injection sierra? (3.9 with disks?)

 

also, whats the correct angle for the brake compensator valve in a hood?

[Guest salty_monk]

Yes, it's just as easy to fit the whole set although it's hard to come by a 3.9 setup with disks. You can make disks fit the standard 3.9 diff, see the northwest site build tips for details.

 

As far as the compensator valve goes... chuck it away!

If you really feel you need one either buy an adjustable valve or adapt a mini one, there was a good post on here about that the other week.

[Guest docter fox]

dang, I thought the injection sierra's came with both on the NW site it says i either need a 1.6 estate (with drums?) a 5 speed 1.8 (cvh or pinto?) or a 2.0 efi manual (do they not come with rear disks?)

 

I had the car on a brake tester and the rear was quite poor I can lock the fronts up easily but the back just doesn't do anything!, I'll try it without the compensator and see what the difference is before I go changing things

[steve in stockport]

on a static brake test ie the car not moving the compensator has no effect on the brakes so if the brakes are poor there will be another reason self adjusters not adjusting, worn linings, air in rear half of brake system or something like that.

 

the compensator has a ball bearing in it which moves in a chamber as the car slows down, this movement restricts the braking force being sent to the rear brakes to stop the rear brakes locking up before the fronts and so avoiding unexpected end swappy i'm sure i was going the other way moments

 

steve

[Guest peter2b2002]

Hi I used a 2ltr efi as my doner, it came with drums at the back, i also fitted the sierra compensator at about 10 degrees, passed the sva easy, now even in the wet the rears don't lock up before the front

cheers Pete2b

[Guest docter fox]

steve, thanks for the explanation I should have said on the road, as I can't even lock the rears in the wet I should probably try bleeding them again as I've taken the drums apart and cleaned them up etc

 

may seem a stupid question but i take it you mean leaning further forward at the top by 10 degrees?

 

which sierra's came with disks then? as converting to discs seems a bit of a faff

[Guest Bazwaz]

Doc,

Is this what you're after.

Barry

http://cgi.ebay.co.uk/ford-sierra-2-84x4-l...1QQcmdZViewItem

[Guest docter fox]

ooh thats exactly what I was thinking, but would it be a 3.62 ratio? is it yours?

[Guest Bazwaz]

No, nowt to do with me, i just happened to see it on e-bay last night.

Barry

[Guest docter fox]

disks and lsd is good, but it's a 3.62 though

 

so now I've gotta decide whether a 3.6 lsd and disks would be better than a regualar 3.9 diff with drums, opinions?

[Guest Battery Bill]

James

as I can't even lock the rears in the wet

 

Why would you want to do that then?

Bin the compensator

[Guest docter fox]

It's like the roll bar, I don't want to use it, but it's nice to know I can

[Guest paul mercer]

I've got a diff out of a k reg 2.0 glsi that i don't need. I think it was a 3.9 but i'll leave it to you to do the research if it's ok.

 

Let me know if you want it.

 

Paul

[Guest docter fox]

Thanks for the offer, I'll look into things and get back to you

[Guest red7]

Hi Doc.

I have just quickly scanned this thread. We both have S7's with solid back axles, don't we? The sierra rear end is totaly different with the Diff attached to the chassis, how are you going to engineer all the sierra bits into your car? If you have a plan I'd like to know as I am unhappy as you know with my axle tramping problem.

 

Steve