changing the sapphire diff mount
 

What have you got to remove? much?

Is it just a case of get the rear on axle stands, then undo the four diff mount bolts and the diff will drop low enough to get the mount undone from the diff?

As currently there is a bump stop in the way of the two bolts going into the diff.

Attachment 178903

That bump stop thingy just pulls off from memory so you can get to the bolts. ;-)

Yeh the bump stop comes off.I would put the car on axle stands then put a jack under the diff.There are 4 13mm bolts and then 2 bolts in the diff casing.

When you do this can you please let me know what the car handles like when you change it.I fancy a posh diff mount for mine.

cheers for that , will let you know what its like when done

When are you doing it.

was meant to today, but might not have the time now, but as soon as its dry out

As soon as it drys out.... lol you will be waiting a while.

what difference will a good diff mount make?

Over time the rubber breaks down and goes soft . This causes the diff to move and doesn't drive overly nice

yep probably, well its dry today, but spent too much time sorting house issues out ( guttering ) so not getting it donw today, sometime over the nest few days hopefully

People rave about them, being one of the best handling mods for a cosworth, so got one for christmas,

msd videos before
and after
:top:

Ive heard people rate them.Ive seen the vids too.

do you need to change anything else. as the added stresses from a harder mount

When I had mine fitted it made a good difference in feeling the power go to the road and felt more together back there. Nice mod although i need the countersunk bolts to miss the roll bar still.

Lots, if you can understand the suspension design then it will make sense, basically the rear beam is like a triangular affair, with this mount forming the top point, if this is sloppy the beam will have play in it, causing a change in the geometry in pretty much all forms of drivibg, coupled to the fact it's going to be knackered by now anyway, imo one of the best mods you can do, I just need to get myself one :cry:

OP, those bolts can be removed with the bump stop in situ, I just used an extension, just make sure you have the diff supported first!

Martin

was on about the two bolts that hold the diff mount on to the diff.

Oh, got you :)

Martin

My made ​​little difference, more stable when you release the gas after full throttle. Even when cornering feel the rear end more stable.

http://www.alive.se/upload/source/1745981.jpg

Regards/Jonas

The mount I believe is CNC machined (original was steel maybe?), only difference I think is the obviously 'poly bush', but I woulden't have thought that makes little if any difference in terms of "NVH".

Martin

ok cool:king:

Wonder what effect welding this solid would have ...lol

Properly vibrate like hell through the car.

my supra diff mount is completely solid, not much difference in it tbh.

Where did you get that mount from mate? ;-)


Luciano

due to the "unique" way that ford built sierra's, some are easier to change than others :cry:

what you want to do is lift the rear of the car up and put some axle stands under the beam

then put a trolley jack under the diff to support it when you undo the bolts

get the arb bolts out first to get it dropped out of the way so you have more clearance

then undo the actual diff bolts, these may be a little tight so you may need big muscles/power bar to shift them

then use at least a 12" extension to undo the 4 13mm bolts and then lower the diff out of the way

the rubber bush/bung thing is there to stop the fuel tank splitting if you are rear ended onto the diff casing and it has been known to be just a little troublesome to remove :cry:

they are very easy to change but i'm not sure if you need to loctite the diff bolts back in again

Matt Lewis @ Ebay

Regards/Jonas

I mentioned welding it solid as a joke but may try it today and fit to track car to try theory as some kits have solid alloy or nylon bushs which are as solid as you'll get, would be a cheapo alternative for a track car if no compliance is ok for location purposes !!!

MSD sell them.There about 120 quid.

x2 :top:

cheeRS Carl

So are these diff mounts defo worth getting.

Yes mate , got one on my quick saph ;-)

On there 4 years now :top:

well just fitted it! bit of a pain but got there,

undone the old mount and removed, the diff then sprung up about 5mm!

Trying to leaver it down and fit the allen bolts into the diffs a pain on your own.


Even more so when you find they are too long after some swearing:wall:


Had a quick search on here, seems common, as ford have a few variations over the years, so you need to chop about 8mm off.

Trying to do the 6mm allen key bolt up is a pain too, as not much fits in there, used a 6mm allen key screwdriver bit an 6mm spanner.

Still its all fitted now, and seems alot firmer, but didnt go for much of a drive.

Attachment 178904

from msd:top:

Nice one.Have you been out in it then.What is it like??

I've got a solid mount on mine. Diff whine is a slightly louder (the car has done over 200k, original diff), but still not too loud, quieter than the exhaust anyway. No vibrations or any other nasties. I didn't have the car very long before I had it on, so can't really compare.
Attachment 178905

finally got to give it stone stick today. seems to be pretty solid around roundabouts. and less squatting under heard acceleration .

Any arb

.?

Rob lookin at is sigg.It isnt a cossie.

Cool.I got a mount last nite.It looks the same as yours.

Yeah, it's a glsi, not a cos. Might get one on it one day.

Will you not need the suspension arms with the brackets on for the roll bar links.