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changing the sapphire diff mount

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Old 01-01-2013, 10:24 AM
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Fil
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Default 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.

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Old 01-01-2013, 12:05 PM
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That bump stop thingy just pulls off from memory so you can get to the bolts.
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Old 01-01-2013, 12:11 PM
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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.
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Old 01-01-2013, 12:20 PM
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cheers for that , will let you know what its like when done
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Old 01-01-2013, 12:38 PM
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When are you doing it.
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Old 01-01-2013, 12:52 PM
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was meant to today, but might not have the time now, but as soon as its dry out
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Old 01-01-2013, 01:55 PM
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As soon as it drys out.... lol you will be waiting a while.
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Old 01-01-2013, 02:02 PM
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what difference will a good diff mount make?
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Old 01-01-2013, 02:39 PM
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Over time the rubber breaks down and goes soft . This causes the diff to move and doesn't drive overly nice
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Old 01-01-2013, 02:54 PM
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Originally Posted by Glenn_ View Post
As soon as it drys out.... lol you will be waiting a while.
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
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Old 01-01-2013, 02:57 PM
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Originally Posted by john-saff View Post
what difference will a good diff mount make?
People rave about them, being one of the best handling mods for a cosworth, so got one for christmas,

msd videos before

and after

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Old 01-01-2013, 03:23 PM
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Ive heard people rate them.Ive seen the vids too.
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Old 01-01-2013, 06:28 PM
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do you need to change anything else. as the added stresses from a harder mount
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Old 01-01-2013, 06:37 PM
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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.
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Old 01-01-2013, 08:22 PM
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Originally Posted by john-saff View Post
what difference will a good diff mount make?
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

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!

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Old 01-01-2013, 08:26 PM
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Originally Posted by martysmartie View Post

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.
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Old 01-01-2013, 08:27 PM
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Originally Posted by Fil View Post
was on about the two bolts that hold the diff mount on to the diff.
Oh, got you

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Old 01-01-2013, 09:05 PM
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My made ​​little difference, more stable when you release the gas after full throttle. Even when cornering feel the rear end more stable.



Regards/Jonas
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Old 01-01-2013, 09:10 PM
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Originally Posted by H15 FSC View Post
do you need to change anything else. as the added stresses from a harder mount
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".

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Old 01-01-2013, 11:27 PM
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Originally Posted by martysmartie View Post
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
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Old 01-01-2013, 11:50 PM
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Wonder what effect welding this solid would have ...lol
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Old 02-01-2013, 08:17 AM
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Properly vibrate like hell through the car.
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Old 02-01-2013, 09:09 AM
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Originally Posted by Rob Virgo View Post
Wonder what effect welding this solid would have ...lol
my supra diff mount is completely solid, not much difference in it tbh.
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Old 02-01-2013, 05:22 PM
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Originally Posted by MalZon View Post
My made ​​little difference, more stable when you release the gas after full throttle. Even when cornering feel the rear end more stable.



Regards/Jonas

Where did you get that mount from mate?


Luciano
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Old 02-01-2013, 06:36 PM
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due to the "unique" way that ford built sierra's, some are easier to change than others

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

they are very easy to change but i'm not sure if you need to loctite the diff bolts back in again
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Old 02-01-2013, 08:33 PM
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Originally Posted by charlie luciano View Post
Where did you get that mount from mate?


Luciano
Matt Lewis @ Ebay

Regards/Jonas
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Old 03-01-2013, 09:20 AM
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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 !!!
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Old 03-01-2013, 11:27 AM
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Originally Posted by charlie luciano View Post
Where did you get that mount from mate?


Luciano
MSD sell them.There about 120 quid.
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Old 05-01-2013, 02:57 PM
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Originally Posted by MalZon View Post
My made ​​little difference, more stable when you release the gas after full throttle. Even when cornering feel the rear end more stable.



Regards/Jonas
x2

cheeRS Carl
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Old 05-01-2013, 03:03 PM
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So are these diff mounts defo worth getting.
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Old 05-01-2013, 03:06 PM
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Originally Posted by Glenn_ View Post
So are these diff mounts defo worth getting.
Yes mate , got one on my quick saph

On there 4 years now
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Old 05-01-2013, 03:46 PM
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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


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.

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from msd
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Old 12-01-2013, 09:55 PM
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Nice one.Have you been out in it then.What is it like??
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Old 13-01-2013, 08:01 PM
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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.
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Old 13-01-2013, 10:15 PM
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Originally Posted by Glenn_ View Post
Nice one.Have you been out in it then.What is it like??
finally got to give it stone stick today. seems to be pretty solid around roundabouts. and less squatting under heard acceleration .
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Old 13-01-2013, 10:35 PM
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Originally Posted by viperz888 View Post
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.
Any arb

.?
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Old 14-01-2013, 09:39 AM
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Rob lookin at is sigg.It isnt a cossie.
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Old 14-01-2013, 09:39 AM
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Originally Posted by Fil View Post
finally got to give it stone stick today. seems to be pretty solid around roundabouts. and less squatting under heard acceleration .
Cool.I got a mount last nite.It looks the same as yours.
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Old 14-01-2013, 11:38 AM
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Originally Posted by Rob Virgo View Post
Any arb

.?
Yeah, it's a glsi, not a cos. Might get one on it one day.
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Old 14-01-2013, 06:28 PM
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Will you not need the suspension arms with the brackets on for the roll bar links.
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