romer
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| posted on 25/11/05 at 08:48 PM |
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quick question - diffs
Hi folks - quick question please as in the middle of stripping the sierra back assembly.
It is a 4x4 diff (3.92) and my question is - There is an alloy mounting holding the rear of the diff assembly up to the floor pan. Is that needed when
using the diff in a MAC#1 or MK type chassis or can I bin it?
Cheers
Romer
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JoelP
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| posted on 25/11/05 at 08:50 PM |
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this is debateable. Most leave it off to no ill effect, some argue that it should be used as the diff experiences a torque reaction in two axis. I
wont bother on my next project. 
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romer
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| posted on 25/11/05 at 08:55 PM |
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Ah, right - like most things - no definite answer 
Just wondered if there was a bracket already on the kit chassis for the mounting or not?
Thanks.
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zxrlocost
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| posted on 25/11/05 at 08:59 PM |
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doesnt need it only needs the two big bolts
I thought all 4x4 diffs were 3.62
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JoelP
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| posted on 25/11/05 at 09:10 PM |
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the 2 litre ones are 3.92
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zxrlocost
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| posted on 25/11/05 at 09:14 PM |
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well I never knew that
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romer
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| posted on 25/11/05 at 09:20 PM |
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Yup, this engine was the DOHC unit - sitting here doing nothing if anyone's interested (that's the engine not me!).
OK. It would seem the norm is just to use the two front bolts - will bin the mounting then.
Cheers - catch up later as back to the garage now . . Bbbbrrrrr shiver shiver
Romer
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mark chandler
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| posted on 26/11/05 at 07:51 PM |
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Made a bracket up to locate the rear of my diff. When you feel the weight of the diff, then imagine the twisting forces it seemed a sensible use of a
couple of hours, that's a lot of force on a rough road.
The other benefit is that when you bolt the rear of the diff solidly as well as the front it becomes a component of the chassis making it more rigid
for minimal weight gain.
Is this more of a manufacturing ease/price reduction issue ?
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Liam
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| posted on 6/12/05 at 07:52 PM |
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That rear mount attaches to a big floppy lump of rubber on the sierra so it's not going to be doing a huge amount against torque reactions and
the like. Haven't heard of any failures from people not using it (almost everyone). I can also imagine it being a pain to get your diff in and
out with a bracket on your chassis for the rear mount...
Liam
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Liam
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| posted on 6/12/05 at 07:55 PM |
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quote:
Originally posted by mark chandlerThe other benefit is that when you bolt the rear of the diff solidly as well as the front it becomes a
component of the chassis making it more rigid for minimal weight gain.
Thing is it's not designed to be a structural member. Make it into one in an otherwise wobbly rear end (indy for example) and expect to crack
the diff casing if you're running much power.
Liam
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jolson
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| posted on 6/12/05 at 11:20 PM |
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I had a close look at that mounting point when I stripped my Sierra. You'll notice that the subframe is held on at the front end with those 2
big bolts through into the floorpan. The only other thing that keeps the subassembly located under the car is mount on the back of the diff. So it
is a structural mount, but it doesn't locate the diff in the subframe, but locates the subframe on the car. It can be be safely ignored in a
Seven. In the Caterham DeDion setup, its chopped off, and mine will be going the same way this weekend.
Cheers
John
Cheers
John
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JoelP
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| posted on 8/12/05 at 01:10 PM |
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be cautious how much you remove, as its hollow inside to a certain extent. Probably easy if you remove the cover first. Theres an old thread that
describes the best place to cut it.
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RichieC
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| posted on 10/12/05 at 10:25 PM |
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Aye, dont go mad until you see how thick the back plate is. Im sure Rog wont mind me posting his findings. Check under Differential on the June
build diary here
Rich
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