mcg
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| posted on 9/6/10 at 11:07 AM |
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Sierra Rear Axel
Hi again! I am just sourcing the rear axel assembly for my F27 project. I know that any sierra (except estate) will be fine. So its only a question of
ratio, and brake type.
What ratio is ideal, which should be steered clear of, and which should be satisfactory?
I have the choice between disc brake set up or drums. Cost is king on this project for both build, and once it is finished and used for track days. I
am thinking of going for the drum option as is 60quid cheaper, plus (I believe) cheaper to replace parts, plus the handbrake is easier to use?
Obviously aesthetics is another question!...either way, any advice would be much appreciated!
Thanks is advance.
Matt
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James
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| posted on 9/6/10 at 11:11 AM |
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Does the F27 use the horrendous beam axle mechanism from the Sierra? If not, then you can also use an estate as the diff is the same on all the
Sierras.
If it (F27) does use the whole system then I'll shut up! 
Oh, and the ratio you want will depend on what engine and what gearbox ratios you intend to use.
Cheers,
James
[Edited on 9/6/10 by James]
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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matt_gsxr
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| posted on 9/6/10 at 11:11 AM |
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Drum braked rear:
Push in driveshafts with tripodes
Drum brakes (you knew that) but can use standard brackets to add disks
Lighter weight hub bearing carrier (good)
Lighterweight driveshafts
Tripode joints more messy to split (you have to cut up the beanz can bits)
Disk braked:
Bolt on driveshafts with CV joints
Disk brakes as standard (that don't fit under 13inch wheels)
Heavier bearings carrier
Some diffs are LSD (no LSD's used push in shafts)
Go drums if you want lightweight and aren't a slave to the bling of rear disks.
Matt
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mcerd1
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| posted on 9/6/10 at 11:14 AM |
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re: diff ratio
what engine are you using ?
what gearbox are you using ?
what size tyres will you have ?
do you want it to be screeming its head off at 70mph in top gear or something a bit more relaxed ?
as for the brakes I think you've kind of answered your own question
and as above the added bonus of drums is the weigh and you can get a conversion kit if you want discs later
the only downside of the rear drums is you won't be able to just swap the diff for a ford LSD one - atleast not without custom shafts
(the ford LSD's only come with 'bolt-on' driveshafts)
aftermarket LSD's will fit either kind though
[Edited on 9/6/2010 by mcerd1]
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mcg
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| posted on 9/6/10 at 11:46 AM |
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Awsome thanks for the replies.
Vauxhall 8v engine with fireblade carbs.
Type 9 five speed gearbox.
Planning on putting 15" wheels with 40 or 45 profile tyre. (One place for a slight compromise on aesthetics!)
I dont think the engine will be leggy enough to be doing much on long straights on circuits - I'd imagine that the car will be more fun on
smaller tighter circuits. Deffinitly not looking for a relaxed drive as it will be a track only car.
Double wish bone set up on the rear.
Just found out the guy who has the rear axels I have been looking at only has discs available. One with a 3.62 ratio, and the other with 3.92. £170
all in.
What do ya think? Cheers again.
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mcerd1
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| posted on 9/6/10 at 12:05 PM |
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£170 for a rear axle  a few years back I got 2 whole cars for less than £60 the pair (no MOT's)
if its a doulble wishbone rear then why can't you use the estate bits ? or even granada/scorpio bits ?
I know some chassis can't use the larger 7.5" diff, but these were fitted on all kinds of sierra's and granada's not just
estates
also download this and have a play with the ratio's / tyre sizes: http://locost7.info/gearcalc.php
just bear in mind the top speeds quotes assume your engine has unlimited power 
better to look at the bit that gives you revs in each gear/speed and make your mind up from that
[Edited on 9/6/2010 by mcerd1]
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Bluemoon
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| posted on 9/6/10 at 12:20 PM |
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Not sure about the estate bit either I used one.. No different from the others???
Didto getting a whole car, seems lots running around still in london so they are out there...
Dan
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madteg
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| posted on 9/6/10 at 12:43 PM |
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I have got a coswoth rear axle you can have for 150 quid
3.62 7" LSD
driveshafts
hub carriers
rear beam
vented discs but no calipers
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mcg
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| posted on 9/6/10 at 01:05 PM |
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This would be awsome!! I will U2U you now!
Thanks a million!
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mcerd1
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| posted on 9/6/10 at 01:25 PM |
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where abouts in the country are you ?
btw - I've got some recon solid disc type calipers for sale at the moment - no carriers and the won't fit the cossie hubs - but the normal
hubs they fit will work with the cossie 4x4 shafts/diff
(in other words you can mix and match a bit to end up with an XR4x4 spec rear axle instead of a cossie 4x4 one)
[Edited on 9/6/2010 by mcerd1]
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mcg
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| posted on 9/6/10 at 01:35 PM |
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Based in Brackley (down the road from Northampton) not quite next door to where you are! Not passing this way anytime soon are you?!?
Its a good point though - I need to be sure I can get the right calipers...
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mcerd1
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| posted on 9/6/10 at 02:07 PM |
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quote:
Originally posted by mcg
not quite next door to where you are!
a 680 mile round trip for me - but luckily for you there are hundreds of other builders in your part of the world...
btw it might be an idea to add you location to your profile - it can help allot especially if your buying and selling on here
as for the calipers these are the kind that suit the cossie 4x4 hubs
linky
there are only 2 kinds of rear caliper - vented or solid
(ones sold as granada parts are offten cheaper)
but I think there are 3 kinds of hubs for rear discs (1- normal sierra & granada, 2- cossie 4x4 & granda, 3- sierra 2wd cossie)
it might be worth waiting till you get the hubs sorted out before you get anything else - that way you can make sure you get the right mix of bits
(I've got hubs, calipers, diff's, etc that I can measure if you want to check sizes and confirm what you've got)
[Edited on 9/6/2010 by mcerd1]
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mcg
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| posted on 9/6/10 at 02:28 PM |
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Done! Thanks for the info.
These calipers seem very decent. So these, plus the parts that madteg have offered (plus new pads) should be all I need I assume?
Does anyone think that cossie calipers and vented discs is a little overkill for the rear end of this car given the modest power that I will be
getting from it, plus the minimal proportion of braking the rears do anyhow...The big plus for this set up is of course the LSD!....hmmmm...
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