westy turbo
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| posted on 14/1/09 at 02:38 PM |
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Most narrow 7" diff for cossie 2wd
Is it the 3.92? i thought that was a 4.42 or something...
[Edited on 14/1/09 by westy turbo]
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alistairolsen
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| posted on 14/1/09 at 02:42 PM |
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I think you get a 4.27, been some on ebay recently. They might be 6.5 inch tho if they were on 1300s and stuff.
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westy turbo
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| posted on 14/1/09 at 02:45 PM |
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Hey Miger ! thanks for the info!
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mookaloid
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| posted on 14/1/09 at 02:46 PM |
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I'm sure 3.92 is the lowest 7" commonly available - although I believe quaife or someone make a 4.44 or something like it for a few grand!
If you go to 7.5" you can get lower ratios like 4.42 I believe.
Cheers
mark
"That thing you're thinking - it wont be that."
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westy turbo
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| posted on 14/1/09 at 02:48 PM |
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So the 7.5 is a straight swap?
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mookaloid
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| posted on 14/1/09 at 02:52 PM |
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The case is altogether bigger although you could mod your chassis to fit one.
You might be able to make up some hybrid shafts as I'm not sure the flanges are the same.
I know some sierras use the 7.5" diff and I understand people have used them in Indys etc
"That thing you're thinking - it wont be that."
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mcerd1
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| posted on 14/1/09 at 03:02 PM |
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7.5" has a bigger/wider casing (has a different rear beam when fitted to the sierra)
the 4.09 and 4.27 ratio 7.5" diffs are found in 2.0 8v and 16v scorpio's (the ugly bug-eye ones 95-98) these have 100mm bolt-on CV's
(the same as the 4x4 sierra's etc)
but the shaft lengths might be different :?
this lot make 3.14, 4.1, 4.44 and 4.7 ratio's for 7" click
raceline sell them: click
[Edited on 14/1/09 by mcerd1]
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alistairolsen
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| posted on 14/1/09 at 03:10 PM |
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http://cgi.ebay.co.uk/ford-sierra-rear-diff-4-27-1-rare_W0QQitemZ180317213838QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item18031721383
8&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A13|39%3A1|240%3A1318
looking at that it looks like a 7.5 inch case.
sorry
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westy turbo
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| posted on 14/1/09 at 07:28 PM |
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Thank you all for your help!
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NS Dev
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| posted on 14/1/09 at 07:40 PM |
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just to second post about raceline (they are not the only suppliers, SBD used to do them too)
many alternative 7" sierra CWP's are available, just depends on your budget as they ain't std ford ones!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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NS Dev
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| posted on 14/1/09 at 07:44 PM |
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PS if you have an LET how can you use much over a 3.9:1 anyway????????????????????????????
We have an RWD opel kadett with LET making around 375hp and in that car which weighs around 800kg with 3.4:1 diff and it still lights up yokohama
A048R tyres instantly in every gear no matter how gentle you try to be......we're currently trying to map some boost progression into it using a
proper ECU instead of the Bosch Motronic!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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westy turbo
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| posted on 14/1/09 at 08:28 PM |
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For mine i have a 3.62 and a 3.92 will be on MBE 967E and a AVCR will do the rest,the diff that was asking is for my friends 3door sierra cossie,that
sees quite often some drift events
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Liam
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| posted on 14/1/09 at 08:42 PM |
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Unless it's been changed at some point, a 2WD cossie has a 7.5" diff anyway. With the larger CV joint flanges, too.
Liam
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westy turbo
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| posted on 14/1/09 at 08:48 PM |
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Didnt know that thanks..
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repper
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| posted on 14/1/09 at 08:59 PM |
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if my memory serves right the 7.5 diff in the granarder are not LSD as the cars had T,C in stead i nearly got cort out my sen but i checked it befor
handing over my cash . some pepole are t**ts
a good 2WD 7.5LSD from a cosworth will be about £350 ish
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Liam
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| posted on 14/1/09 at 09:19 PM |
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quote:
Originally posted by westy turbo
Didnt know that thanks..
Yep - standard for a 2WD cossie is 3.64 7.5" LSD with bigger flanges/CV joints than any other models (even the granada 24V cossie has the
standard sized flanges/CVs). So you're drifting buddy can probably pick up a scorpio 4.09 or 4.27 7.5" and use the crownwheel and pinion
in his standard 3.64 LSD.
I only say probably cos I'm not 100% sure if there aren't any silly changes in crownwheel thickness or whatever in these late short ratio
scorp diffs. This is certainly a common trick in 7" diffs to create non standard ratio LSDs, so I see no reason it wouldn't apply to
7.5"s. Just best check it out to be sure.
Liam
[Edited on 14/1/09 by Liam]
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westy turbo
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| posted on 14/1/09 at 09:21 PM |
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Kinda confused now...so was been in a granade as 7.5 non lsd and in cossie 2wd 7.5 with lsd?
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Liam
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| posted on 14/1/09 at 09:25 PM |
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Yeah most grandads have 7.5" non LSD. Only the pre-bugeye 24V cossies have a 7.5" LSD, but then that has standard sized 100mm diameter
flanges/CVs. Your mates 2WD cossie sierra has 7.5" LSD with 108mm flanges/CVs and big fat shafts.
Liam
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westy turbo
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| posted on 14/1/09 at 09:48 PM |
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Cheers Liam
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westy turbo
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| posted on 15/1/09 at 11:44 AM |
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any clue what a 4.44.1 crown pinion on a 7" diff top end speed will be?
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mcerd1
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| posted on 15/1/09 at 11:57 AM |
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quote:
Originally posted by westy turbo
any clue what a 4.44.1 crown pinion on a 7" diff top end speed will be?
here's a gear calc program linky
but remember, your engines only got so much power - gear calc programs just tell you the max speed at max rpm and assumes you've got enough
power to get there
I found this one on google: linky
but I don't know how accurate it is
[Edited on 15/1/09 by mcerd1]
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westy turbo
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| posted on 15/1/09 at 12:10 PM |
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Thanks but doesnt work...
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