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Sierra/granada 7.5 LSD diff 4.21
craig5 - 7/7/15 at 11:15 AM

The above diff for sale ideal for sprints/hillclimbs in perfect wôrking order £200 :-) so a bargain

wylliezx9r - 7/7/15 at 11:28 AM

Could be interested depending on how easy it is to exchange with a 7" bolt on shaft LSD ?

craig5 - 7/7/15 at 11:38 AM

I've just got to a 7" diff 3.62 it's has p100 connections on for 7" lobros

mcerd1 - 7/7/15 at 11:45 AM

quote:
Originally posted by wylliezx9r
Could be interested depending on how easy it is to exchange with a 7" bolt on shaft LSD ?
depends on the size of your chassis's diff mounts...

some chassis are made wide enough to fit either type (using bigger spacers for the 7" diffs) other chassis may need a bit of work to make the bigger diff fit

the driveshafts may be ok (you'd need to check the lengths anyway) but it really depends on the type of flanges that are fitted to the diff
your current 7" diff should have the 100mm CV joints - the 7.5" can be the same, but Sierra Cossie ones had larger 108mm ones

[Edited on 7/7/2015 by mcerd1]

[Edited on 7/7/2015 by mcerd1]

craig5 - 7/7/15 at 11:48 AM

It's fitted with 100

craig5 - 7/7/15 at 11:50 AM

and no spacers where needed when I swopped over it was straight swop

wylliezx9r - 7/7/15 at 12:26 PM

quote:
Originally posted by craig5
and no spacers where needed when I swopped over it was straight swop


Did you have to modify the prop shaft ?

craig5 - 7/7/15 at 12:36 PM

No nothing just had to locktite everything

wylliezx9r - 7/7/15 at 01:00 PM

So I think I would need new mounts going from 7" to 7.5 " ? Unfortunately I cant find anybody who manufactures them. Does anybody have any ideas ?

craig5 - 7/7/15 at 01:44 PM

New mounts? what are you running now?

craig5 - 7/7/15 at 01:52 PM

http://pages.ebay.com/link/?nav=item.view&alt=web&id=261952785261&globalID=EBAY-GB

craig5 - 7/7/15 at 01:53 PM

If you have 100mm lobros they will fit

wylliezx9r - 7/7/15 at 01:54 PM

quote:
Originally posted by craig5
If you have 100mm lobros they will fit


I have 100mm Lobros, I'm talking about the chassis mounts.

craig5 - 7/7/15 at 01:59 PM

Only diff is 7" u need long bolt and nut and bolt to attach and on the 7.5" u can just use short bolt as the end is threaded

CosKev3 - 7/7/15 at 03:06 PM

Craig your confused!

Most cars don't use a cradle system like yours to hold the diff, the chassis is built for a certain size diff.

so if the chassis is built for a 7 inch diff a 7.5 inch diff will be half an inch to wide to fit between the mounts, so it won't fit without chassis mods (ie cutting off existing mounts and welding in new ones)

If a chassis is built for 7.5 inch diff its easy, you just use spacers to allow a 7 inch diff to be bolted up correctly.

craig5 - 7/7/15 at 03:19 PM

I can feel a group but coming along here then lol as I could replicate my craddle for anyone

mcerd1 - 7/7/15 at 06:43 PM

quote:
Originally posted by craig5
I can feel a group but coming along here then lol as I could replicate my craddle for anyone

^^ I think we need some pics of your setup

craig5 - 7/7/15 at 06:55 PM

mcerd1 - 7/7/15 at 06:56 PM

quote:
Originally posted by CosKev3
so if the chassis is built for a 7 inch diff a 7.5 inch diff will be half an inch to wide to fit between the mounts, so it won't fit without chassis mods (ie cutting off existing mounts and welding in new ones)

If a chassis is built for 7.5 inch diff its easy, you just use spacers to allow a 7 inch diff to be bolted up correctly.

^^ what you say is true, but eh width of the mounts isn't exactly 7" or 7.5" - those numbers only really refer to the size of the crown wheel inside and its more of a coincidence that the mounts widths are approximately the same give or take a few mm
(ie don't go chopping exactly ½" off the mounts and expect it to fit)

craig5 - 7/7/15 at 06:59 PM

didnt have to as front craddle has pre drilled running holes to allow small movement too forwards or backwards

mcerd1 - 7/7/15 at 07:09 PM

^^ most chassis are quite a lot different to yours

the dax rush ones are integral to the chassis with enough room for 7.5" or 7" diffs and don't use the rear mount


the mk indy is like this:


the mnr vortx is like this:


and so on....

CosKev3 - 7/7/15 at 07:22 PM

quote:
Originally posted by mcerd1
quote:
Originally posted by CosKev3
so if the chassis is built for a 7 inch diff a 7.5 inch diff will be half an inch to wide to fit between the mounts, so it won't fit without chassis mods (ie cutting off existing mounts and welding in new ones)

If a chassis is built for 7.5 inch diff its easy, you just use spacers to allow a 7 inch diff to be bolted up correctly.

^^ what you say is true, but eh width of the mounts isn't exactly 7" or 7.5" - those numbers only really refer to the size of the crown wheel inside and its more of a coincidence that the mounts widths are approximately the same give or take a few mm
(ie don't go chopping exactly ½" off the mounts and expect it to fit)]


99% of people on here know that, we weren't talking about someone cutting up a diff, just trying to explain in a easy to understand way why a 7.5inch diff wont fit in a chassis built to take a 7 inch diff.

CosKev3 - 8/7/15 at 07:25 AM

Description
Description

My chassis in the pic above, built for a 7 inch diff so would need new mounts welding in to take a 7.5 inch diff.

craig5 - 9/7/15 at 05:56 PM

Now sold