When a diff is referred to as 7 inch or 7.5 inch, what exactly does the measurement refer to??

A guy is supplying me with a full xr4i back end with discs but I think this is a 7.5 inch and I want to make sure I aint gonna have to modify a standard MK chassis as I have ordered it powdercoated.

Dumb question?

Measurement across diff mountings.

Ah, so I need to drop Mk a line and tell them it's that diff so the mountings are spaced correctly?

Its the measurement across the top of the diff,if MK has not made your chassis yet or powder coated it,its not a problem,just ask them to to weld your diff carrier to except the 7.5" diff.

I wish I could type faster

[Edited on 19/05/04 by PAUL FISHER]

And there was me thinking it was the dia of the crown wheel ?

quote:

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Originally posted by big_wasa
And there was me thinking it was the dia of the crown wheel ?

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It's both

If its from an XR4i, or XR4x4, I am pretty sure that it will be a 7" diff, (and possably a LSD). I think that the 7.5 one was only fitted to the Granada. May be wrong but don't think so. Cheers Ray

V6 XR4i diff is 7" non LSD.

Rear brake setup is drums as standard not discs, so if it's got discs fitted they must have fitted a xr4x4 rear end which would mean shafts would be lobro with an LSD. Failing that they've stripped the drums away,added caliper backets and done a disc conversion that way.

Or is this rear end off a 2.0 1990's XR4i ??

[Edited on 6/3/08 by Mr G]