I have a sierra diff that is slightly smaller than the standard 7",it has the same fitting sizes (7"across top but is approx half inch smaller on the n/s case,it also does not accept the standard shafts,a front drive fiesta shaft fits?its a 3.62 open in mint condition but what's it from anyone? Thanks phil

Mk5 RS2000 4x4???

Pictures would help a lot I think in this situation. Otherwise it's gonna be guess work

does it have a tag? I believe the 1600 Sierra's had smaller shafts but the casing was 7"

Would it be a 6.5" diff from a 1.6?

There is a rare 6 ½" diff used with the small engine Sierras
There was also a 1.3 Pinto

Pictures of diff


Smalldiff1


Smalldiff2

Are those even the same diff? they look different.


This a picture of some diffs that you can use to id them

The one on the left is a 7"


diffs

the right hand has an output for bolt ons ignore this,the difference is marked in white paint , standard on right slimmer on left..