I've got a 2.0l 1997 Sport. Diff is on it's way out - it's a 3.9 ratio.

As a replacement I;ve got a 3.9 diff off a 1.8GL Wagon, but the diff casing is diferent - generally looks the same size etc, but nevertheless a diferent casing.

Can anyone tell me if this will be any good for me, or does a diferent diff casing signify that it won't fit on my sport?

Thanks in anticipation