What is the width rim flange to rim flange of a Siera IRS unit?

I take it your talking about a sierra lsd unit?

Is this what you are looking for?


Image deleted by owner

I actually meant when the whole assy is assembled. Diff, driveshafts and hubs.

What is the width from the flange that the RH rim bolts to, to the flange that the LH rim bolts to.

Trying to calculate what lenght of the front wishbones must (442 modified chassis) for the Front track and the Rear track to be the same width.

My Indy is 1520 from hub face to hub face, add onto that the width of the brakes discs.

Haynes say the track is 1468mm, adding to that the standard offset, (2 x 38mm) gives a dimension 1544. This includes the thickness of the discs which in my case are 7mm each at the hub therefore after subtracting the disc measurment the distance between the outer faces of the flanges is 1530mm.

Mick

So

Escort diff - 1400 mm
Siera - 1544 mm
Diff - 144 mm
Every side - 72 mm
+4 Frame - 51 mm
Mod to swing arms - 21 mm

What will 21mm a side narrower front track do to the handling?