I just looked at a dealers brochure for 1981 ZXs and saw diff ratios that are not the same for the "Deluxe and GL" models. The D is 3:545 and the GL is the usual 3:90 that many of us have put in to upgrade our 240s. Could people be getting stiffed here ? I don;t have any info for the other years (82-3) that are other candidates for 3:90 diff. I can't find any production numbers for these models either. The GL model came with power steering and you should look for that to make sure you're getting the right diff.