More: I failed to note that 1st, 2nd and 3rd gears on the new gearboxes are also different--they are all lower than the 'standard' gearing, meaning that this new gearbox is an extremely wide-ratio unit, with a lower first (perhaps necessary with the tall ring and pinion) and higher 5th.
I've posted this link here before, but it bears repeating. There is an excellent Excel spreadsheet for ZF gearing on Mike Dailey's PanteraPlace website; once you download it, you can change all the variables (tire size, individual gear ratios, rear end ratios) to see what the speeds will be in each gear, at each RPM. The spreadsheet is actually set up for a six-speed gearbox; simply ignore the right column.
I actually saved it to my computer, then centered the columns so that they lined up under the headers so it made more sense.
Here's the link:
Pantera gearing