I know your gonna get the whole jolly axle! Buy it up!
XH XR8 utes got 3.45. Although released as in the XG series, the XR6 was dead in the XH series due to the cost of the new extractor set. The diff was either 3.27 or 3.08:1 for the sixes. The 3.23:1 was gone when the last 3.3 was made in 1993. Some Falcon Outbacks had the EL GT spec HydraTrack 3.45:1 diffs, one of the best cheap pick-ups around. Stronger than a 28 spline 9" limited slip diff, and almost as good as a 31 spline Detriot Locker, they were sold for use in mines.
(Most mines then got rid of them because the door handles and hinges fell off like all XD-XG's. Without a doubt using Cortina TE door handles and neoprene bushes in the hinges has done more to turn people off Falcons than any than any good thing Holden ever did to the Commodore!)
As Gassed250 or Dynoed25Osaid a while back, the issue is the diff centre. Different axle spline counts happened around 1994, so its hard to swap the internals of the BW 78 Salisbury Falcon diff. In 1989, the BW company became BTR, and the diffs started to change. Holden used the same BW diff, and when the Group A and HSV's came out, BTR changed the spec on the four pinion diff to cope with 215 and 235 kilowatt 5.0 and 5.7 V8's.
The 3.08:1 diff is only a 7.625" number, not 7.875" like the 3.27, 3.23 and 3.45:1 diffs. The four pinion centre used was different to the earlier ones on the 3.23 and 2.92/2.77:1 diffs. You need the right centre to fit the right crown wheel, pinion and axles. Becasue of the cahnges made between the XD to the XH, it is simpler to swap the whole diff and brake system over than stuff about with swaping the crown wheel and pinion.
Plus points on the XH ute. It got excellent rack and pinion steering, a costly makeover of the front suspension to a half breed EL/XG front end. This dispensed with the nasty 1960 Falcon XK-based track rod, with its movable track rod bush. It used the rest of the XD back half with only a few changes to the rear beaver pannel and the rust prone rear window. You can also steal most parts off any XD-XF sedan, wagon or ute, and make it fit. For almost 20 years, Ford changes nothing asside from pannels and fittings.
Sadest thing about the XH was that it still has the rather light gauge XD chassis behind the A -pillar. The chassis is pretty strong, but the body can undergo lots of bending under heavy loads. Its just a 3/4 ton utility, not a full one-tonner.
