A Tale of Two Diffies
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Well, here goes. My XP sedan has an XP ute diff and hubs alround, hence 5 stud. Diff is 4.11, too steep for country driving. Difflap in Brisbane said they had a 3.23 gear set for it. They pulled mine apart to find mine has a long spline (ofcourse theirs was short spline). So I tracked down another diff in Gladstone, friend picked it up brought it to Hervey Bay. Took it to Difflap to move the 5 stud axles into it. Trouble is the backing plates have a different stud pattern. So, take the 3.23 gear set out of the donor diff and put then into the original ute diff. Luck would have it that the donor diff is long spline.
So, who know about this short/long spline thing? When did Ford change?
Boy, talk about a lot of mucking around and money!
As Greg said if it was cheap and easy, everyone would do it!
Merry Christmas All........
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If it's a goin' Ford, it's a goin' thing! 
1965 XP Falcon, 250 cross-flow, 276 hp @ fly, 309 ft/lbs torque, headers, 2 1/2" system, Holley 570 Avenger series, power assisted front disc brakes, 17"x7" alloy Showwheels, Federal 959 RS-R semi-slicks, 8" LSD, Koni heavy shocks, lowered 3", modified LCA's to get -3 camber, +3 castor, oversize front sway bar, floor shift, full cage, OMP race seat. 
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