Tough to say. Other manufacturer's etch the pinion depth on the face of the pinion so that the depth can be set up precisely. Ford gears aren't etched since they expect the installer to reuse the original pinion shim; their manufacturing tolerances are close enough that this theoretically gets the pinion within its installation tolerances. If you're replacing non-Ford gears, or have swapped pinion shims somewhere along the way, you've upset their installation scheme. The best you'll be able to do is to set the gears up by pattern alone. Not an easy task to do and get it perfect.
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Jeff Chambers
1990 Mustang GT 10.032 Seconds / 137.5 MPH
14-time Street Warrior World Record Setter
CRT Performance
2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH
2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2
"There's nothing boring about a small block automatic shifting gears at 9400 rpm!"
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