Pinion Depth ? (ford Gearset)

sn95gt19 · 04-10-2002, 11:54 AM

I NEED TO KNOW WHAT THE PINION DEPTH IS SUPPOSED TO BE WITH A FORD MOTORSPORT 3.73 GEAR. I BOUGHT THE GEAR USED AND DONT HAVE IT. BY PINION DEPTH I MEAN FROM THE CENTER OF THE RING GEAR TO THE FACE OF THE PINION GEAR. IF ANY0NE HAS ANY INPUT IT WOULD BE GREATLY APPRECIATED. THANKS

Jeff Chambers · 04-11-2002, 06:39 AM

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.

jimberg · 04-11-2002, 08:01 AM

I've found that what Jeff says is true. I used the same spacer and it works great. If you've had non-Ford gears in there, then I can probably tell you how to do it later tonight when I find an article on the subject. In the mean time, measure the head of the pinion gear. That measurement will be needed to calculate the pinion depth.

sn95gt19 · 04-11-2002, 10:44 AM

thanks ill try putting the gear in with the shims that were already in there and hope it all comes out ok, it is a ford gear so im hoping the original shim will work ok.

04-10-2002, 11:54 AM	#1
sn95gt19 motors done......woohooo Join Date: Mar 2002 Posts: 799	Pinion Depth ? (ford Gearset) I NEED TO KNOW WHAT THE PINION DEPTH IS SUPPOSED TO BE WITH A FORD MOTORSPORT 3.73 GEAR. I BOUGHT THE GEAR USED AND DONT HAVE IT. BY PINION DEPTH I MEAN FROM THE CENTER OF THE RING GEAR TO THE FACE OF THE PINION GEAR. IF ANY0NE HAS ANY INPUT IT WOULD BE GREATLY APPRECIATED. THANKS

04-11-2002, 06:39 AM	#2
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	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. __________________ 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!"

04-11-2002, 08:01 AM	#3
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	I've found that what Jeff says is true. I used the same spacer and it works great. If you've had non-Ford gears in there, then I can probably tell you how to do it later tonight when I find an article on the subject. In the mean time, measure the head of the pinion gear. That measurement will be needed to calculate the pinion depth. __________________ 351W 89 Mustang GT Convertible Last edited by jimberg; 04-11-2002 at 10:51 AM..

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04-11-2002, 10:44 AM	#4
sn95gt19 motors done......woohooo Join Date: Mar 2002 Posts: 799	thanks ill try putting the gear in with the shims that were already in there and hope it all comes out ok, it is a ford gear so im hoping the original shim will work ok.