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Author Topic:   9" Ford Setup Problems - pinion depth
wrenchjockey
Member
posted March 17, 2003 07:38 PM
Okay, here's a good one. I'm having a pinion depth problem setting up the gears. It's a full spool with 6.50 gears. The pinion depth stamped on the end of the pinion is 1.024" (from end face of pinion to the centerline of the spool). The problem is, when I get the ring and pinion in there, with about .008" backlash, the pinion depth is 1.073" with no shims between the pinion flange and the carrier.

The guys at the local rear end shop (not full time race, but they do the odd race rear end) told me to stick a .016" shim between the flange and the carrier, set the backlash at .008" and go racing. Wouldn't that bring my pinion depth out to 1.089" ?? Or am I cracked in the skull once too many?? The pinion is already .049" too far away from the centerline of the spool.

So do I shim between the rear pinion bearing and the pinion to gain back the .049" and go from there, or do I do like the guy said and set the backlash, paint the gears, check the pattern and bolt 'er in?

doug demoss
Member
posted March 18, 2003 08:23 AM
Give me a call at our shop 515-232-0126.I can help you over the phone .thanks


driver27
Member
posted March 18, 2003 01:06 PM
Where are you measuring pinion depth on the carrier. You cannot measure by laying an edge arcoss where the carrier bearings go, and measuing down to the top of the pinion, it looks like it should be half the distance , but in actuallity, it is not. It takes a specific fixture to mount in the caffier bearing halfs to center things up and take a proper measurement. Many a 9 inch ruined by that mistake. For what its worth, when i called the tech guy at Richmond, he after much hem haying said the same basic thing about a .016 shim and setting backlash.


driver27
Member
posted March 18, 2003 01:09 PM
Where are you measuring pinion depth on the carrier. You cannot measure by laying an edge arcoss where the carrier bearings go, and measuing down to the top of the pinion, it looks like it should be half the distance , but in actuallity, it is not. It takes a specific fixture to mount in the caffier bearing halfs to center things up and take a proper measurement. Many a 9 inch ruined by that mistake. For what its worth, when i called the tech guy at Richmond, he after much hem haying said the same basic thing about a .016 shim and setting backlash.


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