Specs for backlash with new gears was .006 to .015. Can't remember finding any used ones under .010 and consider it lucky if I find them .015 or under. On used try for contact center from halfway of the pinion tooth toward the rear of the pinion at hand load. From the undercut part of the ring gear toward the edge of the tooth, get pattern center a little over half way toward the tooth edge. Pattern will get rear close to the tooth edge on some at hand pressure. Some will have a wide pattern and are hard to figure. This is just in the ballpark for used parts. Like someone else posted, new is not a option for most. If you can still get them a main shaft was over $400 or $500 the last I knew. Zach I bought some items from Marty before knowing they probably wasn't described real accurate. Lucked out until the last time I bought a ring and pinion for a 340. When they arrived my wife could tell they were junk. Looked worse than the ones you removed. Didn't get mad because I was dumb enough to chance it knowing all his descriptions for all items couldn't be accurate. Saw some items he has since that I would bid on if he wasn't the seller.
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