We are going to discuss more about the way of reducing the tooth thickness. The gears were changed to 3.55's, but the set up was not well done. The amount of play between the ring and pinion gears is referred to as gear backlash. If I need to have the diff overhauled can anyone recommend a good company? A: Because Detroit Lockers have "backlash" or "slack" between the drive and driven teeth and you will hear this in everyday use going through corners and when going from drive mode to coast mode. One is to enlarge the center distance. I checked the backlash and I have .020 backlash, which I think is too much. you have slop in the spiders (or the locker) and you should have some movement with the backlash. rotational play? I have a vibration from 90 MPH and up. G-man BBQ king. How much play/backlash in diff and halfshafts is normal/acceptable if any? The reality isn’t so simple, as Ian Carr, Managing Director of Drive Line Technologies, explains: there are times when backlash is unacceptable; other times when it does not really have any effect at all; and sometimes when controlled backlash is actually a benefit. Last diff rebuild they did I ended up with 2 chipped teeth off my ring gear.Once again, I MADE SURE to tell them to set the backlash correctly. When the vehicle's driveshaft turns, it rotates the pinion gear. For purposes of measurement and calculation, backlash is defined as the amount by which a tooth space exceeds the thickness of an engaging tooth. The pinion gear intermeshes with and turns the ring gear. I recently purchased a 95 Mustang GT. The latter is much more popular than the former. This is much too large. The ring gear transfers the power through the axle shafts to the tires. You can also use paint instead of blueing compound to set up gear lash. It should be somewhere between .007 and .015. anyway of adjusting the backlash from me landy's diff's. In general, backlash in gears is play between mating teeth. I've pinpointed it to the diff. It is probably a natural reaction to assume that backlash is a bad thing which needs to be designed out of every engineered system. That's just it taking up the slop in the spyders. I have looked in my 'brown bible' and Haynes manual but they only mention a tolerance for the crown wheel and pinion measured with a dial gauge with the diff dismantled. On used bearings it should no higher than 5 inch/pounds. If you have an inch/pound torque wrench this can be set by keeping the drag on the bearings to 10-15 inch/pounds and not more. thx in advance jolly77, Jun 29, 2008 #1. If you pull that out and replaced it with a .029 shim, it might yield a .015 backlash. When replacing the pinion gear shim you may start with a shim measuring .019. There are two ways to produce backlash. May 15, 2012 @ 6:32 am Harry Mac Lean. 6.3 Tooth Thickness and Backlash. Within a differential are two gears, a ring gear and a pinion gear. If using shims: Adding shims on the ring-gear’s smooth side of the carrier moves the ring-gear closer to the pinion, causing the teeth to mesh tighter, decreasing the amount the backlash. Judging by picture #1, you can CLEARLY see half the ring gear teeth arent even in contact with the pinion. A high backlash (too much), is corrected by moving the differential/ring gear closer to the pinion gear. Once pinion depth has been set, a final backlash setting can be achieved by adjusting the location of the differential and ring gear. how much play? 'How to set differential backlash' have 3 comments. I … so it's normal to be able to move a pinion from say from 12 o'clock to 1 o'clock. The other is to reduce the tooth thickness. If you start with that, you may end up with a backlash reading of .021. 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