Excess, heat and damage to expensive parts will likely result. If you pull that out and replaced it with a .029 shim, it might yield a .015 backlash. the stock original axles have 250.000 miles where as the diff has 28.000. There are cases where diff backlash is a problem. Throw in the fact I have a manual which states the backlash range for an 8.8 is .008 to .012, he could be up to .004 high. I am guessing this backlash is coming from the differential, but I really don't know enough about the inside of automatic transmissions to be confident. 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. In short, yes. Rather than trying to change the backlash and preload at the same time, I recommend getting the backlash correct and then adding preload for the final assembly. Now, whether or not it's a big deal is a different story. 6 … Whether it's .001 or .1 over, if you are outside of the tolerance limit, it's too much. I can also replicate this by going under the car and turning the axle by hand, with identical results. To install your ring and pinion gears and/or differential correctly, it is critical to torque your bolts and set your preload and backlash correctly. Backlash: Ring Gear Bolt Torque: Carrier Bearing Cap Bolts : Chrysler 7.25" 12 to 14 in-lbs. There is no noticeable backlash between the wheel and the axle and also no bearing noise. This is much too large. Howdy, I'm new here to the forum and I'm already up with a question....i'm running a 93 4x4 with a relatively new differential from randys ring and pinion, after 28.000 miles there seemes to be excessive backlash between pinion flange and axle....would worn axle splines at the diff- be the cause of this..no noise yet. It should be somewhere between .007 and .015. This part covers the repair and measurement checks for backlash and gear pattern. I don't think it is the trans, the U joints are solid but I can twist the drive shaft 1/2 inch either direction before the backlash is out. forward and reverse, as well as to account for thermal expansion/contraction, and to allow lubricants access to the surfaces. However, once the noise gets bad, rebuilding or replacing the differential may be the best way to fix the noise. Even on a bench with the cover off and rocking the ring gear to check backlash you need to be a little careful. If the carrier has to be moved to set the backlash, it is easier to remove if the preload is not too tight. I am trying to find a clunk I get when coasting in 2nd or 3rd gear. The 87 FSM says backlash on the R200 is .0051" to .0071", and getting the carrier to rock back and forth such a small amount without turning the pinion requires a bit of attention. If you start with that, you may end up with a backlash reading of .021. Excessive Backlash - Causes high amplitudes at GMF and harmonics. 2003 V6 5 speed 120,000 miles. The less loaded the gears are, the more effect the excessive backlash … It is probably a natural reaction to assume that backlash is a bad thing which needs to be designed out of every engineered system. The following table contains the proper specifications for all popular axles. This can cause unexplained frequencies to appear - they may be the resonant frequencies of the gear(s). Under means somebody screwed up during a repair. Over, and we'll have some more noise, and extremely over will also result in damage. When replacing the pinion gear shim you may start with a shim measuring .019. When speaking of gears, backlash is the amount of clearance between mated gear teeth. How to fix a noisy differential: Replacing the differential fluid may stop the sound, or replacing a pinion or side seal may solve the problem. 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