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I could go into endless details for why I committed to an Eaton Truetrac differential. It all goes back to an engineering publication my father (who designed propulsion systems for the Navy) read back in 1968. I'll spare you that torture. A truetrac differential runs about $700 to $800 just for the unit itself. That's the tip of the iceberg , because it does not accomodate factory style C-clip axle retainment. You are forced to modify the axle with C-clip eliminators or 9" bolt on style end housings. I am currently updating a "how to" thread on building a fully streetable axle with no compromises; full parking brake, ABS retention, and 4 piston caliper compatibility that will deliver over 1000 ft/lb of torque to the street. It will be the only "how to" on the internet that I can find after 8 months of research. It's not going to come cheap though. I have sunk about $3400 into this axle so far.
I have this same lash issue that makes the clunking noise. I presume it is in fact excess lash between the ring and pinion gears. It clunks in low rpm situations when you tip into throttle.For clarity, what are you doing to assess this play? Is this from rotating the axle or tire? Or is is this from pushing and pulling the axle against the carrier?
If it's from rotation, you could have too much lash between the ring and pinion. This means that your gears weren't shimmed correctly. Usually this results in a big clunk when you tip in and out of the gas pedal while cruising. In this scenario the driveline winds up in different directions between coasting and applying positive torque to the rear axle. When you change directions, the added lash in the rear end allows the gears to slap and you get that clunk sound. This can also be caused by bad u-joints.
I have this same lash issue that makes the clunking noise. I presume it is in fact excess lash between the ring and pinion gears. It clunks in low rpm situations when you tip into throttle.
Well undoubtedly you have your father’s genes of research and development in yourself.
Proving a concept and fabricating a prototype always takes a chunk of money out of your pocket, many times ending as a simply satisfying experience.
Good luck in your project
It has been long time since my last posting and still cant figure out what is wrong with my differential/axles or whatever. I just open the differential, to start I measured the gap between the barrel or spacer and the axles with a feeler gauge. It measures exactly 0.25mm or bit under 0.010".Although I have no idea what it supposed to be because I can't find that specification from Eaton or Detroit but it don't seem to be too excessive for me.Excellent and helpful information you shared. Thank you much
Awesome!!!!! Mine like I say no whining no other noises, only that axles noise but I'm getting to a point starting to believe it is normal. the oil is nice and clean without metal dust or shavings I just bolted the cover and will wait overnight to fill it with fresh gear oilI'll update as well. Been running the car for 6 months. Absolutely no noises or monkey business. Runs perfect.