I finished rebuilding my original diff. Setting is as follows, original pinion depth shim 1.94mm. Pinion preload 1.3Nm or 11.5inlb. It feels much more tighter than before. I plan to swap the diff in another 2 weeks. In the meantime, I put in half the amount of gear oil and breaking in the pinion bearings everyday by turning the handcrank for 10 minutes. The last rebuild on this diff netted me a 7inlb preload, and when I pulled it off after 2 months and 1000km, the preload was 2.5inlb, which is a loss of 4.5inlb. i suspect the whine at 60 to 70kmh is the "loose" pinion preload. Lets see if the high initlal preload will solve the whine. Even with a preload loss of 5inlb, i should have 7inlb for a very long time.
The backlash remains at 0.18mm average.
Now for the auction diff which is still in my car. I drove around these past weekend, and went up to speeds up to 145kmh. It is smooth at higher speeds, and the vibration at such speeds I had before are now gone, the auction prop shaft solved this problem. Now for the not good, the whine at 60 to 70kmh is there, especially when the oil is hot. It is the diff, as there is a difference in the sound intensity vs my original diff. There is also a whine hum at 35kmh while accelerating.
I suspect maybe the bearings are too old or pinion preload isnt enough. Anyway, i am planning to change the bearings in the auction diff by the coming month to a low mileage used bearing set, and increasing the pinion preload to the same preload I have on my original diff, this will depend on the sound that the original diff makes after testing it. Hope this will finally solve my issues. Will report back at the end of the month.
The backlash remains at 0.18mm average.
Now for the auction diff which is still in my car. I drove around these past weekend, and went up to speeds up to 145kmh. It is smooth at higher speeds, and the vibration at such speeds I had before are now gone, the auction prop shaft solved this problem. Now for the not good, the whine at 60 to 70kmh is there, especially when the oil is hot. It is the diff, as there is a difference in the sound intensity vs my original diff. There is also a whine hum at 35kmh while accelerating.
I suspect maybe the bearings are too old or pinion preload isnt enough. Anyway, i am planning to change the bearings in the auction diff by the coming month to a low mileage used bearing set, and increasing the pinion preload to the same preload I have on my original diff, this will depend on the sound that the original diff makes after testing it. Hope this will finally solve my issues. Will report back at the end of the month.
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