MountainMichael
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8.8 Gear whine reduction - various bandaids; then permanent fix
later edit:
Thread synopsis to save some people some time:
I found various ways to reduce my 8.8's gear whine by about 75%. Much later in the thread you'll see that I subsequently did gear pattern and pinion bearing pre-load diagnostics. I then learned the axle setup was fubar and went ahead and rebuilt it 'cause at that point, there was no question it was just going to continue to get worse.
So the bandaids bought some time, but it was going to keep getting louder and louder due to very poor setup 3.55 gears OEM by Ford.
Back to the original text including some flawed assertions on my part. I've subsequently corrected any mistakes I caught.
Like most of my threads, I've included a lot of detail not knowing the experience level of the people who will read it. If you're not looking for detailed info or if you will be unduly irritated by a long read, suggest you click out now.
There is possibly some good build info in this thread such as the various things I stumbled on. Notably, at least for my specific new set of FRPP 3.73 gears, the FRPP gear pattern chart is ASS BACKWARD for pinion shim adjustment. That wasted a TON of my time.
I admit to forgetting a lot since being away from the trade for some time now.
Micke
Degreed/Cert'd ASE Master Tech (etc) - Retired for 9 years now
Original text, beginning with some things done to attenuate noise before rebuild:
Because this happens so often with OEM stock AND re-geared differentials and because my car had some minor whine that was making me a little crazy, I started a thread over in BITOG.
I'm linking it here because some oil and non oil steps have already yielded improvement; like about 75% reduction overall.
There are various threads here and there in Tech on gear whine, but the loop usually isn't closed. I'm going to follow this topic to the bitter end. Yet I don't think it deserves to be in Tech per se.
The BITOG thread is getting a lot of views and some good input.
fwiw,
Micke
aka 10bears
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2646159#Post2646159
later edit:
Thread synopsis to save some people some time:
I found various ways to reduce my 8.8's gear whine by about 75%. Much later in the thread you'll see that I subsequently did gear pattern and pinion bearing pre-load diagnostics. I then learned the axle setup was fubar and went ahead and rebuilt it 'cause at that point, there was no question it was just going to continue to get worse.
So the bandaids bought some time, but it was going to keep getting louder and louder due to very poor setup 3.55 gears OEM by Ford.
Back to the original text including some flawed assertions on my part. I've subsequently corrected any mistakes I caught.
Like most of my threads, I've included a lot of detail not knowing the experience level of the people who will read it. If you're not looking for detailed info or if you will be unduly irritated by a long read, suggest you click out now.
There is possibly some good build info in this thread such as the various things I stumbled on. Notably, at least for my specific new set of FRPP 3.73 gears, the FRPP gear pattern chart is ASS BACKWARD for pinion shim adjustment. That wasted a TON of my time.
I admit to forgetting a lot since being away from the trade for some time now.
Micke
Degreed/Cert'd ASE Master Tech (etc) - Retired for 9 years now
Original text, beginning with some things done to attenuate noise before rebuild:
Because this happens so often with OEM stock AND re-geared differentials and because my car had some minor whine that was making me a little crazy, I started a thread over in BITOG.
I'm linking it here because some oil and non oil steps have already yielded improvement; like about 75% reduction overall.
There are various threads here and there in Tech on gear whine, but the loop usually isn't closed. I'm going to follow this topic to the bitter end. Yet I don't think it deserves to be in Tech per se.
The BITOG thread is getting a lot of views and some good input.
fwiw,
Micke
aka 10bears
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2646159#Post2646159
Last edited: