My 4060R has a "squeaking" noise during its up shift from 3-4.
Allison service writer said she had heard of such a thing.
Anyone here have any info?
Bob,
Had my 4060R rebuilt 6 years ago due to a failed P3. It had the squeak from 3 to 4 for a long time. My Allison shop listened to and did not have a fix except to say "If it broke, they would fix it". The squeak has gone away and tranny works fine.
Hope this helps.
What trans oil were and are you now using if different?
Bob,
The rebuild included Allison synthetic oil.