Possible Allison Transmission overfill
I have a 2006 Tiffin Phaeton C7 Cat with Allison Transmission. I had the filters and fluid changed about 1500 miles ago. I noticed the fluid seemed to go to the top of the stick (above the cold level ...
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You said it was right at the top full mark when at operating temps. That means no problem. You cannot judge by the cold level.
