[DK on the road]

Ditto Margie909.

I too have the ZF and the C15 in an 06' (coach 748). I've put about 40k on the coach in the last 2 years. I'm at about 103K right now. The Trans is not silky smooth as your Allison is. This is not a bad thing. Its just different. It feels like someone else is shifting, as a semi truck would, as you accelerate. It starts in 3rd and depending on how hard you try to accelerate it skips to 5 then 7 and generally goes sequential after that. It is a Standard transmission for all intents and purpose. It won't get hot as a Torque converter Trans, because it has a electric clutch with straight cut gears.

Note; On a uphill, off ramp stop, pulling a trailer, and after you have stopped, when you take your foot off the brake and touch the throttle, do not hesitate. It will release the brake and roll backwards if your not deliberate about starting out.

I've only used 1st gear when the highway has a traffic jam and we are crawling up hill ( a regular thing on CA highways). it will shift up at walking speed

I pull 6% grades regularly, at about 63K GCW, (Coach plus F150) at about 50 to 52 mph in 11th or maybe 10th gear. 5 % at 55 to 57mph.

My opinion, the air compressor should not be coming on sooner that 40 minutes per cycle, with no activity inside.

I know that Newell did a recall on the rivets on the side. They perform that in about and hour when you stop in there. I'm sure Newell Service can tell you what service has or has not been done. You will need the Coach number for that call.

Good luck and send pictures of the coach if you can.