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Welcome to the Forum. Kerry, don't scare the daylight out of our new member.
I am a home mechanic but I can share some experience with you on item 1. No idea on tranny issues. Others can chime in.
1) You probably have a small leak in Head Gasket. I put up with the problem in my SDL with #14 head for 55K miles. Now is at 331K. I have to add a quart of coolant every 1-2 week. so it is not the end of the world. This is what I did.
a) Change out the thermostat to activate the aux fan from 115C to 110C ( a red one ).
b) Hard wire the Aux fan to high speed with a switch. Turn it on when I have a long climb just as a precaution. It saved my ass and the car when we traveled thru Death Valley and the car over-heated.
c) I fixed the HG using Blue Devil seal. I have not added any coolant for the last 6 months or about 6K miles.
d) I have not been to Death Valley since I fixed the HG so the jury is still out.
2) There is no valves to adjust for the om603. It is self adjusting. Rough start could be due to Glow Plug or fuel injector issues.
4) ABS light could be caused by Over Voltage Protection Relay.
It is unusual for the om603 with 150K to have so many issues.
Good luck.
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