| ericjeeper, I suspect you have a switch problem also. When its intermittent like that have the tech read the codes in the computer. Late model Allison's don't have a NSBU switch I"m told. It that case its another problem entirely. Once I had an AT rebuilt while traveling, at an AMCO shop. They did an excellent job, before I left the shop manager said the AT was a pint low and to leave it that way. He said years of experience had proven to him that AT's that were used in extreme conditions, like police cars, ambulances, motor homes, etc. experienced over-full fluid levels. This is much harder on an AT than thought possible. They had been running these vehicles a pint low for several years without problems. GM issued a TSB for the NSBU switch, it may be viewed diesel-central.com. Scroll to the bottom of the TSB page for GM. Click on the lower TSB link.
Last edited by Ray,IN : 06-08-2006 at 08:10 PM.
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