Allison Transmission
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HD4060 6610056058 will shift out of gear only when it down shift to 1st gear, then nothing; no first, reverse, or any gear. Shutting engine off / pushing forward /reverse on shifter after 20 minutes will finally go into gear, I get code of oil level fault but only when then trans shifts down to first gear. I can shift forward to reverse all day and temperate over 160'F when first started , but after I move and trans shifts up and then down to first again I am stuck again for 20 or more minutes. First response I get is oil level sensor is bad , then why can I run to forward and reverse in first gear all day without code coming on or popping out of gear?