07 classic transmission problems

[divemonster]

Hey guys. I was on my way home and all of a sudden the engine would start to Rev and was like truck went to neutral. Throwing codes
P0751
P0761
P0762
P0877
P0700
Any ideas?

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[divemonster]

There is also trans fluid all under the bottom of the truck and on the tailgate

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[NC-smokinlmm]

P700 is the you killed your Allison code. Check to see where the fluid came from, you could have just lost fluid thru a bad trans line and that would cause those codes. Call me today and I'll help you figure out what's going on buddy...