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Ask go-west.. Your Own Question
go-west.., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1226
Experience:  Technican with 20 years experience focused on engines and electrical.
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Customer: I have an Allison MD3060 transmission serial #(###) ###-####in a 2003 Peterbuilt refuse truck. It felt like it was slipping(high RPM to get into 4th) from 3rd to 4th for a few days and then one day it only allowed me to use 2nd gear and now it won't go into any gear from N and the dash check trans light is on
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Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  go-west.. replied 1 year ago.
good afternoon looks like there is a clutch pack issue with you transmission and it will have to go in for service when these transmissions start to act up ie clutch slipping. then it locks the operator out to protect itself..standard operation for allison trannys.. let me know if you have any other questions
Customer: replied 1 year ago.
The diagnostic code was d14627 and that is the A-HI solenoid per a code sheet I looked up, is that what would be causing the issue? If so where is it and can I replace it myself?
Expert:  go-west.. replied 1 year ago.
That solenoid is internal to the trans and the valve body would have to be dropped down. Meticulous job and I don't recommend doing. Suggest going to a shop