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  #41  
Old 02-19-2014, 02:11 PM
TransEngineer TransEngineer is offline
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OK, your previous post said "no R" so I thought it was completely dead.

I suspect you have an inoperative UD clutch. To get 1st gear, you need UD for the input, and either LR or the overrunning clutch (ORC) for the reaction. We know LR works (since Reverse is OK), so apparently UD is bad.

This could be a number of things (blown UD piston seal, defective UD solenoid, cut #1 check ball, broken UD shaft weld, broken rear sun gear, blown UD accumulator piston or seal, etc.). So we need to narrow things down. Any CEL or fault codes?
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  #42  
Old 02-19-2014, 02:15 PM
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Originally Posted by TransEngineer View Post
OK, your previous post said "no R" so I thought it was completely dead.

I suspect you have an inoperative UD clutch. To get 1st gear, you need UD for the input, and either LR or the overrunning clutch (ORC) for the reaction. We know LR works (since Reverse is OK), so apparently UD is bad.

This could be a number of things (blown UD piston seal, defective UD solenoid, cut #1 check ball, broken UD shaft weld, broken rear sun gear, blown UD accumulator piston or seal, etc.). So we need to narrow things down. Any CEL or fault codes?
Sorry for the R thing on that post ,as u know from before the whole transmission new from a new 2012 truck done 21000Kmile , i ll check if there is code but no check engine light on dash
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Old 02-19-2014, 02:18 PM
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Sorry for the R thing on that post ,as u know from before the whole transmission new from a new 2012 truck done 21000Kmile , i ll check if there is code but no check engine light on dash
Note : while truck was driving on D it suddenly when pressed pedal didnt respond and became like N
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  #44  
Old 02-20-2014, 04:04 AM
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Dealer will order another valve body .......
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