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Message:: [QUOTE="kranky1, post: 12079197, member: 170538"]Check the filter in the back of the transmission. It’s that coolie hat looking thing on the shift solenoid at the back of the transmission. You only have to have the input pressure to that solenoid drop by 1psi or so before it won’t shift right. A small air leak down there will do the same thing. You should pre-select range and splitter shifts on newer Eatons. The old ones, up to the 15 series I think, weren’t supposed to be pre-selected. You made the range or splitter shift when the main was in neutral, that ####s the new ones up. As [USER=139725]@Judge[/USER] said the shift solenoid itself may be bad. Lots to check down around the back of the transmission before changing it. In the end there may be damaged synchros back there, but that’s only in the auxiliary section. Those can be replaced without pulling the whole transmission out of the truck.[/QUOTE]